Effect of Systemic Insecticides Applied Via Drench on the Mortality of on Curry Leaf

Huanglongbing (HLB), the most serious disease in citriculture, is caused by the bacteria Liberibacter spp., which is transmitted by the Asian citrus psyllid (ACP) . HLB is mainly controlled with insecticides, necessitating the development of alternative methods, e.g., the use of trap plants such as curry leaf , which is highly attractive to the ACP. We evaluated the effects of the main systemic insecticides used by citrus growers, applied via drench to adults of on the curry leaf tree. We tested the persistence of three pesticides: thiamethoxam, thiamethoxam + chlorantraniliprole, and imidacloprid in protected cultivation and the field condition at 7, 14, 28, 42, 56, 70, 98, and 154 days after the application. Different concentrations of insecticides containing the active ingredient thiamethoxam were tested on adults to determine the LC and LC. Finally, we assessed the sublethal effects on the oviposition and development of . The insecticides controlled the adults for long periods. However, in the field experiment, from 42 days after application there was a decrease in mortality caused by pesticides applied via drench, while in the protected cultivation, mortality did not decline until the last day of evaluation. The median lethal concentration (LC) for thiamethoxam was 0.031 g of active ingredient per plant, and for thiamethoxam in a mixture, the LC was 0.028 g a.i. per plant. In the experiment with sublethal doses, did not oviposit on the treated plants. Our findings suggest that the attract-and-kill system using the curry leaf tree and systemic insecticides is effective for the control of and contributes to the integrated management of HLB.