تأثير درجات الحرارة في بعض الصفات الحياتية لمجتمعات المتطفلTichogramma principium Sugonyaev and Sorokina (Hym., Trichogrammatidae)‎ في سورية

Abstract EN

In the present work, the biological characteristics of three T.

pincipium parasitoid populations originating fromEaias irculana eggsin Syrian cotton fields (in Aleppo, Raqqa and Dek Ez-Zor) werestudied.Rearing otEphestialarchniella eggswasperformedunderdifferent controlled conditions : temperatures of 18,23, 28 and 33'C, relative humidity between 70 and75Yo, and L:D 16:8.

The mean fecundity at23"C durhg the first 24 hours was23.4+2.1eggs with a total fecundity of 85.7*3.7 eggs.

The estimated optimal temperature for fecundity was 24.5"C.

Temperatrue and -Q-od effects on adult longevity were investigated.

The relation between temperahue and development duration best fitted with D (days)=f J.436r2'22:1"a, rnT.

pincipium.

Minimum and maximum developmental thresholds wqe 12.3 and 35.6"C