Influence of synthetic plant growth substances on the survivorship and developmental parameters of <Emphasis Type="Italic">Spilarctia obliqua</Emphasis> Walker (Lepidoptera: Arctiidae) |
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Authors: | G Gupta S R Yadav A K Bhattacharya |
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Institution: | (1) Department of Entomology, University of Minnesota, 230 Hodson Hall, 1980 Folwell Avenue, St. Paul, MN 55108, USA;(2) Department of Entomology, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263145, India |
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Abstract: | The nontarget effects of three plant growth stimulants (gibberellic acid, Siapton and triacontanol) and two plant growth retardants
(chlormequat chloride and mepiquat chloride) on the survivorship and developmental parameters of Spilarctia obliqua Walker (Lepidoptera: Arctiidae) were studied. For each compound, various concentrations (0.125×, 0.25×, 0.5×, × , 2× and
4×; × = labeled dose) bracketing the labeled dose were prepared by serial dilution and mixed with an artificial diet for the
insect. Gibberellic acid caused an increase in the larval period at × − 4×, but no marked difference was observed in the pupal
period or in larval survival at any concentration. Siapton induced a significant increase in larval period at the two highest
doses but caused significant reduction in pest survival at × − 4×. Interestingly, triacontanol induced a significant reduction
in pest survivorship at almost all doses. The LC50 for triacontanol was 0.206% and LT50 was 266.5 hours at the labeled dose. However, triacontanol did not cause any significant difference in larval or pupal periods
at any dose tested. Chlormequat chloride and mepiquat chloride caused significant reduction of larval survivorship at concentrations
higher than the labeled doses, and no effect on the larval period. Intriguingly, a significant reduction in pupal period was
observed with chlormequat chloride at × and 0.25×. Based on the marked effect of triacontanol on pest survivorship, this study
suggests incorporating triacontanol in integrated pest management modules for S. obliqua. Caution in the use of gibberellic acid and Siapton for pest infestations is also indicated. |
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Keywords: | Gibberellic acid Plant growth regulators Siapton Spilarctia obliqua Triacontanol |
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