干旱区生态环境知识资源中心

Laboratory and field trails were carried out against some acridid pests (desert locust, Schistocerca gregaria and some species of the grasshoppers, Acridella nasuta Acrotylus insubricus, Chrotogonus homalodemus, Euprepocremis plorans, Hetracris annlosa, Catantops axillaris and Aiolopus strepens) at Wadi Diib in the south of Egypt and Baharia Oasis to evaluate the performance of spinosad (Tracer 24SC) and its efficacy on the target pests in comparison to the conventional pesticides, chloropyrifos (Pestban 48%EC) and malathion (Malatox 57% EC) under laboratory and the field conditions. The laboratory results indicated that spinosad was effective against 2(nd) and 4(th) nymph instars of S. gregaria where LC(50)s were 23.82 and 30.48 ppm, respectively. In the field, spinosad at the concentration of 65 ml/100l. caused 75% mortality :among S. gregaria nymphs after 24hr and reached 100% after 48hr. Meanwhile, Pestban Caused 85 and 100% mortality after 24 and 42hr. respectively. Also, when spinosad was applied against common grasshoppers at Baharia oasis at 50ml/100L concentration, it caused 83.3 and 100% mortality after 24 and 48hr, respectively. while Pestban caused similar effects (85 and 100%) after the same periods. Spinosad is a successful bio-insecticide for locust and grasshopper control.