两种选择性农药的使用对刺激三化螟产卵及水稻生化影响的研究

 扑虱灵、吡虫啉是选择性杀虫剂,主要目标是同翅目昆虫。经2年3个代次的试验研究,结果表明,非目标害虫三化螟幼虫取食2种农药处理的秀水63,其后代成虫产卵量显著高于对照,刺激了三化螟产卵。但这种效应又与水稻品种有关,对三化螟有中等抗性的镇稻2号不明显。另外,低龄幼虫(1龄)处理后刺激成虫产卵比高龄幼虫(3龄)处理更明显。生化测定表明,扑虱灵、吡虫啉处理后,水稻植株的草酸含量有一定下降,叶片光合速率显著下降,还原糖除扑虱灵在秀水63外,均有显著增加,谷胱甘肽-S-转移酶因水稻品种和农药而异。

Studies on Stimulating Effect of Two Selective Insecticides on the Number of Egg Laid by Rice Yellow Borer, Tryporyza incertulas (Walker) and Their Effects on Biochemistry of Rice Plants

Buprofezin and imidacloprid are selective insecticides against Homoptera insects. The stimulating effect of the insecticides on the number of egg laid by rice yellow borer[ Tryporyza incertulas (Walker)] of three generations was studied in 2001 - 2002. The results showed that the reproductive rate of emerging months during the larvae feeding on rice plants of Xiushui63 treated with the two insecticides was significantly higher than that of control, indicating the number of egg laid by the borer were stimulated following buprofezin and imidacloprid application. However, No such effect was found while for the larvae feeding on rice variety Zhendao2 which showed moderate resistance to the insect. In addition , the incidence of stimulating egg laid for the first instar treated with the two insecticides was greater than that that of for the third instar. Biochemistry tests showed that oxalic acid content declined, and photosynthetic rate of rice leaves following the two insecticides application declined significantly compared to control, whereas the sugar concentration increased significantly in other treatments of two varieties except Xiushui63 treated with buprofezin. The level of glu-tathione-S-transferase varied with rice variety and insecticide.