Acta Entomologica Sinica (1998) 41, S68-S75

Qingwen Zhang, Lihe Wang, Shuxia Yang, Qingnian Cai and Fan Zhang (1998)
[Influence of certain weather factors on dispersal distance of Trichogramma chilonis in a cotton field]
Acta Entomologica Sinica 41 (Suppl.), S68-S75
Abstract: Releasing experiments of the parasite, Trichogramma chilonis, for the control of the cotton bollworm Helicoverpa armigera were conducted in cotton fields in Yucheng, Shandong Province in 1994 and 1995. The results indicated that: the effective dispersal distance (EDD) of T. chilonis was positively related to both the length of sunshine and the average field temperature (AFT) during the releasing periods. When the temperature was higher than 24°C, most of the patasites dispersed beyond 25 m and when it was lower than 20.7°C, all of them distributed within 1-25 m. During June-August, their EDD varied from 10 m to 25 m. Rainfall severely influenced their EDD and parasitizing rate. EDD of the egg parasite showed a significant negative correlation with the field relative humudity (FRH), when FRH was above 89 % their EDD became greatly shortened and most of them distributed near the releasing site.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Qing-Nian Cai

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
transmission/dispersal

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa armigera	Cotton (Gossypium)	China (NE)
Trichogramma chilonis (parasitoid)	Helicoverpa armigera	Cotton (Gossypium)	China (NE)