STUDIES ON INSECT PESTS OF TAMARIND, Tamarindus indica L. WITH SPECIAL REFERENCE TO TEA MOSQUITO BUG, Helopeltis antonii Sign. (MIRIDAE: HEMIPTERA)
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Date
2021-12-21
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University of Agricultural Sciences, Bangalore
Abstract
The insect pest succession studies on tamarind, Tamarindus indica L. revealed that the occurrence of 14 species of insect pests viz., tea mosquito bug, fruit borers, scale insects, mealy bugs, myllocerus weevil, root grubs, thrips and bag worms. Among these, tea mosquito bug, Helopeltis antonii Sign. fruit borer, Cryptophlebia ombrodelta (Lower) and scale insect, Aonidiella orientalis (Newstead) were considered as major pests on tamarind. Roving survey on seasonal incidence and per cent damage of tea mosquito bug, H. antonii on tamarind at different growing areas revealed that the incidence of tea mosquito bug started from August to January and reaches its peak during October with an average population of 15.46 / 5 sweeps at KVK, Chintamani with an infestation varied from 1.72 - 27.90%, July to January at Seekal village and maximum incidence was noticed during October 14.15 / 5 sweeps with per cent damage of 1.03 - 19.91%, June to January at Gundlapalli village with peak population of 15.15 / 5 sweeps during October with damage of 1.72 - 29.87%, July to February at Holur and Uttanur village with per cent damage of 0.97 - 30.49% and 0.99 - 29.89% respectively, bio efficacy of insecticides against H. antonii reveals that the application of fipronil 5% SC (2 mL/L) was most effective in reduction of tea mosquito bug. When incremental benefit cost ratio was considered, among different combinations of treatments first best treatment is profenofos 50% EC (2 mL/L) with an IBC ratio of 1:9.1. December, 2021