Open AccessEvaluation of two phyto powder combinations (Azadiracta indica and Zingiber officinale) and a synthetic insecticide (Primiphos methyl powder) in the control of cowpea weevil Callosobrucus maculatus (Fab.)
Author(s) -
Anthonia Nnenna Chuks Amadi,
Briandavis Nnaemeka Ibediugha,
Prince Chigozirim Ubiaru,
F. O. God’slove
Publication year - 2020
Publication title -
nigerian journal of pure and applied sciences/nigerian journal of pure applied sciences
Language(s) - English
Resource type - Journals
eISSN - 2756-3928
pISSN - 2756-4045
DOI - 10.48198/njpas/19.b22
Subject(s) - vigna , weevil , callosobruchus maculatus , zingiber officinale , azadirachta , biology , horticulture , completely randomized design , toxicology , traditional medicine , pest analysis , medicine
Cowpea (Vigna unguiculata L. walp) is one of the most important leguminous crops that are widely grownthroughout the tropics. The aim of the study is to evaluate the combination of two botanical powders and asynthetic insecticide in the control of cowpea weevil (Callosobruchus maculatus) on stored cowpea grain. Thebotanical powders were admixed with the cowpea grain at a combination of 3:7, 7:3 and 5:5 per 50g of beanswhile the primiphos methyl powder was admixed at 0.25g per 50g of cowpea. In the control, no treatment wasused. The experimental design adopted for the experiment was Complete Randomized Design (CRD) and eachtreatment was replicated four times for each experiment. Twenty (20) adults of C. maculatus unsexed (takenfrom stock culture kept in the laboratory) were introduced into each vial including the control and were coveredwith muslin cloth held tightly in place with rubber band to prevent the weevils from escaping. The experimentswere monitored for 72 hours. The results showed that the plant powders and primiphos methyl powder weregood grain protectants. The highest mortality recorded was in primiphos methyl powder (78) followed by thecombination of Azadirachta indica and Zingiber officinale powder at the ratio of 5:5 (76), 7:3 (68) while theleast was 3:7 which recorded 62. The mean mortality of C. maculatus caused by primiphos methyl powder (6.50),was significantly (P<0.05) different from the untreated control (0.00), but was not statistically different from thecombination of Azadirachta indica and Zingiber officinale in the ratio of 5 to 5, but the combinations of A. indicaand Z. officinale in the ratio of 3:7 and 7:3 were significantly different. The study suggests that botanicals shouldbe incorporated into grain protection as alternatives to chemical insecticides in the control of C. maculatus incowpea grain during storage.