Abstract
Susceptibility of three biological control agents of Brinjal insect pests to seven selected insecticides were evaluated. Lowest mortality (6.67 %) of Camponotus compressus was found in Bactoil and Nimbicidene 0.03 EC treated brinjal and the highest mortality (100%) was recorded from Necstar-50 EC and Booster-10 EC treatments. The lowest mortality of Micraspis crocera Muls was recorded from Bactoil (3.67%) treatment while the highest mortality of Micraspis crocera Muls was found in Necstar-50 EC (100.00%) and Booster-10 EC (100.00%) treated brinjal. In case of Trathala emergence from infested shoot, the highest percentage (22.22%) was observed in the untreated control plots and lowest emergence was in Necstar-50 EC (2.22%) and Proclaim-5 SG (3.33%) treated brinjal shoots. In case of the infested fruit specimen, the highest (22.22%). Trathala emergence was found in the untreated control plots followed by the plots treated with Bactoil (18.89 %) and Nimbicidene 0.03 EC (17.78 %) while the lowest was in Necstar-50 EC (1.11%) and Booster-10 EC (2.22 %) treated brinjal fruits. Compatibility factor was highest for Bactoil (13.94, 25.33 and 27.92 with C. compressus, M. crocera and Trathala, respectively) and was lowest for Booster-10 EC (0.86, 0.86 and 4.30 with C. compressus, M. crocera and Trathala, respectively). Therefore Bactoil, Nimbicidene 0.03 EC and Tracer-45 SC were found to be the most compatible insecticides for controlling the Brinjal shoot and fruit boruss.Jahangirnagar University J. Biol. Sci. 6(2): 75-81, 2017 (December)
Highlights
Predators of five different orders such as Coleoptera, Neuroptera, Diptera, Hymenoptera and Mantoidea were reported to be found in brinjal ecosystem (El-shafie 2001)
For controlling insect pests of brinjal, farmers usually spray different kinds of chemical insecticides during the crop season, which kill natural enemies and lead to the resurgence of target pest and outbreak of secondary pests, resistance biotype development, environmental pollution and health hazards (Pedigo, 2002). It leads to the development of the pesticides resistance of the target pests
It is evident from the data that the mortality of C. compressus were 90%, 80%, 23.33%, 6.67%, 6.67%, 0%, 0% for 24 hours and 100%, 100%, 92.59%, 20.74%, 13.70%, 6.67%, 6.67% for 48 hours of exposure to Necstar-50 EC, Booster-10 EC, Proclaim-5 SG, Helicide, Tracer-45 SC, Bactoil, Nimbicidene 0.03 EC, respectively
Summary
Predators of five different orders such as Coleoptera, Neuroptera, Diptera, Hymenoptera and Mantoidea were reported to be found in brinjal ecosystem (El-shafie 2001).
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