黄连木种子小蜂的发生与防治研究

黄连木种子小蜂在安徽省1～3年发生1代,但均以老熟幼虫在被害果内越冬。翌年4月中下旬化蛹,蛹期10～15d,5月上中旬至6月上旬成虫羽化,成虫在果壳内滞留3～5d,出壳后交尾产卵,寿命达4～15d。每雌产卵25～47粒,卵期3～5d。幼虫5月中下旬孵化,幼虫共5龄,初孵幼虫取食胚外海绵组织,食量少而生长缓慢,1龄期长达65～75d,当种胚膨大、子叶开始发育时,幼虫钻入胚内取食子叶和胚乳,此时2～5龄为快速生长期,仅20～25d,当子叶被食光后,幼虫老熟,进入休眠阶段,在被害的空果壳内越冬,分别于第2、第3或第4年羽化外出。

A Research on Occurrence and Control of Eurytoma Plotnikvi

Eutytoma Plotnikvi is 1 - 3 years in Anhui Province. The matured larva overwintered in the fruit. It pupated in the mid-ten day and the last ten-day of April, the pupae stage is 10 - 15 days, then the time for the adult＇ s emergence is from the first ten-day and the mid ten-day of May to the first ten-day of June. The adult got out of the shell after having stayed there for 3 - 5 days and then copulates and lay eggs. The adult can live up to 4 - 15 days. A female adult lays 25 -47 eggs. The egg stage is 3 - 5 days. The larva begins to hatch in the mid ten-day and the last ten-day of May, it can be divided into 5 stages, newly hatched larva takes extra-embryonic Spongy tissue as its food. In stage 1, which lasts 65 - 75 days, it has a small appetite and are slow-growing. When embryo expands and the seed leaf starts growing, the larva drills into the embryo to eat seed leaf and the endosperm. From stage 2 to stage 5, which last just 20 - 25 days, the larva grows the most fast. After the seed leaf is eaten up, larva becomes the adult. The larva moves onto the dormant stage to survive the winter in the victim＇s empty shell and goes out to emergence in the second, third or fourth year.