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Effects of Nutrition on Longevity, Fertility, Ovariol Yield, Food Consumption and Metamorphosis of the Grasshopper Euprepocnemis plorans

Published online by Cambridge University Press:  19 September 2011

G. El Sayed
G. El Sayed
Affiliation:
Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, Egypt, Fax 5722211
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Abstract

Effects of adult nutrition were investigated by measuring female longevity, body weight, fertility and ovariol yield in the grasshopper, Euprepocnemis plorans reared on 3 different host plants. Rearing the insect on lupine (Lupinus termis) and horsebean (Vicia faba) caused significant reduction in fertility and ovariol yield of its first and second pods compared with those reared on clover (Trifolium alexandrinum). Resorption bodies were significantly higher in the ovariols of females fed on L. termis and V.faba. Diet also affected longevity and body weight. Fecundity was highest in females reared on T. alexandrinum. Significant reduction in haemolymph protein was noted in females reared on L. termis and V. faba. Nitrile (allylcyanide) significantly reduced the approximate digestibility (AD), efficiency of conversion of ingested food (ECI) and efficiency of conversion of digested food (ECD), inhibited nymphal growth, increased food consumption and decreased its assimilation. Feeding grasshoppers on T. alexandrinum treated with 125–250 μ mole/g resulted in various degrees of malformation and death.

Résumé

L'effet d'alimentation du criquet adult, Euprepocnemis plorans élevé sur 3 différentes plantes-hôtes a été déterminé par mensuration de la longévité de la femelle, le poids du corps, la fertilité et la production au niveau des ovarioles. En comparaison des insectes élevés sur le trèfle (Trifolium alexandrinum), l'élevage de ceux-ci sur le lupin (Lupinus termis) et sur la fève (Vicia faba) réduisait la fertilité et l'activité de production de l'ovariole au niveau du premier et second lobes. La résorption des corps était plus prononcée dans les ovarioles de femelles nourries sur L. termis et V. faba. Cette alimentation affectait aussi la longévité et le poids des insectes. La fécondité était plus élevée chez les femelles nourries sur T. alexandrinum. On a observé une réduction important du taux de protéines dans l'hémolymphe chez les femelles élevées sur L. termes et V.faba. Le nitrile (allyle-cyanide) réduisait la digestibilité escomptée, la capacité de transformer la nourriture ingérée et celle digérée. La même substance inhibait la croissance et le développement des nymphes et elle augmentait la quantité de nourriture consommée tout en diminuant son assimilation. L'élevage des criquets sur T. alexandrinum traité au moyen de 125–250 μmole/g de nitrile conduisait à des degrés divers de malformation et à la mortalité des insectes.

Keywords

Euprepocnemis ploransreproductive behaviourfood consumptionnitrileinsect–plant interactionEuprepocnemis ploranscomportement de reproductionconsommation alimentairenitrileinteraction insecte–plante
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 4 , December 1998 , pp. 341 - 347
Copyright
Copyright © ICIPE 1998

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