Abstract

                                Life table studies on cauliflower, cabbage and mustard showed that DBM had a gross reproductive rate of 89.16, 115,40 and 86.78 female eggs per female on the above three crops. The species had a capacity for natural increase of 0.16, 0.17 and 0.13 females per day on cauliflower, cabbage and mustard with a (daily finite rate of increase) of 1.18, 1.19 and 1.14 females per day, the population would multiply 3.18, 3.38 and 2.50 times every week.

Key words : Intrinsic rate of increase, Finite rate of increase, Gross reproductive rate, Plutella xylostella