STUDIES ON BIOECOLOGY AND MANAGEMENT OF GROUNDNUT POD BUG (Elasmolomus sordidus F.) (Hemiptera : Lygaeidae)
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Date
1999
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University of Agricultural Sciences, Dharwad
Abstract
The bioecology and management of groundnut pod bug (Elasmolomus sordidus)
was conducted in field and laboratory at Laxmeshwar and University of Agricultural
Sciences, Dharwad, respectively during 1997-98.
The population of pod bug in groundnut ecosystem fluctuated between 3.10 to
12.31 per 78.53 sq.cm. Maximum of 30.22 per 78.53 sq.cm was recorded in godown. In
addition to crop plants and perennial trees weed host Solanum nigrum was found to
harbour the pod bug throughout the year.
The average incubation and nymphal period encountered during the study were
7 89, 7.50, 7.32 days and 30.71, 30.53, 27.38 days on groundnut, sunflower and
sesamum, respectively. The adult longevity recorded was 15.49, 15.25 and 13.33 days
wrth a fecundity rate of 15.4, 15.2, 13.2 on these respective produce.
Earwig (Labidura sp.) and cricket (Gryllus sp.) were two predators recorded on
pod bug with the maximum population upto 9.00 per half kg of litter and 2.33 per square
metre, respectively. Earwig consumed 24.26 eggs and 3.09 adults per day. A similar
trend was also noticed in the predatory behaviour of cricket.
Sesamum (E-8) was preferred over sunflower by recording maximum bug
congregation of 28.54 for 10 days exposure period. Sesamum recorded significantly
higher loss of weight and oil content in 30 days exposure compared to sunflower under
free choice condition.
A study on field and storage loss revealed that stack and store treated with
chemical could reduce the pod damage upto 46.24 per cent. The stack treated pods
recorded minimum oil reduction (7.45%) as compared stack untreated pods (23.09%).
There was no significant differences among groundnut entries screened against
pod bug damage. Chlorpyriphos and malathion dust were found superior in the
management of pod bug causing mortality upto 90 per cent. Soil treatment with
chlorpyriphos and heap treatment with botanicals or chemicals resulted better control
over heap treatment alone.
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No . of references 40