Desequilíbrio Biológico Do Ácaro-Rajado Tetranychus Urticae Koch, 1836 (Acari: Tetranychidae) Após Aplicações De Inseticidas Em Algodoeiro

Barros, Ricardo; Degrande, Paulo Eduardo; Soria, Miguel Ferreira; Ribeiro, Jéssica Souza

doi:10.1590/1808-1657v74p1712007

Cited by 4 publications

(1 citation statement)

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“…Among the inappropriate insecticides are pyrethroids, which according to Degrande (1998), may contribute to spider-mite outbreaks, causing instability, increasing their incidence on plants, and increasing the severity of symptoms caused by the mites (Barros et al, 2007). According to Degrande (1998), in studies with cotton, the increased population of spider mites is caused by the mortality of their natural enemies, dispersal, stimulation of spider-mite reproduction, physiological and nutritional changes in the plants, and the repellant effect on predators.…”

Section: Introductionmentioning

confidence: 99%

Damage level of the two-spotted spider mite Tetranychus urticae Koch (acari: tetranychidae) in soybeans

et al. 2012

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Among phytophagous spider mites, the two-spotted spider mite Tetranychus urticae Koch, 1836 is one of the most important agricultural pests, not only because of the damage it causes, but also because it has a wide host range, infesting many commercial crops such as leafy greens, cotton, beans, and soybeans, among others. This study was carried out in a greenhouse of the Faculdade de Ciências Agrárias (FCA) of the Universidade Federal da Grande Dourados (UFGD), located in the city of Dourados, state of Mato Grosso do Sul. The experiment was arranged in a randomized block design with 5 treatments and 4 replicates. The treatments consisted of 5 levels in percentage of chlorotic symptoms (indicating mite damage): 0%, 25%, 50%, 75%, and 100%. All of the characteristics evaluated, except for number of pods per plant, the number of seeds per plant, the total weight (productivity), and the weight of 1000 seeds, were significantly influenced by the different levels of chlorotic symptoms. The economic damage level for the two-spotted spider mite Tetranychus urticae, according to the equation y = 66.63-0.51 x, based on the price of US$ 11.00 per bag of soybeans and a control cost of US$ 16.00, would be 15.80% chlorotic symptoms. At a price of US$ 29.00 per bag with the same control cost, the economic damage level would be 13% of chlorotic symptoms.

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Section: Introductionmentioning

confidence: 99%