The effects of spirotetramat on life history traits and population growth of Tetranychus urticae (Acari: Tetranychidae)

Abstract

The effects of spirotetramat, a tetramic acid derivative, on gross fertility, net fertility, female longevity and the instantaneous rate of increase of two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae) were investigated after treatment of female teleiochrysalises (the first assay) and pre-ovipositional females (the second assay). Spirotetramat was applied to the leaf discs by Potter spray tower and the following series of concentrations was applied: 200, 60, 18, 5.4 and 1.62 mg/l. In both assays after 24 h of exposure, surviving females without symptoms of poisoning were used for further procedure. In the first assay, gross fertility of treated females was reduced by 2.4-64.7% and net fertility by 12.4-88.8%, compared to the control. Gross fertility of the females treated with 1.62 and 5.4 mg/l did not significantly differ from the control, whereas all concentrations, except the lowest, significantly reduced net fertility and female longevity. Treatments with 200, 60, and 18 mg/l significantly reduced the instantaneous rate of increase. In the second assay, gross fertility and net fertility were reduced by 43.7-93.3% and 73.8-98.5%, respectively. All concentrations, except the lowest, significantly reduced gross fertility, whereas net fertility and longevity in all treated females were significantly lower compared to the control. All concentrations, except the lowest, significantly reduced the instantaneous rate of increase, provided that concentrations of 200, 60 and 18 mg/l caused population decline. The effects of spirotetramat and its impact on T. urticae management are discussed.

Spirotetramat resistance adaption analysis of Aphis gossypii Glover by transcriptomic survey

“…Spirotetramat has been registered in China under the trade name Movento to control a range of sucking insects, including aphids. Acting as an inhibitor of acetyl-CoA carboxylase (ACC), spirotetramat can cause a significant reduction in total lipid biosynthesis [8]. Because of its novel mode of action, spirotetramat lacks cross-resistance to existing chemical classes of insecticides and will be an invaluable new tool for managing the insecticide resistance of cotton aphids.…”

Over-expression of CYP6A2 is associated with spirotetramat resistance and cross-resistance in the resistant strain of Aphis gossypii Glover

“…Spirotetramat is an inhibitor of acetyl-CoA carboxylase (ACC) and causes a significant reduction in total lipid biosynthesis in a manner similar to the tetronic acid derivatives spirodiclofen and spiromesifen [9][10][11]. Spirotetramat has been registered in China since 2011 under the trade name Movento and is applied as a foliar spray to control a range of sucking insects including aphids.…”

Novel mutations and expression changes of acetyl‐coenzyme A carboxylase are associated with spirotetramat resistance in Aphis gossypii Glover

“…Spirotetramat, an inhibitor of ACC that is a spirocyclic tetronic/ tetramic acid derivative, is a systemic insecticide developed for the control of sucking pests, including aphids (Br€ uck et al, 2009;Nauen et al, 2012). It is similar to the tetronic acid derivatives spirodiclofen and spiromesifen and can cause a significant reduction in total lipid biosynthesis by inhibiting ACC (Van Pottelberge et al, 2009;Khajehali et al, 2011;Marcic et al, 2012). Spirotetramat is instantly transformed into spirotetramat-enol in the plant after leaf uptake and is distributed throughout the plant owing to the insecticide's favourable physicochemical properties.…”