Bionomics of Alcidodes signatus Boheman (Coleoptera: Curculionidae), a serious pest of green bean, Phaseolus vulgaris L. from Udhampur district of Jammu (J&K, India)

Abstract :

Alcidodes signatus Boheman has been recorded as a serious pest of bean with adults feeding externally on the soft parts of the plant and larvae feeding internally and inducing galls. Though the weevil feeds on other host plants like Capsicum sp., Indigofera tinctoris, Ipomoea nil, Parthenium sp., and Salvia sp., breeding and gall induction has been studied only on Phaseolus vulgaris. Adults were active from July to November and population peak was recorded during September-October months, coinciding with the availability of host plant. Copulation lasted for about half an hour and a maximum of three larvae (Plate 1, Fig. C & D) were recorded from a single gall. Incubation period lasted for 5 to 7 days. Total number of instars observed during the study were five. Larval period lasted for 35 to 42 days and pupal period lasted for 10-12 days. Newly emerged weevil remains in the pupal chamber for 3-7 days and its color changes to become typical of the adult. Percentage infestation recorded during the period was 70%. Total life span varies from 50-60 days and at least two generations were observed during the period under study

Keyword :

Bionomics, Alcidodes signatus, Phaseolus vulgaris, Udhampur, Alcidodinae, Curculonidae, Coleoptera, India

Author(s) : Sharma, S., Kour, R., Tara, J. S., Ramamurthy, V. V.
Downloads : 1790
Published Issue : 2012 Vol. 7 Number 2

2012 Vol. 7 Number 2