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Some attempts to develop new insecticides from plant sources Sensible use of pesticides

by Somaatsiri, K; Pathumchartpat, W. Kasetsart Univ., Bangkok (Tailandia). Dept. of Entomology; Food and Fertilizer Technology Center, Taiwan (Taiwan); Seminar on Sensible Use of Pesticides Tokio (Japón) 28 Nov-3 Dic 1978.
Series: FFTC Book Series - Food and Fertilizer Technology Center (Taiwan).Publisher: Taiwan (Taiwan) 1979Description: p. 158-165.Subject(s): 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 | BOTANICAL INSECTICIDES | INSECTICIDE CROPS | INSECT CONTROL | SPODOPTERA | NEPHELIUM LAPPACEUM | ACORUS CALAMUS | ANNONA SQUAMOSA | CURCUMA DOMESTICA | CASSIA FISTULA | AZADIRACHTA | SPODOPTERA LITURA | MELIA AZEDARACH | INSECTICIDE D'ORIGINE VEGETALE | PLANTE INSECTICIDE | LUTTE ANTIINSECTE | SPODOPTERA | NEPHELIUM LAPPACEUM | ACORUS CALAMUS | ANNONA SQUAMOSA | CURCUMA DOMESTICA | CASSIA FISTULA | AZADIRACHTA | SPODOPTERA LITURA | MELIA AZEDARACH In: Summary: 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
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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

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