Some attempts to develop new insecticides from plant sources
Studies on the application of extracts from plants as insecticides showed interesting results. Extracts from 8 varieties of plants applied during the third instar of the tobacco cutworm, Spodoptera litura were effective as contact poison and gave good control in killing the larvae. These varieties were: Curcuma longa (rhizome), Lancium domesticum (seed), Acorus calamus (rhizome), Pachyrrbizus erosus (seed), Annona squamosa (seed and peel), Nephelium lappaceum (peel), Cassia fistula (pod) and Hydnocarpus ilicifolius (seed). The extracted substance from kernel of Neem tree (Melia azadirachta) and persian lilac (Melia azedarach) showed higher toxicity and effectiveness as antifeedant than the leaf. Similarly, tobacco cutworm fed on mulberry leaf coated with substance from varieties of plants had higher larval and pupal mortality. Some larvae were not able to pupate but formed hard integument at the tergum or thorax; those that were able to pupate had thin integument. Most of the larvae died during the pupal stage and very few reached the adult stage. The adults that survived had some abnormalities. Females produced less eggs which had low percentage of hatching or did not hatch at all
| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
Taiwan (Taiwan)
1979
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| Subjects: | INSECTICIDAS DE ORIGEN VEGETAL, PLANTAS INSECTICIDAS, CONTROL DE INSECTOS, SPODOPTERA, PACHYRRHIZUS EROSUS, NEPHELIUM LAPPACEUM, ACORUS CALAMUS, ANNONA SQUAMOSA, CURCUMA DOMESTICA, CASSIA FISTULA, AZADIRACHTA, SPODOPTERA LITURA, LANCIUM DOMESTICUM, HYDONCARPUS ILICIFOLIUS, MELIA AZEDARACH, |
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