Timing and extent of damage caused by insect pests of green gram (Vigna radiata L.) in Bangladesh |
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| Authors: | W Islam KN Ahmed OI Joarder |
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| Institution: | Bangladesh Council of Scientific and Industrial Research Laboratories, Rajshahi, Bangladesh |
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| Abstract: | The occurrence and abundance of green gram pests were studied during the crop season of 1982. There were six Lepidoptera, four Coleoptera, two Hemiptera, two Orthoptera and one Diptera, of which the Lepidopteran Spilosoma obliqua Walk. was the most serious. Thysanoplusia orichalcea Fabr., Spodoptera litura Fabr. and Apogonia spp. were abundant during September and October, whereas S. obliqua and Ophiomyia phaseoli Coq. were represented most in October. Etiella zinckenella Treit. was abundant during the middle of October to the second week of November. Larvae of all instars of all six Lepidopteran pests were collected in the field, except for T. orichalcea and Manduca spp. with larvae of only the third and fifth instars. No larvae were found in the field of other orders of insect pests, except O.phaseoli and Epilachna dodecastigma Muls. The fifth- and sixth-instar larvae consumed more leaf material than did those of the first four instars. Larval damage potential in terms of leaf area consumed was greatest in Manduca spp. and lowest in Lamprosema diemenalis Guen. whereas Apogonia spp. were recorded as eating the greatest leaf area among adult Coleopteran pests. The natural enemies were also recorded in case of S. obliqua and L. diemenalis. Data on the biology of some of the insect pests are given and discussed briefly. |
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