Bot canker can be controlled, but not eradicated, using the fungicide benomyl. This treatment requires application at two week intervals throughout the growing season and is quite expensive. If the disease is not widespread in the plantation, removal and disposal of infected trees by burning should be considered. Other foliage diseases can also be controlled with benomyl applications. Bag worms have been observed on Leyland cypress.
Control involves removal of cases and application of an appropriate insecticide.
Spider mites may also infest trees causing mottled off-colored foliage. Infestations can be controlled with insecticides. Pesticide Precautions 1. Observe all directions, restrictions and precautions on pesticide labels. It is dangerous, wasteful and illegal to do otherwise.