Seasonal Incidence and Management of Major Insect Pests of Glycine max (L.) Merril
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Date
2018
Authors
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Journal ISSN
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Publisher
MPUAT, Udaipur
Abstract
Seasonal Incidence and Management of Major Insect Pests of
Glycine max (L) Merril
Sonkamble. M.M Dr. B.S.
Rana The present investigation on Seasonal Incidence and Management of Major Insect
Pests of Glycine max (L) Merril was at Instructional farm and in the Department
of Entomology, Rajasthan College of Agriculture, Udaipur (Raj.) for two crop
seasons i.e., Kharif 2014 and 2015, with the following objectives of recording
the population dynamics of important insect pests of soybean in relation to
weather parameters, studying the field life-tables and key mortality factors of
important lepidopterous pests of soybean and the bio-efficacy of newer
insecticides and neem derivatives against major insect pests of soybean
Jassids, whitefly, tobacco caterpillar and semilooper were recorded as major insect
pests on soybean during both the seasons. Infestation of jassids and white fly
initiated in the month of July and that of semilooper and tobacco caterpillar
initiated in the month of August and the major insect pests reached their peak
mean populations during August-September each year.
Life table studies of tobacco caterpillar and semilooper on soybean revealed that
the mortality in egg stages during both the year kharif 2014 and 2015 was due to
infertility, unviability and unknown reasons and infertility in eggs respectively.
The mortality factors in younger larvae (I to III instar) of tobacco caterpillar and
semilooper during 2014 and 2015 was due to Braconids and parasitisation
respectively. The cumulative mortality factors in larvae from IV to VI instars of
tobacco caterpillar and semilooper during both the years 2014 and 2015 was due
to N. rileyi, unknown reasons, tachinid fly, disease, dispersion, predation.
The first and second spray of Triazophos 40 E.C @ 1.6 ml/lit recorded
significantly maximum reduction of jassid and white fly at 3,7 and 14 days
respectively during both the years kharif 2014 and 2015. It was followed by
emamectin benzoate 5 SG. The first and second spray of Spinosad 45 SC @ 0.4
ml/lit recorded significantly maximum reduction of semilooper and tobacco
caterpillar at 3,7 and 14 days respectively during both the years kharif 2014 and
2015. It was followed by chlorantraniprole 18.5 EC.
Description
Seasonal Incidence and Management of Major Insect Pests
Keywords
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Citation
Munjajirao. S.M, And Rana. B.S.