TEMPERATURE STRESS EFFECT ON THE DESERT LOCUST, SCHISTOCERCA GREGARIA USING BIORATIONAL COMPOUNDS

Journal of the Egyptian Society of Parasitology Pub Date : 2023-12-01 DOI:10.21608/jesp.2023.331727

Nagah Al-Maroug, Mamdouh Nassar, Mohamed Elshazly, Eman Abd Elfattah, Dina H. Abd El-Monem

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Abstract

Desert Locust, Schistocerca gregaria (Forskål), is one of the important insect pests worldwide. Chemical insecticides proved effective in controlling these locust, but with bad ecosystem impact. This study evaluated the temperature stress on biorational insecticides against Schistocer ca gregaria . Newly moulted 5 th instar nymphs of the desert locust were feed on clover leaves treated with LC 50 of Azadirachtin, Rotenone, Sabadilla and Limonene. Also, anti-hormonal effects of Precocene II showed decrease in protein; carbohydrate and lipid of haemolymph contents after 24hrs treatment of 5 th nymph instar with these biorational insecticides. The higher LC 50 was 3.4 obtained after treating 5 th nymphal instar with azadirachtin, lower LC 50 was 4.2 caused by lim-onene with LC 90 of 15.2 & 28.2% respectively. These biorational insecticides affected protein, lipid and carbohydrate of 5 th nymphal ones, added by temperature marked stress. Supernumerary (extramoulted) nymph emerged after treating 5 th nymph instar with Precocene II. Precocene II caused nymph malformations at high concentration (33.3%; 1000ppm) and at low concentration (14.2%; 50ppm), and blocked adult emergency with increased concentrations.

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利用生物化合物研究温度胁迫对沙漠蝗虫（schistocerca gregaria）的影响

沙漠蝗虫 Schistocerca gregaria (Forskål) 是世界上重要的害虫之一。事实证明，化学杀虫剂能有效控制这些蝗虫，但会对生态系统造成不良影响。本研究评估了温度胁迫对蝗虫生物杀虫剂的影响。沙漠蝗刚蜕皮的 5 龄若虫取食经 Azadirachtin、Rotenone、Sabadilla 和 Limonene LC 50 处理的苜蓿叶片。此外，Precocene II 的抗荷尔蒙作用表明，在用这些生物杀虫剂处理 5th 若虫 24 小时后，血淋巴中的蛋白质、碳水化合物和脂质含量均有所下降。用唑虫酰胺处理 5th 若虫后，LC50 为 3.4，LC50 为 4.2，LC90 分别为 15.2% 和 28.2%。这些生物杀虫剂影响了 5龄若虫的蛋白质、脂质和碳水化合物，并增加了明显的温度胁迫。用 Precocene II 处理第 5 代若虫后，出现了超数（蜕皮）若虫。在高浓度（33.3%；1000ppm）和低浓度（14.2%；50ppm）下，Precocene II 都会导致若虫畸形，并且随着浓度的增加，会阻碍成虫的紧急孵化。

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Journal of the Egyptian Society of Parasitology

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