Systematic and Applied Acarology 2004

Systematic & Applied Acarology
ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996

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Systematic & Applied Acarology (2004) 9, 27-32
Action mechanism and biological activity of celangulin to Tetranychus cinnabarinus (Acari: Tetranychidae)

WEI DING¹, ZHIMO ZHAO¹, WENJUN WU², HUIYING TAO¹& JINJUN WANG¹
^{1 College of
plant protection, Southwest Agricultural University, Chongqing 400716,China;
e-mail: dwing818@yahoo.com.cn
^{2 College of
plant protection, Northwest Agricultural University, Yangling, Shanxi 712100,
China
Abstract
The insecticidal activity of 2% Celangulin
E.C against some populations of Tetranychus cinnabarinus, including a
susceptible strain (SS), a fenpropathrin-resistant strain (FeR) and an
abamectin-resistant strain (AbR), was studied. Laboratory bioassays indicated
that the toxicity of celangulin against the SS strain was highest, its LC₅₀being 1.3883mg/L, compared with pyridaben (53.8446mg/L) and omethoate
(116.0337mg/L), and the toxicity of celangulin against FeR (LC₅₀=1.3825mg/L)
was almost the same as that of the SS strain, i.e. there was no cross
resistance between celangulin and fenpropathrin. But the toxicity of
celangulin against AbR (LC₅₀=6.9203mg/L) was inferior to that
against SS, and its LC₅₀ value increased 4.98-fold, which showed
that some cross resistance existed between celangulin and abamectin. The
effect of celangulin E.C against T. cinnabarinus was higher than
pyridaben and omethoate in a potted plant experiment. The dose of the
celangulin’s active ingredient that was needed to obtain 95% mite mortality
was 1/40 of pyridaben and 1/60 of omethoate. In addition, carboxylesterase
(CarE) activity inhibited by celangulin was correlated with the action
mechanism of celangulin on T. cinnabarinus. Celangulin can therefore be
used to control T. cinnabarinus, which harms vegetables, cotton and
other agricultural crops.

Key words:
Celangulin; Tetranychus cinnabarinus; bioactivity; laboratory bioassay.

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Last updated 31 July 2004

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