عنوان مجله
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EXPERIMENTAL AND APPLIED ACAROLOGY
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چکیده
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Two-spotted spider mite, Tetranychus urticae Koch, is one of the economically
most important pests on a wide range of crops in greenhouses and orchards worldwide.
Control of T. urticae has been largely based on the use of acaricides. Sublethal effects of
spirodiclofen, pyridaben and abamectin were studied on life-table parameters of T. urticae
females treated with the acaricides. LC25
values of spirodiclofen, abamectin and pyridaben
(3.84, 0.04 and 136.96 μg a.i./ml, respectively) were used for sublethal studies. All acaricides
showed significant effects on T. urticae biological parameters including developmental
time, survival rate, and fecundity. The females treated with spirodiclofen, abamectin
and pyridaben at LC25
exhibited significantly reduced net reproductive rate (
R0), finite rate
of increase (λ) and intrinsic rate of increase (r). The intrinsic rate of increase in spirodiclofen,
abamectin and pyridaben treated groups and control were 0.0138, 0.0273, 0.039
and 0.2481 female offspring per female per day, respectively. The results indicated that
sublethal concentrations of tested pesticides strongly affected the life characteristics of spider
mite and consequently may influence mite population growth in future generations.
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