MANAGEMENT OF PULSE BEETLE CALLOSOBRUCHUS MACULATUS FABRICIUS INFESTING STORED GREEN GRAM
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Date
2004
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AAU, Anand
Abstract
The study on effect on seed germination indicates that the per cent loss in germination increased with increase in duration of storage and incidence of the pulse beetle Callosobruchus maculatus infestation and nearly 100 per cent germination loss occurred within 120 days of storage. As a result of pulse beetle infestation, quality of the pulse also changed. The increase in nitrogen content and subsequently protein content of infested grains is attributed to the selective feeding of grub on endosperm leaving the seed coat intact which contains higher protein as compared to endosperm and also because of presence of uric acid, insect fragments, exuviae cast etc. and respiration loss of carbohydrate which reach upto 61.14 per cent within 120 days of storage as compared to initial (23.67 %). Free fatty acid was initially low which increased with increasing of storage period and reached upto nine folds within 120 days of storage period Among the different oils tested against the pulse beetles C. macualtus, coconut oil, groundnut oil and castor oil @ 6 ml/kg seed proved to be effective upto six months of storage whereas mustard oil gave good protection @ 6 ml/kg seed upto four months of storage period. The adverse effect of oils @ 4 ml and 6 ml/kg seeds on germination was recorded one week after treatments. The different varieties of mung bean were screened to identify resistant variety against C. maculatiis. Varieties GM - 4, GM- 9609, GM-9815 and GM - 9601 proved to be relatively more resistant against pulse beetle C. maculatus among seven varieties screened. The effect of various physico-chemical properties of mungbean varieties on the oviposition preference and adult emergence of C. maculatus were studied. It was observed that variety having high protein content was preferred less for oviposition and adult emergence. There was no correlation with weight and volume of seed on oviposition and adult emergence.
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AGRICULTURAL ENTOMOLOGY, AGRICULTURE, MANAGEMENT