Insecticide residues in tuber crops and its effect on soil microbes
Abstract
Sucking pests are one of the most important problems in tuber crop cultivation. For the managementof sucking pests’ whitefly, mealybug, scale etc., systemic insecticides like imidacloprid and dimethoateare recommended for drenching and spraying. In the present study, these insecticides were tested fortheir impact on soil micro-organisms and for their presence in cassava.Beneficial soil microbes Bacilluscereus, Beauveria bassiana and Trichoderma spp. were isolated from rhizosphere soil of tuber crops and theirgrowth in insecticide applied media were compared. Residue analysis of the plant samples (cassava leavesand tubers) was conducted after the application of insecticides at recommended doses to the plants.Observations were taken after 1, 7, 14 and 30 days of application. From the LC-MS and GC-MS study,it was found that tuber (edible part) is safe from imidacloprid residue even 24 h after the application.But, 0.051 ppm dimethoate residue was noticed in cassava tubers after 30 days of drenching with theinsecticide.
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