Publisher: Bachudo Science Co. Ltd

Variation of Rice Yield With Temperature and Rainfall At Ogoja, Nigeria

F. I. Okpiliya
KEYWORDS: Natural chemicals, synthetic insecticides, wheat grains, cereals

ABSTRACT:

The efficacy of the powder of a natural plant product (Acorus calamus L.) and two synthetic insecticides (i.e. Pirimiphos methyl and Rotenone) was compared in the laboratory for the control of Sitophilus oryzea {L), Rhizopertha dominica (F) andTribolium castaneum (Herbst) in stored wheat grains. Seven concentrations of the test chemicals (Le. 1.25, 2.5, 5.0, 10.0, 15.0, 20.0 and 25kg per kilogramme of wheat grains) were used. The control treatment consisted of 1 kg untreated wheat grains. Percentage mortality was recorded cumulatively at 48h intervals for 16 days. Pirimiphos·methyl at 5g/kg of wheat grains gave 100% mortality of S. oryzea as against A. calamus powder and Rotenone that gave 46. 56% and 26.44%, respectively Mortality observed on R. dominica indicated that Z5g of A. calamus powder resulted in significantly (P 0.05) higher percentage mortality 83.22% than pirimiphos-methyl that gave 56.65% and Rotenone with 36.47%. Only pirimiphos-methyl and Rote none was toxic to T. castaneum, A. calamus powder was not.


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