Asian citrus psyllid suppression from IPM programs and response to commonly used insecticides

Pesticides have been widely used to control Asian citrus psyllid (ACP) population and cases of resistance for some insecticides have already been reported. To improve the control of this economically important pest on citrus orchards in US and decrease the risk of resistance, we evaluated four Integrated Pest Management (IPM) programs. In all the programs the ACP population was controlled just when the density was 0.1 individuals for samples or more. We checked the lethal effect of pesticides used in each program confining 10 ACP adults per cage, 12 repetitions, before spray and we evaluated the mortality 24 and 96 hours after the pulverization. After 24 h, Pyganic, horticultural mineral oil (HMO), Danitol, and Delegate killed 58, 54, 93, and 100% of ACP, respectively, while after 96 h the mortality increased to 90, 86, and 100% in the Pyganic, HMO, and Danitol treatments. In the control the mortality was 5%. Colonies of ACP from each program was establish in green house and dose-response was studied on the first generation. We evaluated three insecticides: dimethoate, fenpropathrin, and imidacloprid. Individuals from the laboratory colony kept for more than 10 years showed be more sensible for the pesticides than the ACP from the programs. However, it was not observed significant sensibility between the programs which show the importance of the use of pesticides only when it is needed to avoid select individuals resistant.