Effect of Lamdacyhalothrin on the population of Podagrica uniforma (jacoby) and p. Sjostedti (jacoby) and the yield of okra (abelmoschus esculentus (l.) moench in the calabar humid area.

Abstract

The population trend of Podagrica uniforma (Jacoby) and P. sjostedti (Jacoby), serious pests of okra in Calabar, were monitored on late season dwarf okra under four spray regimes of Lamdacyhalothrin, a synthetic pyrethroid applied at 25g a.i./ha. P Uniforma was significantly more abundant on late season okra than P. sjostedti at P = 0.05. All spray regimes significantly reduced the population of P. uniforma and P. Sjostedti at P = 0.05, but only the yield of okra treated once a week was significantly higher than the untreated control. The correlation coefficient (r = - 0.87) showed that the population of the pests on okra during the late season actually affected its yield. Although once-in-a-week spray regime gave the highest yield, once-in-two-weeks spray regime would be most appropriate and is recommended for the Calabar area on late crop for economic reasons.

Journal of Applied Chemistry and Agricultural Research Vol. 1 (1) 1994: pp. 25-29