Uses: control of bacteria, fungi, and mycoplasma-like organisms. The majority of oxytetracycline is used on pears. Other crops treated include peaches, nectarines, and apples. Oxytetracycline use on apples has been approved under emergency exemption (Section 18) for several years due to the lack of efficacious alternatives. also registered for use on forest trees and ornamental trees, shrubs, and vines. Oxytetracycline is also registered with FDA to treat infectious diseases in animals and humans and also as a food additive to increase animal weight gain.