烟草码绢金龟生活史及生活习性研究

 码绢金龟Maladera sp.是烟草上的一种重要食叶害虫。对码绢金龟生物学特性的研究国内外还未见报道。本文通过1996～1998年的田间系统调查和室内饲养,弄清了码绢金龟的生活史、各虫态生活习性。在昆明,码绢金龟一年发生一代,以3龄幼虫在土中做土室越冬。越冬幼虫第2年4月上旬开始化蛹,4月中旬是化蛹盛期,4月下旬为化蛹末期,蛹期平均为21d。成虫5月上旬开始羽化出土,5月中旬进入羽化盛期,5月下旬为羽化末期。6月中旬至下旬为成虫发生为害盛期,成虫发生期约80d左右。田间成虫产卵盛期是6月下旬至7月上旬,每雌产卵量平均为27粒。7月上旬至中旬是卵孵化盛期,卵期平均为14.4d。幼虫发育至第2年4月,幼虫期约280d。土壤温度影响幼虫在土层中的栖息深度。

Study on the Bionomics and Habit of Maladera sp

The life cycle and habit of Maladera sp were studied in yunnan province from the year of 1996 to 1998.There is one generation a year and overwintering in the third instar in soil.The maximum pupation of the third instar occurres on the second decade of April and the average stage of the pupae is 21 days Adult emergene from the first to the last decade of May The peak of the laying in soil occurres from the last decade of Jun to the first decade of July.The average stage of egg is 14 4 days.The adult has a habbit of feigning death.The damage stage of the adult is 80 days.The larval stage is possessing three instars.and the total larval stage lasts for 280 days.The vertical distribution of larvae in the soil is affected by the soil temperature.