高温天数和吡虫啉互作对麦长管蚜世代内与世代间生态表型的影响

Effect of heat wave duration and imidacloprid interaction on phenotypes within and between generations of Sitobion avenae

麦长管蚜Sitobion avenae是麦类作物主要的害虫之一,严重影响麦类作物的质量和产量。为了探究不同高温天数和农药互作对麦长管蚜世代内与世代间生活史性状的影响,调查了成蚜经高温事件34℃/3 h持续1 d、3 d和5 d与低剂量吡虫啉互作,对生活史性状的影响。结果表明,在世代内,随着高温天数增加,存活率随之下降,仅高温处理下由67.5%下降为12.5%,与农药结合后由70%下降为10%,但对寿命、繁殖却没有影响(P>0.05)。不同高温天数和吡虫啉的互作延迟效应主要加剧了对繁殖的负面影响,尤其是在高温天持续3 d和5 d(P<0.05),显著抑制了母代种群参数的增长。在世代间,母代单独经历不同高温天数后,对子代存活、发育、繁殖和寿命均没有显著影响(P>0.05)。高温天数和吡虫啉的互作主要对子代存活产生了负面影响,下降率可达33.3%,但两者的互作却对子代成蚜寿命、繁殖产生了正面刺激作用,大大减缓对子代种群参数的影响。上述结果将为气候变暖和农药双重胁迫下麦长管蚜种群动态的预测、防控提供一定的理论指导。

Sitobion avenae is a prominent grain pest of wheat crops,which seriously affects the quality and yield of wheat crops.To investigate the effects of different hot days and pesticide interactions on population dynamics of S.avenae,the effects of low dose imidacloprid combined with high temperature event 34℃/3 h for 1 d,3 d and 5 d on life history traits of maternal and offspring were determined.The results showed that in the maternal generation,the survival rate decreased with the increase of hot days,from 67.5%to 12.5%only under heat wave treatment,and from 70%to 10%when combined with pesticides.But there was no effect on longevity and reproduction with the increase of hot days(P>0.05).And,compared with the single hot day treatment,the delay effect of interaction between imidacloprid and different hot days mainly aggravate the negative effect on reproduction,especially in 3 d and 5 d(P<0.05).Therefore,the growth of maternal population parameters was significantly inhibited.Also in the offspring generation,maternal single hot day treatment had no effect on the survival,development,reproduction and longevity of offspring(P>0.05).Compared with the maternal single hot day treatment,the interaction of hot days and imidacloprid had different degrees of negative effects on the survival of offspring,and the decrease rate was up to 33.3%,but this negative effect did not extend to adult trait,and even had a positive stimulating effect on the longevity and fecundity of offspring,therefore had little effect on population parameters in offspring generation.In conclusion,these results will provide some theoretical guidance for predicting population dynamics and chemical control of S.avenae under the interaction of climate warming and pesticides.