Acta Entomologica Sinica (1997) 40, 113-121

Youjun Zhang, Xilai Han, Wenji Zhang, Liner Luo and Peiai Zhou (1997)
[An electrophysiolgical study on resistance to pyrethroid insecticides in Helicoverpa armigera (Hübner)]
Acta Entomologica Sinica 40 (2), 113-121
Abstract: The effects of pyrethroids fenvalerate and permethrin were studies upon isolated abdominal nerve cords from the susceptible (HD-S) and resistant (HJ-R) strains of Helicoverpa armigera (Hübner). 10^-5 mol/L fenvaterate and 10^-5 mol/L permethrin induced increases in spontaneous firing frequency primarily and then led to cessation in both strains; 10^-4 mol/L permethrin blocked the neural activity directly without producing repetitive discharges. On the basis of the time of excitation or cessation, there was a consistent pattern showing that the nervous system of HJ-R is 2~3 times more resistant to pyrethroid actions than that of HD-S. This experiment implied that there is a resistant mechanism of decreased nervous sensitity to pyrethroids in the field strain of Heliothis armigera in China and the mechanism conferred resistance to type I or II pyrethroids.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Helicoverpa armigera