马尾松花粉仓贮害虫印度谷螟的生物学特性

研究了马尾松花粉重要仓贮害虫印度谷螟的生物学特性。结果表明,印度谷螟在浙江省富阳市1年发生5代,以成熟幼虫散居包装箱、家具、室内墙角等缝隙和纸张等堆积物间越冬。成虫、幼虫行动极其敏捷,能迅速从存贮被害物的器物空隙中溜飞、爬离,扩散蔓延能力较强。越冬代成虫羽化呈现次高峰期、主高峰期两个高峰期,分别为5月12—13日和22—23日。第1、2、3和4代成虫的羽化高峰期分别为7月3—4日、7月28—29日、8月27—29日和10月5—6日。雌、雄成虫平均交配时间为75.8 min·次-1。交配当天,雌成虫即可产卵,每头雌成虫平均产卵量为128粒。成虫平均寿命8.0天,雌雄性比为1.0︰1.2。卵平均历期为4.9天。成熟幼虫平均爬行速度为25.2 cm·min-1,直线型爬行占总虫数的62.5%。每头幼虫平均取食花粉片的质量为0.055 g。幼虫食物缺乏或成熟时,迁移寻觅新食源或隐蔽场所化蛹。蛹平均历期为9.9天。

Biological Characteristics of Storage Pest Plodia interpunctella of Masson Pine Pollen

The Indian meal moth(Plodia interpunctella) is the major economic insect pest of stored Masson pine pollen products.This paper deals with the biological characteristics of the insect feeding Masson pine pollen.By one-year’s observation on P.interpunctella in Fuyang City of Zhejiang Province,it is found that the P.interpunctella reproduces five generations per year and the mature larvae hide in gaps of deposits such as boxes,interior wall,furniture and paper packing for overwintering.Both the adult and larvae behavior are of extremely agile and can quickly fly or climb away from the store materials,with strongly spreading ability.Overwintering adult emergence shows two main peak periods in May 12-13 and May 22-23 respectively.The adult emergence peaks of the first,the second,the third and the fourth generation are July 3-4,July 28-29,August 27-29 and October 5-6 respectively.The average mating duration of adult is 75.8 minutes per time.The female adult lays eggs after mating and the average amount is 128 eggs per female.The mean life of adult is 8.0 days and female-male ratio is 1.0: 1.2.The average duration of eggs is 4.9 days.The mean crawling speed of the mature larvae is 25.2 cm.min-1,and the number of straight crawling insects occupies 62.5% of the total.Feeding of per larva is 0.055g of pine pollen tablet.The larvae migrate to find new food sources when lack of food or to find hidden places to pupate as maturing.The average pupating duration takes 9.9 days.