دراسة اولية عن ظهور خنفساء كولارادوLeptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) على محصول البطاطا في شمال العراق ومكافحتها

Abstract

This study was carried out on the potato field at Nineveh and Dhouk governorates during 2005, included field surveys about dispersion of Colorado beetle Leptinotarsa. decemlneata and its infection severity, and testing several insecticides against this insect.The results showed that infection ranged between light and severe, the light infection were found in the Rabeah, Baashiqa, Al-qush, Telkef and Al-Namroud at Nineveh governorate, were 0.4 egg mass / plant, 1.0 larvae / plant & 0.01 adult / plant. While the infection was high in Al-Shekhan / Nineveh and Qasrouk / Dhouk, were (0.2 egg mass / plant, 4.6 larvae / plant and 0.04 adult / plant) and (0.03 egg mass / plant, 5.8 larvae / plant and 0.07 adult / plant), respectively. The results showed that the insecticides Thiamethoxam 25 WG, Lambdacyhalothrin 5 % EC and Sevin 85% WP were the best against larvae and adults, the killing percentages were (99.38, 99.31 and 97.59 %) and (100, 96.56 & 94.84 %) respectively, compared with the insecticides Cypermethrin 10% EC and Lufenuron 5 % EC were (58.56 and& 62.7 %) and (90.4 and 84.16 %) in the larvae and adult respectively. All insecticides above were low efficacy against eggs, were less than 40 %.