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Entomotoxic potential of Morinda lucida (benth.) Leaf powder as contact and fumigant biopesticides in the management of Plodia interpunctella (Hubner) [Lepidoptera: Pyralidae].

Adeyera OJ*, Akinneye JO, Odeyemi OO

 

The toxic effects of leaf powder of Morinda lucida against the developmental stages of Plodia interpunctella was investigated in this study. Air-dried leaf of Morinda lucida was pulverized into fine powders and administered at 0.5, 1.0, 1.5, 2.0 and 2.5 g dosages to maize grains containing egg, larval and adult stages of P. interpunctella separately, for contact and fumigant treatments. The insecticidal activities of the leaf powder was monitored at 24, 48, 72 and 96 h post-treatment periods. The leaf powder achieved 100% larval mortality at 1.5 g dosage after 72 h and 96 h post-treatment period as contact insecticide. Also, 1.5 g, 2.0, and 2.5 g dosages of the leaf powder deterred egg hatchability, thus no adult emergence was recorded in these treatments. The leaf powder as a contact insecticide also achieved 100%adult mortality at 1.5 g, 2.0 g and 2.5 g dosage after 72 h and 96 h post-treatment period. As a fumigant insecticide, no deterrent to egg hatchability was recorded, 100% larvae mortality was recorded in 2.0 g and 2.5 g treatments after 96 h post treatment, while 100% adult mortality was recorded in 2.5 g treatment after 72 h post treatment. The results obtained from this study shows that the leaf powder of M. lucida has some insecticidal properties that could be considered in the integrated management of P. interpunctella infesting stored foods.

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