Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro

Lavras, Brazil

Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro

Lavras, Brazil
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de Souza-Pimentel G.C.,Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro | de Souza-Pimentel G.C.,Federal University of Lavras | Reis P.R.,Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro | da Silveira E.C.,Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro | And 5 more authors.
Revista Colombiana de Entomologia | Year: 2014

The two-spotted spider mite, Tetranychus urticae (Tetranychidae), is an important pest in rosebush (Rosa spp.), currently controlled by using agrochemicals. Phytoseiidae mites are used for biological control of pest mites. This study aimed to evaluate the biological control of the T. urticae on rosebushes grown in greenhouse after releases of the predatory mite Neoseiulus californicus (Phytoseiidae). In addition, the selectivity of some agrochemicals for disease and mite control was tested. Three experiments were conducted in a completely randomized design using potted roses. Twenty females per plant of the two-spotted spider mite were placed for infestation. After nine days, 0 to 14 predatory mites per plant were released. After 15 days a new release was made in one of the experiments. Predation was assessed one month after release by randomly collecting rosebush leaves from the apical, medial and basal regions, and the number of living T. urticae was counted. Selectivity was studied by using the laboratory method of residue spraying on a glass surface. Products were sprayed in a Potter tower with the highest doses recommended for the products. The number of live females and eggs laid by the predatory mite were evaluated. It was concluded that N. californicus is efficient in controlling the T. urticae under greenhouse conditions. The mineral oil, acephate, tebuconazole, iprodione, fenpropathrin and abamectin showed to be slightly harmful to the predator and could be used for integrated control. On the other hand, fenpyroximate was highly toxic to the predator mite. © 2014 The American Society for Cell Biology.


PubMed | Empresa de Pesquisa Agropecuaria de Minas Gerais EPAMIG Sul de Minas EcoCentro
Type: Journal Article | Journal: Brazilian journal of biology = Revista brasleira de biologia | Year: 2014

The predatory mite, Neoseiulus californicus (McGregor, 1954) (Acari: Phytoseiidae) is one of the principal natural enemies of tetranychid mites in several countries, promoting efficient control of those mites in several food and ornamental crops. Pest attacks such as that of the spider mite, Tetranychus urticae Koch, 1836 (Acari: Tetranychidae), is one of the problems faced by farmers, especially in the greenhouse, due to the difficulty of its control with the use of chemicals because of the development of fast resistance making it hard to control it. The objective of this work was to study the life history of the predatory mite N. californicus as a contribution to its mass laboratory rearing, having castor bean plant [Ricinus communis L. (Euphorbiaceae)] pollen as food, for its subsequent use as a natural enemy of T. urticae on a cultivation of greenhouse rosebushes. The studies were carried out in the laboratory, at 25 2C of temperature, 70 10% RH and a 14 hour photophase. The biological aspects and the fertility life table were appraised. Longevity of 32.9 days was verified for adult females and 40.4 days for males. The intrinsic rate of increase (rm) was 0.2 and the mean generation time (T) was 17.2 days. The population doubled every 4.1 days. The results obtained were similar to those in which the predatory mite N. californicus fed on T. urticae.

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