Systematic and Applied Acarology (2021) 26, 2118-2132

Sabrina Jahan Rimy, Gopal Das, Tetsuo Gotoh and Mohamamd Shaef Ullah (2021)
Lethal and sublethal effects of bifenazate on the biological parameters of Tetranychus truncatus Ehara (Acari: Tetranychidae)
Systematic and Applied Acarology 26 (11), 2118-2132
Abstract: Tetranychus truncatus Ehara (Acari: Tetranychidae) is one of the serious pests that infests different agricultural crops in field and greenhouse crops, and its distribution is limited to mostly Asian countries. The experiments were conducted to know the effectiveness of different concentrations of bifenazate against the T. truncatus, and to evaluate and compare the demographic parameters of T. truncatus on host plant Lablab purpureus (L.) Sweet (Fabaceae), which were obtained from females treated with bifenazate. The LC₁₅, LC₃₀, LC₅₀ and LC₉₀ values are determined through the bioassay from the results of the first application of bifenazate on adult females of T. truncatus. The LC₁₅, LC₃₀, LC₅₀ and LC₉₀ concentrations of bifenazate were 0.417, 1.028, 2.591 and 24.792 ml/ l, respectively. The response of adult females against the two lethal concentrations (LC₁₅ and LC₃₀) was mostly alike but had a little bit difference. The differences in life table parameters were observed between control and treated spider mites. The results demonstrated that LC₁₅ and LC₃₀ of bifenazate could reduce the survival rate, oviposition period, fecundity and longevity of females of T. truncatus and it significantly affected the developmental times, especially larval duration and fecundity of T. truncatus. Life-table parameters of T. truncatus were much reduced in LC₁₅ and LC₃₀ compared to the control and their growth and other factors showed significant differences. The present study showed that the lower lethal concentration (LC₁₅ and LC₃₀) of the tested acaricide showed negative effects on survivorship and life-table parameters of the subsequent generation of T. truncatus.
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Database assignments for author(s): Tetsuo Gotoh

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus truncatus	Jute (Corchorus)	Bangladesh
	Tetranychus truncatus	Hyacinth bean (Lablab purpureus)