Ecofriendly management of Pseudodendrothrips mori Niwa and its impact on abundance of predatory coccinellids in mulberry ecosystem
Authors
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Regional Sericultural Research Station, Central Silk Board, Government of India, Allikkuttai (Post), Salem – 636017, Tamil Nadu ,IN
N. Sakthivel
DOI:
https://doi.org/10.18311/jbc/2019/23178Keywords:
Mulberry thrips, neem oil, pongamia oil, predatory coccinellids, Pseudodendrothrips mori, water jettingAbstract
Efficacy of neem oil, pongamia oil, spray of strong jet of water, and the recommended pesticide, dichlorovos (76 EC) when compared to the untreated control against the thrips, Pseudodendrothrips mori Niwa (Thysanoptera: Thripidae) infesting mulberry as well as their bio-safety to the predatory coccinellids were studied under field conditions. Two numbers of sprays were effected, i.e., first at 10 Days After Pruning (DAP) of mulberry garden and second at 20 DAP with the treatments asT1=Two sprays of neem oil, T2=Two sprays of pongamia oil, T3=Neem oil followed by pongamia oil, T4=Pongamia oil followed by neem oil, T5=Neem oil followed by water jetting, T6=Pongamia oil followed by water jetting, T7=Two numbers of water jetting, T8=Dichlorovos followed by water jetting, T9=Two spray of Dichlorovos and T10=Untreated Control. The population of thrips and predatory coccinellids were recorded one day prior to each spray and @ 1, 3, 7 and 10 days after each spray up to 30 DAP. The mean values revealed that highest reduction in thrips population (84.35%) was recorded with two numbers of water jetting (T7) and next best treatments were T8 dichlorovos followed by water jetting (75.17%) and T5 neem oil followed by water jetting (67.02%). With respect to the abundance of predatory coccinellids highest population (6.83) was recorded in the plots treated two times with water jetting, spray of pongamia oil followed by water jetting (4.82) and neem oil followed by water jetting (4.31), whereas least population was recorded with two sprays of dichlorovos (1.04). Among the various treatments, two sprays of forcible jet of water (water jetting) in 10 days interval were found superior in reducing the population of thrips and to conserve the predatory coccinellids in mulberry ecosystem.
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