Bio-rational management of insect pests infesting black gram [Vigna mungo (L.) Hepper]
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Date
2019-07-01
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MPUT, UDAIPUR
Abstract
Investigation on “Bio-rational management of insect pests infesting black gram
[Vigna mungo (L.) Hepper]” was carried out in the department of Entomology, Rajasthan
College of Agriculture, MPUAT, Udaipur during Kharif, 2018 with the objective of seasonal
incidence of insect pests and bio-efficacy of bio-rational insecticides against insect pests
infesting black gram.
The major insect pests were aphid, Aphis craccivora (Koch); jassid, Empoasca kerri
(Pruthi); whitefly, Bemisia tabaci (Gennadius); thrips, Caliothrips indicus (Bagnall); blister
beetle, Mylabris pustulata (Thunberg) and pod borer, Helicoverpa armigera (Hubner). The
population of aphid (36.67/ 5plant), jassid (30.67/5 plant) and whitefly (35.67/5plant) were
attained peak during first week (31 SMW) of August; thrips (17.33/5plant) population in
second week (32 SMW) of August; blister beetle (4.67/5plant) and pod borer (11.67/5plant)
infestation reached its peak in last week (34 SMW) of August. The infestation of pods was
maximum in the last week of August. The population of aphid, jassid, whitefly and thrips
exhibited a non-significant positive correlation with temperature and while thrips exhibited
positive significant correlation. Aphid and jassid exhibited significant correlation with
relative humidity and rainfall. Pod borer exhibited significant positive correlation with
rainfall. Blister beetle exhibited positively significant correlation with temperature and
rainfall.
Among different treatments, spinosad 45 SC @ 50 g a.i/ha caused maximum
reduction in the population of aphid, jassid, thrips and whitefly. Next effective treatments
were emamectin benzoate 5 SG @ 12g a.i./ha and indoxacarb 14.5 SC a.i./ha. The indoxacarb
14.5 SC a.i./ha caused significant maximum reduction in the population of pod borer and
blister beetle. The highest seed yield of 5.3 q/ha was recorded in case of treatment indoxacarb
14.5 SC with highest B:C ratio of 1:1.52 followed by spinosad 45 SC
Description
Bio-rational management of insect pests infesting black gram
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Citation
Kumar V. And Swami H.