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Pakistan Journal of Biological Sciences

Year: 2004  |  Volume: 7  |  Issue: 12  |  Page No.: 2125 - 2129

Effectiveness of Soybean Oil and Powder from Leaves of Lantana camara Linn. (Verbenaceae) as Protectants of Stored Maize Against Infestation by Sitophilus zeamais Motsch. (Coleoptera: Curculionidae)

Paul Koona and Jean Njoya


Soybean oil and powder from leaves of Lantana camara were tested at the farm level for efficacy in protecting maize grains from damage and for insecticidal activity against the maize weevil Sitophilus zeamais. Grains were stored in jute bags for seven months during which they were treated every two or three months with either of the two natural products. The two treatments showed significantly lower percent grain damage (0.2-13% damage) than the untreated control (> 50% damage) (p<0.05). The efficacy of soybean oil when applied every two months was comparable (p>0.05) to that of the chemical control (Poudrox©, malathion 5%). The number of dead weevils in maize treated with soybean oil was similar (p>0.05) to that in maize treated with powder from leaves of Lantana camara. Contrast analysis showed that grain damage of maize treated every two months was not significantly different (p=0.083) from the damage of maize treated every three months. This suggests that after an initial treatment of grains at the beginning of a 7-month storage period, two additional treatments renewed every three months can be as efficient in protecting maize against damage by S. zeamais as three treatments applied every two months.

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