贵阳地区黄刺蛾种群发生规律及防治策略

黄刺蛾Monema flavescens Walker是贵阳地区的园林树木的重要害虫。种群年生活史同时存在1年1代和1年2代现象,其中1年1代的个体数占大多数,大约占虫口总数的3/4。1世代或2世代的个体越冬后的成虫羽化都集中于5月中、下旬;茧内滞育虫态(含预蛹和蛹)长达8～10个月;寄生性天敌昆虫对越冬代有很强的自然控制力,冬季茧的平均寄生率达34%。成虫的黑化个体占2.75%。室内养虫笼中黄刺蛾产下的卵粒有3种形状。研究期间(2004～2007年)发现黄刺蛾在贵阳的寄主植物有所不同,认为不同年份嗜食寄主植物有明显不同。根据黄刺蛾在当地的发生规律及天敌的自然控制力,提出了相应的防治策略和建议。

Population occurrence and control strategy of Monema flavescens in Guiyang

Monema flavescens Walker is a serious pest of garden trees in Guiyang.There was both one generation and two generations in its life history each year,in which about 3/4 of the total individuals occurred one generation each year.The adults from both one-generation and two-generation emerged in the last 20 days of May.The diapause stage,including prepupa and pupa in conoon,lasted for 8～10 months.Parasitic natural enemy of M.flavescens showed higher controlling effect,as the average parasitic rate of overwintering pupae was 34%.The melanous rate of adults was 2.75%.Three shapes of egg were found in insect cage(40 cm×30 cm×50 cm).During the study period(2004～2007),the host plants of M.flavescens were different in different year.Based on the occurrence and natural control,some control strategy and suggestions were mentioned.