Zahraa M. Baidaq*(1) Ali M. Ramadhane(2) and Randa Abu Tara(3)
(1). Agricultural Research Center of Latakia, General Commission of Scientific Agricultural Research (GCSAR), Damascus, Syria.
(2). Department of Plant Protection, Faculty of Agriculture, Tishreen University, Lattakia, Syria.
(3(. Faculty of science, Damascus University, Damascus, Syria.
(*Corresponding author: Eng. Zahraa Baidaq. E-Mail: Zahraaok2@hotmail.com).
Received: 22/11/2016 Accepted: 17/01/2017
Abstract
This work aimed to study the environmental factors influencing growth stopped of olive leaf midge Dasineura oleae F. loew (Dipter: Cecidomyiidae) and its host (Hymenoptera: Platygasteridae) Platygaster demades Walker, such as temperature and reservation period. A series of experiments had been done to end this phenomena of larvae by changing temperatures from suitable temperature at 1±20 °C accompanied with different photoperiods 16 L: 8D and relative humidity of 75± 5% during 15, 30, and 60 days, to low temperature at 1 ±7 °C accompanied with complete darkness and relative humidity of 75± 5% for 15 days. This had been done after 30, 60, 90 and 120 days of growth stopped. The experiments showed that there was a strong correlation between P. demades and the host. The larval activity of P.demades was synchronized with the host at all stages in which an activity was recorded. The results showed that D. oleae enters in a real diapause, that can be ended as larvae was exposed to low temperature for more than 15 days. It has been shown that temperature is the limiting factor of D. oleae diapause and its parasitoid P. demades.
Keywords: Olive leaf midge, Dasineura oleae, Endoparasitiod, Platygaster demades, Diapause, Temperature.
Full paper in Arabic: PDF