INSECTICIDAL ACTIVITY OF ANNONACEOUS SEED EXTRACTS AGAINST Crocidolomia binotalis ZELLER (LEPIDOPTERA: PYRALIDAE)
Gani, Mahir S.
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Insecticidal Activity of Annonaceous Seed Extracts against Crocidolomia binotalis Zeller (Lepidoptera: Pyralidae) . Insecticidal activity of seed extracts of II species of Annonaceae was evaluated against Crocidolomia binotatis Zeller in a leaf-residue feeding bioassay. Acetone seed extracts of Annona glabra and A. squamosa showed strong insecticidal activity against C. binotatis and both extracts were more active than Derris elliptica root extract. Aqueous seed extracts of the two Annona species were also active against the test insect. Acetone extracts of three other Annona species (A. montana, A. reticulata and A. muricata) at 0.25% exerted only low to moderate lethal effect, whereas those of the other six species were inactive. The treatment with extracts of the latter three Annona species delayed pupation of C. binotatis larvae by only 0.20 - 0.51 day, whereas the delay caused by D. elliptica root extract was 1.42 days. Effect of A. glabra and A. squamosa extracts on development of C. binotatis larvae could not be determined since all test larvae had died at day 2.