IntroductionThe morphology of the digestive system of lepidopterous larvae have been studied by a number of workers. In the past twenty years, the anatomy and histology of the gut of lepidopterous larvae have been studied in the members of the following families:
The vegetative stage of yellow ecotype of Neurospora intermedia occurs on various substrates but there has been no evidence of its telomorphic stage in nature. This paper presents evidence for the sexual reproduction of this ecotype in nature on maize cobs.
Experiments were conducted to find out the insecticidal and antifeedant activity of extract of Calophyllum inophyllum seeds; fraction C and thionemone of neem (Azadirachta indica) seeds under laboratory conditions on 3rd instar larvae of Diacrisia obliqua at concentration levels of 1, 2.5 and 5% by contact and oral feeding methods. There was a positive correlation between applied concentration and mortality. Contact method gave more promising results (mortality rate was from 33.33% to 100%) in comparison to oral feeding (mortality rate 2.66 to 80%). None of the extract showed antifeedant activity.
Zusammenfassung
Untersuchungen zur Insektiziden und fraßhemmenden Wirkung einiger Pflanzenextrakte auf Diacrisia obliqua Walker (Lep., Arctiidae)
Im Labor wurde die insektizide und fraßhemmende Wirkung von Samenextrakten von Calophyllum inophyllum sowie der Fraktion C und Thionemon von Neemsamen (Azadirachta indica) untersucht. Es wurde die Kontakt‐ und Fraßwirkung dieser Extrakte auf Diacrisia obliqua L3‐Raupen in den Konzentrationen 1; 2,5 und 5% untersucht. Dabei zeigte sich eine positive Korrelation zwischen applizierter Dosis und Mortalität der Raupen. Die Kontaktwirkung war mit Mortalitätsraten von 33,3–100% höher als die Fraß Wirkung (2,66–80%). Eine fraßhemmende Wirkung konnte für keinen der Extrakte festgestellt werden.
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