Abstract:

The adults of Dastarcus helophoroideswere reared in grooves of wood blocks, and their eggs were preserved at 5 ℃ to maintain the egg viabilities of D. helophoroides. This study observed the behavior and parasitical rates of newly hatched larvae of D. helophoroides to larvae of Anoplophora glabripennis, and compared the control effect to A. glabripennis between releasing D. helophoroideseggs in forests and injecting a pesticide, Omethoate, in trunks. The results showed hatching rates of D. helophoroides eggs preserved in low temperature for 49 d had no difference from those of newly laid eggs. First instars larva of D. helophoroides survived 1～8 d in laboratory, with an average of 2.26 d.Crawling speed of a larva was 65～100 cm·h^－1, on average of 2523 cm·h^－1. Newly hatched larvae released in both laboratory and forest could find and parasitize their hosts. With proper temperature and humidity environment, the parasitical rate could reach 90% if releasing 15～20 D. helophoroideseggs per one A. glabripennis larvaThe population of A. glabripennis declined more than 85% after both releasing eggs of D. helophoroides in forests and injecting the pesticide in trucks. It was proved there was no difference in control effect to A. glabripennis between the two methods.

Key words: Dastarcus helophoroides eggs, Anoplophora glabripennis, releasing, control effect