אסיף מאגר המחקר החקלאי

Influence of temperature and relative humidity on survival and fecundity of Pauridia peregrina, a parasite of mealybugs and its interactions with Planococcus citri

Year:

1982

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Volume :

32

Co-Authors:

Gol'Berg, A.M., Entomology laboratory, ARO, Gilat Regional Experiment Station, Negev, Israel

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Abstract:

Some biological aspects of the encyrtid parasite Pauridia peregrina Timberlake were studied. Non-ovipositing ♀♀ lived longer than ovipositing ♀♀. Parasite survival was strongly affected by relative humidity. Females survived best at 21.5° and 92% r.h.; 41.0° and 45% r.h. caused 96.7% mortality within 3 hr. Total number of eggs laid was not influenced by 49-71% r.h. at 26.5°. Lowering of the r.h. increased the proportion of the eggs laid on the first day to 91.1, 65.9 and 59.1%, respectively, at 49, 57, and 71% r.h. The parasite could complete development in mealybugs (Plaococcus citri (Risso)) growing on young twigs of grapefruit. Grapefruit sepals provided good protection to mealybugs against P. peregrina. © 1982 Springer-Verlag.

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