رصد بعض الآفات الحشرية والآعداء الطبيعية المصاحبة لمحصول البطاطس/البطاطا ومدى انتشارها في بعض المناطق الشمالية الغربية/ ليبيا

Abstract

Potato (Solanum tuberosum L.) is one of the most important vegetable crops in the world. In Libya potato crop is subjected to infestation by some agricultural pests that cause economic losses. Field visits were conducted to fourteen regions to monitor insect pests associated with potato crop at some provinces in the north western area of Libya during spring season 2010. Results indicate the presence of fifteen different species belong to seven insect orders which are Coleoptera, Diptera, Hemiptera, Homoptera, Hymenoptera, Lepidoptera and, Thysanoptera. Results discussed presence of Tweelve phytophagous insect species were identified based on morphological and anatomical characteristics. The most important were the potato tuber moth Phthorimaea operculella (Zeller). The mean number of potato tuber moth attracted to pheromone traps was 1389.4 and the highest 55.8% in Alhamrunia, 22.5% in Wadi-rabeea, 15.2% in Annasheia and, the lowest 6.4% in As-swani. Results describe four species of plant bugs: Eysarcoris inconspisuus (Herrich Schaeffer), Lygus elisus Van Duzee, L.hesperus Knight, Polymerus spp., two species of aphids: Myzus persicae (Sulzer), Aphis gossypii Glov., one species of leaf hopper Empoasca fabae (Harris), psyllid, Paratrioza cockerelli (Sulc), white fly, Bemisia tabaci (Gennadius), leaf miner, Liriomyza huidobrensis (Blanchard) and, Thrips sp.. Results indicate some variations in their presence percentage from region to another. Potato leaf hopper E. fabae (Harris), is the highest 35.8 % and, white fly the lowest 0.2 %. Also our results demonstrate the presence of two species of parasites on leaf miner L. huidobrensis (Blanchard) which are Diglyphus isaea (Walker) D.crassinervis Erdös, which their presence 22.9% and 11.4% respectively. One species of predators Hippodamia variegata Goeze on aphids with 65.7%. These results encourage continuing future research in other potato production area to establish potato integrated pest management programme.