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Bioassays of duck weed vegetation extracts

Published online by Cambridge University Press:  19 September 2011

M. A. A. Eid ,
M. A. E. Kandil ,
Eman B. Moursy  and
G. E. M. Sayed
M. A. A. Eid
Affiliation:
Faculty of Agriculture, Cairo University, Cairo, Egypt
M. A. E. Kandil
Affiliation:
Faculty of Agriculture, Cairo University, Cairo, Egypt
Eman B. Moursy
Affiliation:
Faculty of Agriculture, Cairo University, Cairo, Egypt
G. E. M. Sayed
Affiliation:
Faculty of Agriculture, Cairo University, Cairo, Egypt
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Abstract

Bioassays against the fourth instar larvae of mosquito, Culex pipiens pipiens showed that the non polar part of the duck weed, Lemna minor extracts has a high insecticidal action. On the other hand, these extracts contained synomones of the duck weed which repelled the ovipositing females. By using concentrations equivalent to LC25, the survival resulting by the n. hexane was the least. The tolerance for the sublethal doses was associated with malformations in all stages. First instar larvae and recent pupae were more susceptible to the duck weed synomones than the other larval instars. The duck weed synomones repelled the ovipositing females of Piophila casei and have had an insecticidal effect on larvae and reduced resulting adults. When larvae of Spodoptera littoralis were subjected to sublethal doses of duck weed extract, malformations in the subsequent stages were found.

Résumé

Les biotitrations des larves du 4ème instar du moustique, Culex pipiens pipiens ont prouvé que l'extrait du côté non-polain du duck weed, Lemna minor a un effet insecticidal, et que cet extrait contient des synomones qui ont un effet répugnant pour les femelles adultes des moustiques. L'utilisation des concentrations équivalentes à LC25 du n. hexane a donné une haute mortalité.

La tolérance coutre les doses sous-mortelles fut accompagnée des malformations de tous les stades. Les premières larves ainsi que les pupes furent les plus sensibles aux synomones.

Les synomones du duck weed n'ont pas seulement un effet répugnant pour les femelles du Piophila casei mals ont aussi un effet insecticidal centre les larves et les adultes. Quand les larves du Spodoptera littoralis furent soumises à des doses sous-mortelles des extraits du duck weed, alors celles-ci donnent des adultes malformées.

Keywords

Duck weedLemna minormosquitoCulex pipiens pipiensPiophila caseiSpodoptera littoralisextractsbioassaymalformationLemna minorduck weedCulex pipiens pipiensSpodoptera littoralisbio-titrationsynomonesmalformations
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 13 , Issue 5 , October 1992 , pp. 741 - 748
Copyright
Copyright © ICIPE 1992

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