Date : 2017/02/22
A. R. Elkhouly, Mohamed .O. Albasha* and A.L. Hririg
E.mail :- email@example.com ( M. O. Albasha* ) د. محمد عمر زائد الباشا
International Conference on Agriculture and Biology Science (ABS2015)
July 25-27, 2015 Beijing, China
Natural abundance of the ectoparasitoidDiglyphusisaea walker was studied on four winter host plants [broad bean (Veciafaba), pea (Pisumsativum) , mallow (Malvasylvestris) and snow thistle (Sonchusoleraceus)] in Alejelat region. The parasitoid showed low populations in December on all studied host plants except broad bean. Then developed high populations in February and march , the population decreased till the end of the growing season.
D.isaea recorded 3-4 peaks of abundance on all studied host plants, the highest peak recorded 64, 198, 70 and 103 individuals/ 100 infested leaflets on broad bean, pea, mallow, and snow thistle respectively . The highest average numbers occurred in December on broad bean recording 41.0±20.7, in March on pea recording 127.0±74.0 ,and in February on mallow and snow thistle recording 37.8±19.1 and 87.5±12.7individuals/ 100 infested. On the other hand the monthly average percentages of parasitism recorded its highest numbers in January (66.7±5.6%, 69.5±13.4% and 57.9±6.7%) on brad bean, pea , and mallow respectively and 68.8±6.9% on snow thistle in March. The percentage of killed larvae according to host-feeding recorded its highest monthly average numbers January on broad bean, pea , mallow and snow thistle recording (21.7±17.7, 17.3±4.3, 23.7±2.1 and 14.4 ± 5.5) respectively.
Key words: Diglyphusisaea, abundance, host plants