LIFE TABLE STUDIES OF APHIS GOSSYPII GLOVER (HOMOPTERA : APHIDIDAE) ON BRINJAL
M.A. SATTAR SHAH *
DEPARTMENT OF ZOOLOGY, Y.K. COLLEGE, WANG JING-795 148, INDIA.
T.K. SINGH *
DEPARTMENT OF LIFE SCIENCES, MANIPUR UNIVERSITY, IMPHAL-795 003, INDIA
R.K. RADHAKRISHORE *
DEPARTMENT OF ZOOLOGY, MANIPUR COLLEGE, IMPHAL-795 003, INDIA
*Author to whom correspondence should be addressed.
Abstract
Life table studies of Aphis gossypii Glover infesting brinjal was conducted in the laboratory. The net reproductive rate (Ro) was worked out as 29.225 females/female/generation. The mean length of generation time (T) was 9.5482 days. The intrinsic rate of increase (y) and finite rate of increase ().) were worked out as 0.35347 and 1.4240 females/female/day respectively. On reaching the stable age distribution, the population comprised mainly of nymphs. In addition, the life expectancy (ex) of A. gossypii was found to decline gradually with the advancement of age.
Keywords: Aphis gossypii, brinjal, Life table