茜草等23种植物对棉铃虫生物活性的研究

Studies on insecticidal activity of 23 plant powders against Helicoverpa armigera

为寻求对有害生物高效、非靶标生物安全、对人类健康和生态环境安全的生物农药,本研究采用饲料混毒法,测定了23种植物干粉对棉铃虫生长发育的影响。结果表明,茜草、儿茶、白头翁、丹皮和香铃子表现出较强的生长发育抑制作用。以茜草的影响最明显,体重抑制率最大时为84.87%,试虫体重仅43.15 mg,而对照高达285.27 mg;幼虫历期达19 d,比对照延长了5 d;尤其对成虫产卵有明显的影响:产卵量比对照约少700粒,产卵历期缩减了3 d,卵的孵化率也仅有67.0%。茜草不同溶剂提取物对棉铃虫均表现出良好的拒食活性,但触杀活性和胃毒活性比较低。95%乙醇提取物的拒食活性最高,石油醚提取物的胃毒活性最高;各溶剂提取物的触杀活性均较低,校正死亡率均在5%以下。

In order to seek an efficient,human and eco-friendly bio-pesticide,the growth and development effects of the powder of twenty-three plants on the larvae of Helicoverpa armigera,including Rubia cordifolia L,Acacia catechu Willd and Pulsatilla chinensis etc,were tested by diet-incorporated method.The results showed that the powder of R.cordifolia L.,A.catechu Willd,P.chinensis,Paeonia suffruticosa Andr and Toona sinensis Roem had much effect on the larvae of H.armigera.And R.cordifolia L.was the best one,whos...