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Seasonal changes in fat and water content in field populations of olive psylla Euphyllura olivina Costa (Homoptera Psyllidae)

Published online by Cambridge University Press:  19 September 2011

Tawfiq M. Mustafa
Tawfiq M. Mustafa
Affiliation:
Department of Plant Protection, Faculty of Agriculture, University of Jordan, Amman, Jordan
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Abstract

The seasonal changes in water content and fat content of olive psylla, Euphyllura olivina in the field were investigated in two successive years. The overwintering adults of olive psylla had more fat than spring and summer generation adults. There was a steady increase in % fat contents of females from mid-October to early January. The % fat of both sexes decreased sharply in May, June and July. There was a gradual reduction in % water content from mid-June to early October and then decreased steadily until early November. The % water in the overwintering adults ranged from 57.5 to 45% and became constant around 52.5% of live body weight in February and March. Seasonal changes in % water was positively related to population changes of olive psylla. The % water in olive psylla was negatively related to the fat content.

Résumé

Les changements saisonniers du contenu en eau et lipides de l'olive psylla Euphyllura olivina sur le terrain ont étè analysés pendant 2 ans. Les generations d'olives psylla adultes de l'hiver contiennent plus de lipides que celles du printemps et de l'été. Il y a eu une augmentation du pourcentage de lipides contenu dans les femelles à partir de la mi-Octobre au debut de janvier. Le pourcentage en lipides de deux sexes decrut considerablement pendant les mois de Mai, Juin et Juillet. D'autre part il y a eu une reduction graduelle du pourcentage en eau à partir de la mi-Juin au debut d'octobre et puis un decroissement continu jusqu'au debut de Novembre. Le pourcentage en eau des generations adultes d'hiver se situaient vers 52 % du poids total mais variaient entre 57,5 a 45%. Ce poids redevient constant (52,5%) au mois de Fevrier et Mars. Les changements saisonniers du pourcentage en eau etaient en relation positive avec ceux des populations d'olive psylla mais en relation negative en ce qui concerne leur contenu en lipides.

Keywords

Euphyllura olivinaolive psyllaolive groveseasonal changesfat contentwater contentEuphyllura olivinaolive psyllaarbust d'olivechangements saisonnierscontenu en lipidescontenu en eau
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 2 , April 1989 , pp. 181 - 185
Copyright
Copyright © ICIPE 1989

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References

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