(Beyond Pesticides, January 18, 2017) Despite science affirming its hazards, the U.S. Environmental Protection Agency (EPA) has expanded the registration of the toxic herbicide mixture, Enlist Duo, which contains 2,4-D and glyphosate, for use on genetically engineered (GE) cotton and extended its use on GE corn, soybean, and cotton from 15 to 34 states. This approval late last week comes at a time when widespread chemical use is threatening public health and the environment and weed resistance continues to grow, threatening farmers’ productivity and profitability. Over 600 public comments were submitted to EPA on this issue, with many comments vehemently opposing the current uses and the proposed expansion of uses. In its decision, EPA stated that Enlist Duo “meets the safety standard for the public, agricultural workers, and non-target plants and animal species.” However, as Beyond Pesticides stated in comments to the agency, EPA has not fully considered all the environmental costs, including the cost of tackling increased 2,4-D resistant weeds, crop and non-target damages from uncontrolled drift, as well as unanswered questions regarding synergistic chemical effects in non-plant species. Advocates predict weed resistance to Enlist Duo and have urged EPA to reject its continued use and incentive sustainable organic practices. Additionally, […]

(Beyond Pesticides, January 17, 2017) On January 12, 2017, the U.S. Environmental Protection Agency (EPA) released major risk assessment documents on  pollinator exposure to bee-toxic neonicotinoid insecticides finding no significant risks, despite the large and growing body of science identifying the pesticides’ hazards. In the documents, EPA identifies risks posed to bees by several neonicotinoid insecticides, but suggests that no restriction on uses are imminent. In another decision meant to protect bees from acutely toxic pesticides, the agency is scaling back its original proposal in deference chemical-intensive agricultural interests. EPA’s long awaited pollinator assessments for the neonicotinoids: clothianidin, thiamethoxam, and dinotefuran, much like the 2016 pollinator assessment release for imidacloprid, identifies risks to bees from the agricultural applications (foliar, soil and seed) of these chemicals, including from pesticide drift. Observed effects include decline in worker bees, and subsequent declines in brood and pollen stores in the colony. EPA‘s assessments continue to focus on honey bees, with cursory mention of wild, native bees. Once again, the assessments did not consider risks from exposures to contaminated water, guttation droplets, or soil, with EPA stating that, “The Agency lacks information to understand the relative importance of these other routes of exposures and/or to quantify potential risks […]

(Beyond Pesticides, January 13, 2016) Just prior to the U.S. Environmental Protection Agency (EPA) announcement on January 12 that several neonicotinoid insecticides “do not pose significant risks to bee colonies,” the preprint version of a new review of neonics identified the range of lethal and sublethal effects of the chemicals on non-target organisms.  The review, The Environmental Risks of Neonicotinoid Pesticides: a review of the evidence post-2013, authored by Dave Goulson, PhD, and Thomas James Wood, a PhD candidate, concludes that studies published since the 2013 European Food Safety (EFSA) published risk assessments show even greater risks. The EFSA assessment, which led to a moratorium on neonicotinoid uses, found that certain neonics on specific flowering crops pose a high risk to bees. With reference to the 2013 EFSA risk assessment conclusions as their baseline, the researchers summarize the difference in risk for certain categories, including: “Risk of exposure from and uptake of neonicotinoids in non-crop plants. Uptake of neonicotinoids by non-target plants was considered likely to be negligible, though a data gap was identified. Many studies have since been published demonstrating extensive uptake of neonicotinoids and their presence in the pollen, nectar and foliage of wild plants. Exposure from non-target plants clearly represents a Greater […]

(Beyond Pesticides, January 12, 2017) Yesterday marked a monumental event in the fight against pollinator declines, as the rusty patched bumblebee became the first bee species to officially be declared endangered by the U.S. Fish and Wildlife Service (FWS). According to FWS, endangered species designations are made when a species is “in danger of becoming extinct throughout all or a portion of their range.” Tom Melius, Service Midwest Regional Director for FWS, stated in a press release that, when it comes to this determination, “[FWS’s] top priority is to act quickly to prevent extinction of the rusty patched bumble bee. Listing the bee as endangered will help [the agency] mobilize partners and focus resources on finding ways right now to stop the decline.” Listed yesterday in the Federal Register, the ruling will go into effect February 10, 2017. This is a victory for environmental groups who have fought to protect the rusty patched bumble bee from widespread threats, such as habitat loss and pesticide use. According to FWS, the rusty patched bumble bee was once widespread across the United States and parts of Canada, but declined dramatically in the 1990s.  Since then, their populations have dwindled and their overall decline is estimated at 91 […]

(Beyond Pesticides, January 11, 2017) Ultra-low doses of glyphosate formulations fed to rats is linked to an increased likelihood of developing non-alcoholic fatty liver disease (NAFLD), according to a recently published study in the journal Nature. A lead author of the study, Michael Antoniou, PhD, stated that the findings are “very worrying as they demonstrate for the first time a causative link between an environmentally relevant level of Roundup consumption over the long-term and a serious disease.” The findings point to the growing need to eliminate the widespread use of this herbicide, as it has already been implicated in endocrine disruption, reproductive effects, and kidney and liver damage. The researchers analyzed female rat livers obtained from a previous 2-year study on Roundup toxicity using molecular profiling techniques. These rats were administered Roundup via drinking water at a concentration of 0.1 ppb, which is an allowable level within both the U.S. and the European Union. The molecular analyses conducted by researchers on the internal organs of the rats fed Roundup included testing of liver cell disturbances. Overall, ultra-low dose glyphosate-formulation exposure led to observations of biomarkers also seen in fatty liver disease. These findings have human health implications “since NAFLD is predicted to be the […]

(Beyond Pesticides, January 10, 2017) Exposure to neonicotinoid (neonic) insecticides leads to a decrease in pollination frequency and fewer social interactions in bumblebees, according to research published by scientists from Harvard University and University of California, Davis. The study, released last year but presented this week at the Society for Integrative and Comparative Biology’s annual meeting, underscores the need for regulators and policy makers to eliminate use of these chemicals, not only to protect honey bees, but also wild pollinators like the bumblebee. While worker bumblebees (Bombus impatiens) divide their tasks within the colony in a similar manner to honey bees, their nests appear quite different than their more structured cousins. “Bumblebee nests are not the organized, beautiful geometry of the honeybee,” said James Crall, PhD candidate in Harvard’s Department of Organismic and Evolutionary Biology. Instead, “They’re more a hodge-podge of food and larvae in a pile in the middle of the nest space.” For their study, researchers placed four bumblebee colonies in a mesh enclosed area, tagged each bee, and observed them foraging on tomato flowers grown in a pollinator-excluding greenhouse (to ensure bees had freshly-opened flowers for pollination each day). After observing normal behavior, bees within each colony […]

(Beyond Pesticides, January 6, 2017) When it comes to pollination, bees tend to get all of the buzz. While they are crucial to pollinating many crops, it is important to note that bees aren’t the only pollinators working hard to provide the ecosystem services we rely on to support our food system. In fact, one out of every three bites of food we take is made possible by pollinators. In order to raise awareness for the unsung pollinator heroes all around us, Beyond Pesticides created the Polli-NATION Campaign, which highlights the important work of a relatively unknown pollinator each month. With it, we will raise public awareness about these pollinators, their contribution to plant health and productivity and the preservation of natural resources, and the threats they face in their daily lives, including toxic pesticides and habitat loss. Polli-NATION members include species like butterflies, wasps, flies, beetles, birds, bats, and more. By taking the time to read about our featured Polli-NATION pollinator, you will not only learn about the many diverse species we call pollinators, but also discover what you can do in your daily life to help ensure their survival. Our pollinator of the month is the bee fly! […]

(Beyond Pesticides, January 5, 2017) Winegrowers in the Texas High Plains region are concerned that approval of new herbicides by the U.S. Environmental Protection Agency (EPA) will devastate their profitable industry due to chemical damage from pesticide drift. Wine producers in this region of Texas have witnessed chemical damage to their vineyards that they blame on the toxic herbicides, dicamba and 2,4-D, used on cereal crops and pastures on surrounding agricultural land. A new herbicide formulation containing dicamba, XtendiMax with VaporGrip Technology, was approved by EPA, and the agency has recently proposed to register and expand the use of Enlist Duo, a herbicide that contains 2,4-D. EPA’s final decision on registration of Enlist Duo is expected in early 2017. According to Paul Bonarrigo, owner of Messina Hof Winery in Texas, the “approval of these formulations will wind up affecting every vineyard up there.” This will have ramifications across Texas, as the wine industry contributed $1.88 billion to the state’s economy in 2013. Advocates say that the new herbicide formulations present unreasonable adverse risks to humans and the environment in addition to harming the livelihood of farmers. Following on these concerns, Garrett Irwin, owner of Cerro Santo vineyard, stated,“If we get […]

(Beyond Pesticides, January 3, 2017)  A study published in December 2016 in Environmental Contamination and Toxicology, entitled The Effect of Atrazine on Louisiana Gulf Coast Estuarine Phytoplankton, finds that phytoplankton in estuaries in close proximity to agricultural operations are less productive than phytoplankton in an uncontaminated environment. The study examines three different estuaries of the Mississippi river in Louisiana and also evaluates microcosms with different concentrations of atrazine. Phytoplankton, incredibly important to estuary ecosystems and aquatic life, are an integral part of the aquatic food web and ultimately critical to the wild seafood market. As photosynthetic microorganisms, phytoplankton harness the sun’s energy for metabolism and create as a byproduct of photosynthesis dissolved oxygen, which oxygen-breathing sea life require. For the study, the researchers created microcosms, or large containers that are able to closely mimic ecosystems, so that they can observe the effects of independent variables. On average, phytoplankton in the microcosms are less productive at producing chlorophyll a in the presence of atrazine. The microcosm study design is important because it is difficult to separate and measure the effects of chemicals like atrazine in the environment, given the range of potential causes of phytoplankton decline. A variety of factors, like freshwater discharge rates, precipitation, […]

(Beyond Pesticides, December 24, 2016) Beyond Pesticides thanks our members and supporters for being a part of a critical movement to advance sustainable and organic land and building management in 2016. As our Daily News takes a holiday break, returning Tuesday, January 3, 2017, we hope you will join us in reflecting on the progress made this year, and the critical challenges that lie ahead. The road ahead We are entering a period in our nation’s history with many serious concerns about the protection of public health and the environment. We have heard the President-elect’s rhetoric about the overreach of the Environmental Protection Agency (EPA), the burden of regulatory compliance, and the need to dismantle environmental programs. The nominee for EPA Administrator is on record as challenging science and the value of environmental protection. In contrast, we have learned over the last several decades that protection of the environment contributes to a productive economy and healthier people. Beyond Pesticides’ databases track the scientific literature on pesticide hazards and alternatives, which clearly document the value of healthy ecosystems in providing ecosystem services that translate to reduced costs for farmers and land managers. Whether we’re talking about bees and other pollinators or predator insects, […]

(Beyond Pesticides, December 23, 2016) The Environmental Agency (EPA) has finalized a proposal to ban 72 inert (or secret hazardous) ingredients from use in pesticide formulations following a long fight with environmentalists who, in 2006, asked that pesticide product labels disclose any of 371 inert ingredients that could be in products. While this finalization is a step in the right direction, ultimately the move is viewed by advocates as inadequate. The original petition, submitted by Northwest Coalition for Alternatives to Pesticides, along with Beyond Pesticides, Physicians for Social Responsibility, and nearly 20 other organizations, called on the agency to require disclosure of inerts. To put the announcement in perspective, EPA is acting on 72 inert ingredients that are no longer being used, such as turpentine oil, and nitrous oxide. An inert ingredient is defined as any ingredient that is “not active,” or specifically targeted to kill a pest. According to a 2000 report produced by the New York State Attorney General, The Secret Ingredients in Pesticides: Reducing the Risk, 72 percent of pesticide products available to consumers contain over 95 percent inert ingredients and fewer than 10 percent of pesticide products list any inert ingredients on their labels. The report also found […]

(Beyond Pesticides, December 21, 2016) A California Department of Pesticide Regulation (DPR) report of all pesticide related illnesses in the state in 2014 identifies 1,685 cases “potentially involving health effects from pesticide exposure,” combining exposures from agricultural and non-agricultural use. Of the 798 cases associated with non-agricultural use, 18% of them (146 cases) involved exposure in children under 18 years old. The exposure rates are alarming, and only strengthen efforts by local activists in counties like Tulare to protect children from pesticide exposure. According to the report, Tulare County has the highest number of reported illnesses related to pesticide exposure at 78, followed by Santa Cruz County with 67. The report, Summary of Results from the California Pesticide Illness Surveillance Program 2014, provides a summary of illnesses identified by the Pesticide Illness Surveillance Program (PISP), a program under DPR. Of the 1,685 cases potentially involving health effects from pesticide exposure reported, DPR epidemiologists determined that 1,073 of those cases were “at least possibly associated” with pesticide exposure, representing a 5% decrease from 2013. However, even though the number of associated cases decreased in 2014, PISP did see a 14% rise in the number of associated episodes, defined as “an event in which a single source […]

(Beyond Pesticides, December 20, 2016) A long-awaited and contentious scientific meeting convened by the U.S. Environmental Protection Agency (EPA) on the carcinogenic properties of glyphosate wrapped up its review last week, with the 15-member scientific advisory panel split on their determination,  and some considering a “suggestive evidence” classification. The panel’s charge was to evaluate EPA’s recent proposal that the widely used herbicide should be considered “not likely to be carcinogenic to humans,” despite a 2015 determination from the International Agency for Research on Cancer than glyphosate is “probably carcinogenic” with “sufficient evidence of carcinogenicity” based on laboratory studies.  The panel now has roughly three months to provide a final recommendation to the agency, which is likely to influence EPA’s final classification of the herbicide. The meeting was split into four days, with one and a half days committed to the panel receiving public comments. As veteran reporter Cary Gillam notes in The Huffington Post, representatives from Monsanto were allotted over three hours to provide evidence against a cancer determination, while public health advocates including Beyond Pesticides and allies were only allotted between 5-15 minutes to make their case. [Read Beyond Pesticides’ comments to the Glyphosate Review Panel here.] Monsanto, for its […]

(Beyond Pesticides, December 19, 2016) The U.S. Environmental Protection Agency (EPA) last week filed a complaint against a Syngenta research farm in Kauai, Hawaii for exposing a dozen agricultural workers to an unregistered insecticide on the farm in early 2016. Syngenta Seeds, LLC is facing over $4.8 million in fines from EPA for allegedly violating multiple federal pesticide regulations meant to protect agricultural workers. At the time of the incident, 19 agricultural workers went to work on fields freshly sprayed with the insecticide chlorpyrifos, an organophosphate insecticide. The incident with this highly neurotoxic chemical sent 10 workers to the hospital for medical treatment. EPA’s complaint states that Syngenta Hawaii LLC misused the pesticide “Lorsban Advanced” and that violated EPA’s worker protection standard. Due to its neurotoxicity, EPA banned chlorpyrifos for residential uses in 2000, but retained most agricultural use. EPA maintains that Syngenta failed to provide a waiting period for the workers to re-enter the fields. Additionally, Syngenta did not provide workers with personal protective equipment, as well as proper decontamination supplies once the exposure had occurred. At the time of the incident, an inspector from the Hawaii Department of Agriculture (HDOA) was present on the Syngenta farm, which triggered an immediate investigation from the […]

(Beyond Pestimcides,  December 14, 2016) Preliminary research presented this week at the British Ecological Society’s annual meeting identifies yet another troublesome connection between the use of neonicotinoid pesticides and the health of bees, a critical pollinator species. The research links neonicotinoid use with an impaired ability of bees to learn to vibrate flowers and shake out the pollen, which is necessary for fertilization in crops like tomatoes and potatoes. This research is consistent with other studies that link neonicotinoid use to reduced learning in bees, as well as other impacts such as those on their colony size and  reproduction, as well as contributions to overall declines. Neonicotinoids (neonics) pesticides are a relatively new class of chemicals that affect plants in a systemic way, moving through the plants vacular system and expressed through pollen, nectar, and guttation droplets.  These pesticides, :which include  imidacloprid, thiamethoxam and clothianidin, have been found by  a growing body of scientific literature  to be linked to Colony Collapse Disorder, a phenomenon where bees experience rapid declines from hive abandonment and bee die-off,  and  pollinator decline in general.  Neonics are associated with  decreased foraging  and navigational ability, as well as increased vulnerability to pathogens and parasites as a […]

(Beyond Pesticides, December 13, 2016) Net Loss, a new report released by the Center for Food Safety (CFS), indicates the use of neonicotinoid-coated seeds is exactly that, an economic drain for farmers that only results in the indiscriminate poisoning for non-target wildlife, such as pollinators. The report is a follow up to a 2014 report, Heavy Costs: Weighing the Value of Neonicotinoid Insecticides in Agriculture, which concluded  that neonic seeds bring greater costs than benefits to farmers. Later that year, a study published by the U.S. Environmental Protection Agency (EPA), which  looks specifically at the economic value of neonic coated soybeans, made similar determinations —insecticide seed coating provide little or no overall benefit in controlling insects or improving yield or quality. CFS’s new report cites  numerous new studies published over the past several years that reinforce the group’s original determination on the realized benefits pesticide-coated seeds provide to farmers. Front and center in the report are preliminary results from the European Union’s suspension on the use of neonics on certain agricultural crops. The report finds that after the 2013 EU moratorium, despite cries from the agrichemical industry of rampant crop failures, yields actually increased. For maize, the EU saw a […]

(Beyond Pesticides,  December 12, 2016)   On November 23, Bill Bader of  Bader farms, Missouri’s largest peach farm with over 1,000 acres and 110,000 peach trees, filed a suit against the multinational, agrichemical giant Monsanto. Mr. Bader seeks compensation for extensive damags to his peach trees, which he blames on the illegal, or non-labeled, use of the toxic herbicide dicamba, brought on by sales of Monsanto’s new, genetically engineered (GE), dicamba-tolerant crops. Mr. Bader is projected to lose $1.5 million in revenue from the crop damage. The case was filed in the Circuit Court of Dunklin County, an area that has been hit especially hard by alleged illegal dicamba spraying. The farm’s insurance company refuses to cover damages from any illegal herbicide use. Without compensation for the damages, the farm risks going out of business. The illegal use of dicamba in this case is not an isolated incident. There have been many disputes in the Midwest over the  illegal spraying of dicamba and subsequent crop damage due to pesticide drift.  Numerous news reports over the past two  months in southern soybean growing regions have found that many farmers are, in response to weeds on their farms that have become resistant […]

(Beyond Pesticides, December 5, 2016) People across the country can support farmworker children and rural communities by speaking up in support of better protection of California school children from pesticide exposure by December 9, 2016. Send a  short email to the California Department of Pesticide Regulation (DPR) ([email protected]) to tell the Department it  must expand proposed buffers around schools to one-mile to protect school children during and after school hours, and expand the rule to cover all schools and daycare centers. Given that, according to the California Department of Food and Agriculture’s latest statistics, “Over a third of the country’s vegetables and two-thirds of the country’s fruits and nuts [and a large share of dairy and livestock] are grown in California,” everyone who eats food in the U.S. has a stake in protecting children who live in the communities where the food is grown. Food purchasing decisions have a direct impact on the people who work on farms, their children, and the communities where they live. Support the more than 75 parents, teachers and advocates for social and environmental justice who marched in Tulare County to DPR’s draft rules for pesticides use near schools last week. Led by members of […]

(Beyond Pesticides, December 2, 2016) Last week, the Arkansas Plant Board voted 12-0 to push measures that would ban or limit the use of certain forms of the toxic herbicide dicamba in the state. The hearing was called to address proposals that the board released for public comment on September 30, such as banning certain formulations of dicamba outright, creating restrictions on the time of year that other formulations of the herbicide can be used, and creating buffer zones in certain situations. This decision comes on the heels of a newly registered formulation of dicamba by the Environmental Protection Agency (EPA), and widespread reports of crop damage across the Midwest and Southeast due to the illegal use of dicamba before it was registered. According to DTN Progressive Farmer, the three-hour public meeting was packed with almost 200 people, and approximately 20 of those testified. The testimonies highlighted the disputes and tensions that have arisen over the use of dicamba, as many remembered and spoke about Mike Wallace, a farmer who was tragically murdered on October 27 during an argument with a fellow farmer in Missouri over the illegal use of the chemical and subsequent crop damage. “We’ve seen exactly what […]

(Beyond Pesticides, November 29, 2016) Last week, Health Canada announced its intent to cancel nearly all uses of the neonicotinoid insecticide imidacloprid after determining that the chemical poses unacceptable risks to the environment. Although imidacloprid and other pesticides in the neonicotinoid chemical class are  notorious for their harmful impact to pollinators, Health Canada’s decision to eliminate most uses of the chemical is based primarily on the danger it poses to aquatic insects. Environmental groups throughout the world are praising the proposal, but cautioning against the long, three to five year phase out period proposed by the agency. There is concern that the phase out  will permit continued environmental damage, and provide time for other toxic insecticides with similar systemic properties to replace imidacloprid. Advocates are urging U.S. Environmental Protection Agency (EPA) to complete its full assessment of imidacloprid and follow Canada’s lead in eliminating this toxic chemical. Imidacloprid  breaks down slowly in the environment and has a strong propensity to move through soil and into ground and surface water. Health Canada indicates that water quality monitoring data frequently detects the chemical in waterways at levels that poses unacceptable risks to aquatic insects. The agency was unable to attribute the source […]

(Beyond Pesticides,  November 28, 2016) Last week, a  federal judge effectively  rubber stamped  U.S. Environmental Protection Agency (EPA) policies that allow seeds to be coated with bee-toxic pesticides known as neonicotinoids. These pesticides, persistent in water and soil, are associated with acute bee kills, widespread pollinator declines and environmental damage. The Judge’s Order was issued on Nov. 21 in the case of  Anderson et al. v. McCarthy, No. 3:16-cv-00068-WHA (N.D. Cal.). “It is astounding that a judge, EPA or anyone with any common sense would not regulate this type of toxic pesticide use, especially when the seed-coatings are so broadly applied and there is so much at risk. Study after study has shown that seeds coated with these chemicals are a major culprit in catastrophic bee-kills. Now more than ever our country’s beekeepers, environment and food system deserve protection from agrichemical interests, and it is EPA’s job to deliver it,” said Andrew Kimbrell, Director of Center for Food Safety. The neonicotinoids share a common mode of action that affects the central nervous system of insects, resulting in  paralysis and death. They include  imidacloprid, acetamiprid, clothianidin, dinotefuran, nithiazine, thiacloprid and thiamethoxam. Neonicotinoid pesticides have  consistently been implicated  as a key contributor […]

(Beyond Pesticides, November 23, 2016)  With Thanksgiving just a day away, there is no better time to think about how we can more effectively join together as families and communities across divisions and different points of view to find a common purpose in protecting human health and the environment. Thanksgiving meals are commonly made with conventional agricultural products, which include a plethora of pesticides and genetically engineered (GE) ingredients that can affect  the health of consumers and agricultural workers alike. Read below to find out how you can combat the shortcomings of conventional agriculture with an organic Thanksgiving Day feast. Now, more than ever, it’s important to support organic and continue to demand agricultural practices that are protective of human and environmental health. According to GMO Inside, some common foods with GE ingredients purchased during Thanksgiving include: Campbell’s Tomato Soup, Wesson Canola Oil, Bruce’s Canned Yams, Hershey Milk Chocolate, Pepperidge Farm Crackers, Kraft Classic Ranch Dressing, Rice-a-Roni chicken flavored rice, Ocean Spray Cranberry Sauce, and Kraft’s Stove Top Stuffing. Glyphosate, produced and sold as Roundup by Monsanto, is the most commonly used chemical in the U.S., primarily as a weedkiller in chemical-intensive agriculture. Glyphosate has been  found to cause changes […]

(Beyond Pesticides, November 21, 2016) The potential benefits of “weeds” have long been ignored, but a new study attempts to quantify the benefits of all species within an agricultural system, including the undesirable ones. The study, Integrating Insect, Resistance, and Floral Resource Management in Weed Control Decision-Making, by Cornell University scientists, assesses and updates holistic integrated pest management practices. In a discussion with the Cornell Chronicle, lead author of the study, Antonio DiTommaso, Ph.D., states, “Managing crop pests without fully understanding the impacts of tactics —related to resistance and nontarget plants or insects— costs producers money.” The authors introduced a weed management decision framework that accounts for weed benefits and illustrates that by allowing low levels of weeds in a cropping system, a farmer can increase crop yields and provide numerous ecosystem services. In a case study of an herbicide-tolerant corn cropping system, which had been controlled primarily with glyphosate,  the authors demonstrated that the European corn borer (ECB) could be reduced  through holistic management decision making. The  data suggest that, “Milkweed plants harboring aphids provide a food source (honeydew) for parasitoid wasps, which attack ECB eggs.” By maintaining low densities of milkweed in the corn field, farmers allow beneficial […]