Effects of lime sulfur on Neoseiulus californicus and Phytoseiulus macropilis, two naturally occurring enemies of the two-spotted spider mite Tetranychus urticae.

Autor: Vacacela Ajila HE; Department of Entomology, Federal University of Viçosa, Viçosa, Brazil., Oliveira EE; Department of Entomology, Federal University of Viçosa, Viçosa, Brazil., Lemos F; Econtrole Research & Consulting Ltda., Technological Center of Regional Development of Viçosa (CenTev), Federal University of Viçosa, Viçosa, Brazil.; Latin American Institute of Life and Nature Sciences (ILACVN), Federal University of Latin American Integration (UNILA), Foz do Iguaçu, Paraná, Brazil., Haddi K; Department of Entomology, Federal University of Lavras, Lavras, Brazil., Colares F; Econtrole Research & Consulting Ltda., Technological Center of Regional Development of Viçosa (CenTev), Federal University of Viçosa, Viçosa, Brazil., Marques Gonçalves PH; Department of Entomology, Federal University of Viçosa, Viçosa, Brazil., Venzon M; Agriculture and Livestock Research Enterprise of Minas Gerais (EPAMIG), Viçosa, Brazil., Pallini A; Department of Entomology, Federal University of Viçosa, Viçosa, Brazil.
Jazyk: angličtina
Zdroj: Pest management science [Pest Manag Sci] 2020 Mar; Vol. 76 (3), pp. 996-1003. Date of Electronic Publication: 2019 Oct 13.
DOI: 10.1002/ps.5608
Abstrakt: Background: The application of lime sulfur is a common practice used to control arthropod pests in organic production of fruits. However, the unintended effects of this insecticide preparation on non-targeted organisms have not received the adequate attention. Here, we evaluated the lime sulfur toxicity on the phytophagous mites Tetranychus urticae Koch (Acari: Tetranychidae) and on two predatory mite species [i.e., Neoseiulus californicus (McGregor) and Phytoseiulus macropilis (Banks)] (Acari: Phytoseiidae) of natural occurrence in strawberry plants. We also assessed the repellency and potential effects on the oviposition rates and the egg viability of mites that were exposed to field-used lime sulfur concentrations (i.e., 2%).
Results: The lime sulfur exhibited higher toxicity to the predators N. californicus (LC 50 = 5.4 [4.5%-6.8%]) and P. macropilis (LC 50 = 5.0 [4.0%-6.5%]) than to the phytophagous T. urticae (LC 50 = 12.4 [9.0%-17.1%]). However, the exposure to field-applied concentrations resulted in higher reductions on the oviposition rate of T. urticae (36%) than on the predatory mites (N. californicus = 18%. P. macropilis = 19%). Interestingly, although the egg viability of P. macropilis was less affected (i.e., reduction of 50%) by such lime sulfur exposures, these mites were unable to avoid lime sulfur-treated areas. Egg viability of N. californicus was only 18.6%.
Conclusion: Lime sulfur at field-applied concentrations harmed T. urticae fecundity and fertility and it showed selectivity against naturally occurring predatory mites, which reinforces its potential as a tool for integrated mite pest management. © 2019 Society of Chemical Industry.
(© 2019 Society of Chemical Industry.)
Databáze: MEDLINE
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