POPULATION DYNAMICS AND MANAGEMENT OF APHID, Aphis craccivora Koch IN COWPEA, Vigna unguiculata (L.) Walp. GROWN FOR SEED PURPOSE
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Date
2018
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DEPARTMENT OF AGRICULTURAL ENTOMOLOGY B. A. COLLEGE OF AGRICULTURE ANAND AGRICULTURAL UNIVERSITY ANAND
Abstract
Investigations on “Population dynamics and management of aphid, Aphis
craccivora Koch in cowpea, Vigna unguiculata (L.) Walp. grown for seed purpose”
were carried out at Main Vegetable Research Station, Anand Agricultural University,
Anand (Gujarat) during summer and kharif, 2017.
Aphid population first appeared during first week of March in summer, 2017
when crop at vegetative growth stage. Incidence of the aphid on cowpea was observed
from March to April. Initially, its population was low, gradually increased in its
numbers and attained peak level (27.14/3 cm twig) at flowering to pod developing
stage during first week of April. Then after, aphid population decreased and
disappeared with the maturity of crop from first week of May. Aphid incidence was
found higher during 1st to 4th week of April. In kharif, 2017 population of aphid first
appeared during 4th week of August and gradually increased up to the 3rd week of
October and then after disappeared from 1st week of November. It’s peak level
(30.10/3 cm twig) was found in 1st week of October, coincide with the flowering to
pod developing stage of the crop. No significant impact of studied abiotic factors was
observed on aphid population.
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