Abstract
The objective was to determine the effect of essential oils on the mortality and repellency of the Tenuipalpus heveae Baker mite (Acari, Tenuipalpidae). Leaf discs of rubber trees were deposited in Petri dishes containing a moistened cotton layer. Posteriorly, the essential oils were diluted to formulate solutions, which were sprayed onto the discs. The experimental design was completely randomized, in a 3 × 4 factorial design: neem, cedar and clove oils at doses 0, 10 μL, 50 μL and 100 μL, with five replicates, with ten adult females being considered per replicate. The exposure to the effect of essential oil was evaluated after 24, 48, 72 and 96 hours for the number of females dead and females in the cotton. The data were submitted to analysis of variance, the values were transformed into (x + 0.5)1/2, and the means were grouped by the Scott-Knot test at 5% probability for the treatments, the doses were submitted to regression analysis. From the 48 hours of evaluation, clove oil showed greater potential for adult mite mortality, being 1.38 in 48 hours, 1.40 in 72 hours and 1.50 in 96 hours. The dose of 100 μL presented a greater potential for the neem and clove oils. The clove essential oil has potential in the control of Tenuipalpus heveae.
Highlights
IntroductionArg., Euphorbiaceae] is native to the Amazon Region
Pest and disease control are mainly done by zoning, use of resistant clones and by chemical control (Guyot & Le Guen, 2018, Vieira, Celoto, Scaloppi Junior, & Agustini, 2017)
The main pests occurring in regions with commercial rubber plantations in Brazil are phytophagous mites, especially Calacarus heveae Feres (Acari: Eriophyidae) and Tenuipalpus heveae Baker (Acari: Tenuipalpidae) (Juliatti, Fonseca, Carneiro, Juliatti, & Santos, 2018)
Summary
Arg., Euphorbiaceae] is native to the Amazon Region. Its cultivation is of great economic importance because it is the main source of natural rubber by the extraction of latex (Liu et al, 2015). The high latex yield is guaranteed by the environmental management associated with genetic improvement. Pest and disease control are mainly done by zoning, use of resistant clones and by chemical control (Guyot & Le Guen, 2018, Vieira, Celoto, Scaloppi Junior, & Agustini, 2017). The main pests occurring in regions with commercial rubber plantations in Brazil are phytophagous mites, especially Calacarus heveae Feres (Acari: Eriophyidae) and Tenuipalpus heveae Baker (Acari: Tenuipalpidae) (Juliatti, Fonseca, Carneiro, Juliatti, & Santos, 2018)
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