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Marcic D 《Experimental & applied acarology》2007,42(2):121-129
Laboratory bioassays were conducted to evaluate the effects of spirodiclofen on life history and life-table parameters of
two-spotted spider mite (Tetranychus urticae Koch) females treated at pre-ovipositional period with a series of acaricide concentrations starting with the concentration
discriminative for eggs and immatures i.e. the lowest concentration that causes 100% mortality of those stages. After a 24 h
exposure, the proportion of females that survived treatments was 0.71 (6 mg/l), 0.51 (12 mg/l), 0.41 (24 mg/l), 0.30 (48 mg/l)
and 0.25 (96 mg/l). At the end of the trial, the survival rate of females treated with the lowest concentration was significantly
lower than the survival rate of untreated females but it remained above that of females treated with higher concentrations.
Total fecundity/fertility significantly decreased as concentrations of spirodiclofen increased. Viable eggs were laid by females
treated with 6, 12 and 24 mg/l, and total fertility was reduced by 42, 84 and 97%, respectively. Compared with control, the
gross fecundity/fertility of the treated females was significantly reduced throughout the trial, except in females treated
with 6 mg/l. All concentrations caused a significant reduction in the net fecundity/fertility throughout the trial. The females
treated with 12 mg/l had significantly reduced net reproductive rate (R
0 = 6.45), compared to females treated with 6 mg/l (R
0 = 23.35) and to untreated females (R
0 = 28.92); there was no significant difference between the last two treatments. The intrinsic rate of increase (r
m
) and finite rate of increase (λ) were significantly reduced in treated females (r
m
= 0.141, λ = 1.156 and r
m
= 0.214, λ = 1.232; 12 and 6 mg/l, respectively), compared to control (r
m
= 0.251, λ = 1.276). The reduction was significantly greater in females treated with the highest concentration. As a result of the lowered
r
m
, the doubling time in treated females was significantly extended. Sublethal effects of spirodiclofen and its impact on T. urticae management are discussed. 相似文献
2.
We have developed baseline susceptibility values for four new acaricides: bifenazate, acequinocyl, spirodiclofen and etoxazole
for eggs or adult females of a susceptible laboratory population of Panonychus ulmi (Koch) (Acari: Tetranychidae). Further, we have tested diagnostic concentrations of each acaricide against populations resistant
to organochlorine, organotin or IGR-type acaricides. Resistance to etoxazole (ca. 4-fold) was identified in populations resistant
to the IGRs clofentezine and hexythiazox.
*The Canadian Crown’s right to retain a non-exclusive, royalty-free licence in and to any copyright is acknowledged. 相似文献
3.
Steven Van Pottelberge Jahangir Khajehali Thomas Van Leeuwen Luc Tirry 《Experimental & applied acarology》2009,47(4):301-309
In this study the reproductive capacity of a laboratory-selected spirodiclofen resistant strain was investigated after treatment
with spirodiclofen. Firstly, females were exposed to different concentrations of spirodiclofen (200 and 1,000 mg/l) during
6, 12 or 24 h. In contrast to the susceptible parental strain, the fecundity and fertility of resistant mites was not affected
by treatment with these concentrations after any time of exposure tested. Secondly, pre-treatment of the resistant females
with the synergists PBO or DEF could increase the inhibitory effect of spirodiclofen on reproduction, demonstrating the possible
involvement of monooxygenases and esterases in metabolic detoxification of the acaricide. Because spirodiclofen interferes
with lipid biosynthesis, total lipid content was measured in female adults. There were no significant differences between
treated and non-treated female adults, both in the susceptible and resistant strain. However, the total lipid content in the
resistant females was significantly higher than in susceptible females. Our data shows that the detection of spirodiclofen
resistance should not be limited to mortality bioassays with eggs or larvae, but should be combined with inhibitory studies
on female fertility and fecundity. 相似文献
4.
《Archives Of Phytopathology And Plant Protection》2012,45(9-10):938-952
AbstractThe two-spotted spider mite, Tetranychus urticae Koch is one of the most common pests of agricultural crops. The use of sublethal doses can reduce the need of pesticides and prevent pests’ resistance, which is an important step in integrated pest management and safely controlling this pest. The sublethal effects (LC5, LC15 and LC35) of spirodiclofen on demographic parameters of T. urticae based on the age-stage, two-sex life table theory were investigated under laboratory conditions [25?±?2?°C, 60?±?5% RH and 16:8 (L:D) h]. The longevity, total life span, oviposition period and total fecundity reduced after exposure to LC15 and LC35. Oviposition period ranged from 5.64 to 10.92?days. The gross reproduction rate (GRR), net reproductive rate (R0) and the finite rate of increase (λ) of the mites treated with LC15 and LC35 were inferior to the results when treated with LC5, and control. The values of intrinsic rate of increase (r) was 0.2209?day?1 in the control and this was reduced to 0.1714?day?1 in LC35. Based on these results, considering the negative impact of spirodiclofen on the population growth of T. urticae, this acaricide can be helpful to achieve an efficient control for T. urticae in frame of integrated pest management. 相似文献
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