Abstract
Some aspects of the biology of Diparopsis watersi (Rothschild) were investigated in the Nuba Mountains area in western Sudan from 1967–70. The mean incubation period of eggs varied from 3.4 days in Aug. and early Sept. to 5.5 days in Oct. and Nov., the differences being attributable to variations in ambient temperatures. The mean larval duration during Sept. and Oct. was 2.7 days for the 1st instar, 2 days for the 2nd, 3rd and 4th instars, and 4.3 days for the 5th instar. The rate of growth in successive larval instars was ca. 1.6. The majority of pupae occurred 2.5–15.0 cm deep in the soil. Oviposition was heaviest during the 1st 2 nights after moth emergence. The maximum number of eggs laid/female moth was 242. Population studies indicate a negative correlation between the amount and earliness of rainfall and the abundance of D. watersi . Carbaryl at 2-lb AI/feddan (1.04 acre) gave good control of D. watersi larvae and increased cotton yield by 40%.
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