【摘要】 在银盾革蜱若虫发育的不同时期：饱血后２ｄ（２－ｐＥ组）、６ｄ（６－ＰＥ组）和１２ｄ（１２－ＰＥ组）局部施用２０－羟基蜕皮酮，剂量分别为１、５、１０、２０和４０μｇ。结果表明处理时间（Ｔ）和施用剂量（Ｄ）对若虫蜕化期和存活有显著影响，双因素方差分析，Ｔ：ｄｆ＝２，Ｆ＝７３．７９，Ｐ＝０．０００；Ｄ：ｄｆ＝６，Ｆ＝３０．９７，Ｐ＝０．０００。单因素方差分析，剂量大于１０μｇ缩短了若虫蜕化期（差异极显著），１μｇ、５μｇ也有此效应（差异显著）。６－ＰＥ组效果最明显，与２－ＰＥ组、１２－ＰＥ组差异极显著。２０－羟基蜕皮酮对若虫有致死作用，蜕皮前死亡和蜕皮后死亡与施用剂量和时间有关，剂量大于１０μｇ时，所有实验组死亡率均为１００％。Ｐ＜０．０１表４施用剂量（２０－Ｅ）对若虫蜕化期的影响（Ｏｎｅ－ｗａｙＡＮＯＶＡ）Ｔａｂ．３Ｅｆｆｅｃｔｓｏｆｄｏｓａｇｅ（２０－Ｅ）ｏｎｎｙｍｐｈａｌｍｏｕｌｔｉｎｇｐｅｒｉｏｄ（Ｏｎｅ－ｗａｙＡＮＯＶＡ）：Ｐ＜０．０１：＊：Ｐ＜０．０５对照Ⅰ─未处理；对照Ⅱ─乙醇处理ＣｏｎｔｒｏｌⅠ─Ｕｎｔｒｅａｔｅｄ；Ｃｏｔｒｏｌ　Ⅱ─Ｅｔｈａｎｏｌ图１２－ＰＥ组若虫在不同剂量处理下的死亡率Ｆｉｇ．?更多还原

【Abstract】 During various development period: 2 days postengorgement (2-PE group), 6 days postengorgement (6-PE group) and 12 days postengorgement (12-PE group), the nymphs of Dermacentor niveus Neumann were topically applied exogenous 20-hydroxyecdysone with doses of 1,5,10, 20 and 40μg respectively. The results indicated that the time of treatment(T)and the dose applied (D)have significant effects on nymphal moulting period and viability, One-way ANOVA analysis showed that 10, 20 and 40μg significantly shortened nymphal moulting period and 1μg, 5μg shortened it also,Nymphs of 6-PE group were more sensitive than that of 2-PE and 12-PE groups.20-hydroxyecdysone also has lethal effects on nymphs. Pre-and post-moulting mortality correlated withapplication doses and the time of treatment. The total mortality in all groups were 100% while the dose was more than 10μg.更多还原