INSECT PEST COMPLEX, SCREENING OF VARIETIES AND MANAGEMENT OF SUCKING PESTS IN FRENCH BEAN (Phaseolus vulgaris L.)
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Date
2020-10-09
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University of Agricultural & Horticultural Sciences, Shivamogga
Abstract
The present investigation was carried out on ‘Insect pest complex, screening of varieties and management of sucking pests in french bean (Phaseolus vulgaris L.)’ under field conditions at KrishiVigyana Kendra (KVK) farm, University of Agricultural and Horticultural Sciences (UAHS), Shivamogga during 2019-2020. During the study period, different pests were observed viz., leafhopper, Empoascafabae (Harris); aphid, Aphis craccivora(Koch); mite, Tetranychusmacfarlanei(Baker and Pritchard); bean pod borer, Marucavitrata (Fabricius); bean leaf webber, Omoidesindicata(Fabricius); pod bug, Riptortuslinearis (Fabricius) and green bug, Nezaraviridula (Linnaeus). The natural enemies were spiders and different species of ladybirdbeetles like Propyleadissecta (Mulsant), Coccinellatransversalis (Fabricius), Harmoniaoctomaculata (Fabricius), Coelophorabissellata (Mulsant) and Cheilomenessexmaculata (Fabricius) were recorded on french bean in both Kharif and Rabi seasons.Whereas, thrips, Megalurothripsusitatus(Bagnal); whitefly, Bemisiatabaci(Gennadius) and bean stem fly, Ophiomyiaphaseoli (Tryon) were observed in Rabiseason only. A total of nine french bean varieties were screened against sucking pests, among them ArkaSuvidha recorded the least population (3.07 per three leaves) of leafhoppers, aphids (34.13 per three leaves) and mites (8.16 per leaf), while least leafhoppers (3.71 per three leaves) and mites (6.21 per leaf) were recorded on ArkaArjunand ArkaAnoop, respectively. The efficacy of different insecticides against sucking pests showed that dinotefuran 20 SG (0.4 g/l) found highly effective in reducing leafhoppers followed by flonicamid 50 WG (0.5 g/l) whereas, flonicamid 50 WG(0.5 g/l)effective in suppressing aphids followed by pymetrozine 50 WG(0.6 g/l). The significantly higher yield of 9.88 t/ha was obtained in flonicamid(0.5 g/l) treated plot being statistically on par with dinotefuran(9.21 t/ha) and pymetrozine (8.49 t/ha). The higher cost-benefitratio of 1:3.83 was obtained from flonicamid followed by dinotefuran (1:3.73) and pymetrozine(1:3.30). However, the untreated control registered lowest cost-benefit ratio (1:1.30).