Studies on the biology of Callosobruchus chinensis (linn.) on different pulses and its management at medium altitude hills of Meghalaya
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Date
2009
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College of Post Graduate Studies in Agricultural Sciences, CAU-Imphal, Umiam
Abstract
An investigation was carried out on the biology of Callosobruchus chinensis (Linnaeus) on different pulses and its management in the laboratory of the Division of Entomology. ICAR Research Complex for North Eastern Hill (NEH) Region. Umlam. Meghalaya. The growth and development of C.chinensis was studied on nine different pulses and it was observed that there was highly significant difference between egg laying and adult emergence, longevity of the offspring and developmental period indicating difference in the suitability of different pulses on the growth and population build up of pulse beetle The most suitable hosts were found to be pigeon pea, cowpea, green gram and Kabuli chana where the adult emergence was higher compared to other pulses. French bean was found to be totally unsuitable for the growth as there was no adult emergence observed. The management of with different plant leaf powders revealed that among neem. lantana. melia. eupatorium and ageratum leaf powders, neem powder was found to be most effective in reducing egg laying, adult emergence and percent weight loss treated at the rate of 50g/kg green gram seeds. Lantana and eupatorium leaf powders were least effective. Among the oils, neem, mustard, sunflower and safflower oils at the rate of 5ml/kg seed was found to be most effective in the management of C.chinensis on green gram where no adult emergence was observed. Whereas adult emergence was observed in coconut. soybean and groundnut oil treated seeds at same rate of application Neem oil was found effective even at the lower dosage of 25ml/kg. Therefore, for the management of C chinensis, oils were more effective than the botanical powders. Any of the above mentioned oils could be used at the rate of 5m/1kg except neem oil which could be used even at 2.5 ml/kg. But oils are costlier than the powders and they are easily available. Therefore, powders of neem melia and ageratum leaves also could be used for the management of this beetle.