The parasite-host relationship between Encarsia formosa (Hymenoptera, Aphelinidae) and Trialeurodes vaporariorum (Homoptera, Aleyrodidae). 15. Oogenesis and oviposition of Encarsia formosa
1986
Vianen, A. van (Wageningen Univ. (Netherlands). Dept. of Entomology) | Lenteren, J.C. van
The overall rate of oogenesis of Encarsia formosa is positively correlated with temperature and negatively correlated with the number of eggs already present in the ovarioles. Storage capacity is limited to about 2 mature oocytes per ovariole. The extrapolated temperature threshold for oogenesis is near 2 degrees C. After a few days without possibilities to oviposit, more eggs are resorbed than newly produced, but mature oocytes are still present after a month without oviposition possibilities at 20 degress C. The number of oocytes present in the ovarium increases proportionally to the number of ovarioles. Oviposition of E. formosa reaches a maximum at 25 degrees C and stops below 12 degrees C or above 40 degrees C. The rate of oogenesis is not the limiting factor for oviposition at low temperature regimes
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