Laboratory Evaluation of Selected Differential Chemistry Synthetic Insecticides against some Economically Important Insect Pests

Abstract

I nsect pests have always been a ubiquitous threat to global food production. These invertebrates cause untold qualitative and quantitative damage to various agricultural and horticultural crops all over the world including India and Pakistan (Arif et al., 2018; Gun-dappa and Shukla, 2018). Almost all field and forage, fruit and vegetable and forest and ornamental crops are attacked by different sucking and chewing insect pests. For instance, mango mealybug (Drosicha mangiferae Green), mango leafhopper (Idioscopus clypealis Lethierry), Asian citrus psyllid (Diaphorina citri Kuwayama) and subterranean termites (Odontotermes Abstract | Contemporary non-target effects of conventional synthetic insecticides necessitate evaluating biorational insecticides owing differential chemistry and modes of action than the conventional ones. This laboratory study comparatively evaluated some selected differential chemistry insecticides against some destructive and economically important insect pests i.e. mango mealybug (Drosicha mangiferae Green), mango leafhopper (Idioscopus clypealis Lethierry), Asian citrus psyllid (Diaphorina citri Kuwayama) and subterranean termites (Odontotermes obesus Rambur). Standard twig-and filter paper-dip bioassay methods were used against sap-feeding pests and termites, respectively. Factorial analyses of variance revealed a significant impact of tested insecticidal formulations and exposure time on the mortality all insect pest individuals. The most effective differential chemistry insecticides against mango leafhopper, citrus psyllids, mango mealybugs and subterranean termites were nitenpyram, clothianidin, thiamethoxam and imidacloprid (causing 74-79% cumulative corrected mortality), thiamethoxam, imidacloprid, clothianidin and spirotetramat (causing 78-85% cumulative mortality), spirotetramat, acetamiprid and thiamethoxam (causing 68-90% cumulative mortality), and chlorantraniliprole, pyriproxyfen and chlorfenapyr (causing 80-85% cumulative mortality), respectively. Overall study findings suggest these above mentioned non-conventional insecticides to be incorporated in the biorational management of these insect pests.

Chitosan-Delivered Chlorantraniliprole for Pest Control: Preparation Optimization, Deposition Behavior, and Application Potential

“…To the best of our knowledge, there are few reports related to the controlling of mealybug pests using the formulations of pesticide CAP. Control effects of some insecticides against the third or second instar nymphs of mango mealybug Drosicha mangiferae­(Green) were once evaluated. , They found that the selected suspension concentrate of CAP did not show contact toxicity and effective control to Drosicha mangiferae. Different from the mango Drosicha mangiferae, a high reduction rate of pest population (90%) was observed on the ninth day after the first pesticide treatment in our present work, which may be attributed to the combined results of both contact toxicity and stomach toxicity.…”