Effect of neem on the development of cowpea weevil, Callosobruchus maculatus (Fabricius) on some leguminous seed
1987
Thawatsin, S.
The effects of bean seed varieties, namely; mungbean, bush bean and cowpea bean seeds and different dosages of neem leaf and seed kernel powder at laboratory conditions of 22-37 deg C, R.H. 98 percent with 14 percent moisture content on the development and growth index of C. maculatus were studied. Treatment of bean seeds at the rate of 0.5, 1.0, and 2.0 parts per 100 parts of the seed reduced oviposition capacity, lengthened larval and pupal period, reduced percent adult emergence, longevity and growth index. The cowpea bean seed was the most preferred food for development of this insect than bush bean and mungbean because this food source supported the normal development period and enhanced population growth. Relationship of the different parameters related to the development of C. maculatus revealed that number of eggs had strong positive bearing on percent adult emergence and growth index. But the total developmental period and percent adult emergence was observed to have an inversed relationship.
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