LIFE TABLE AND GROWTH RATE STUDIES OF APHIS GOSSYPII (GLOV.) (HOMOPTERA)
BHOPAL SINGH *
PG-DEPARTMENT OF ZOOLOGY, S.D. COLLEGE, MUZAFFARNAGAR-251.001, INDIA.
S.C.. GOEL *
PG-DEPARTMENT OF ZOOLOGY, S.D. COLLEGE, MUZAFFARNAGAR-251.001, INDIA.
SANJAY KUMAR *
CENTRAL, INSECTICIDES LAB, PTE, PP.O. & S, NH-IV, FARIDABAD-121001, INDLA
*Author to whom correspondence should be addressed.
Abstract
The life table of Aphis gossypii was studied on bottle gourd under laboratory conditions of 15, 25, and 35°C; and 75, 65 and 60 percent R.H., respectively. The values for growth parameters observed were intrinsic rate of natural increase (m = 0.106 female/female/day), true generation time (T = 17.118 days), finite rate of increase (2 = 1.112 females/female/day) and doubling time (DT = 6.539 days) at 15°C. The stable age distribution have also been evaluated. Poor and no egg laying was observed at 25 and 35°c, respectively.