The temporal development of biological control of arthropod pests in perennial cropping systems is largely unreported. In this study, the development of biological control of twospotted spider mite, Tetranychus urticae Koch, and hop aphid, Phorodon humuli (Schrank), in a new planting of hop in Oregon is described over a period of 9 yr (2005-2013). Both the abundance and diversity of natural ene...

x. The toxicity and action offluenethyl or 2-fluoroethyl(4-biphenylyl ) acetate, several other monofluoroethyl esters, monofluoroethanol, monofluoroacetic acid and fluoroacetamide were studied in mice, houseflies (Musca dornestica L.) and twospotted spider mites (Tetranychus urticae Koch). 2. Toxicity varied markedly with the test compound, method of application and biological species. Generall...

The use of a standardized beat sampling method for estimating spruce spider mite, Oligonychus ununguis (Jacobi) (Acari: Tetranychidae), densities on a widely used evergreen ornamental plant species, Juniperus chinensis variety 'Sargentii' A. Henry (Cupressaceae), was examined. There was a significant positive relationship between total spruce spider mite densities and spider mite densities from...

lations sometimes develop. Such variations are apparently the result of predators and parasites, climatic differences, varying tree conditions such as tree vigor and the plant growth cycle, all o€ which affect the feeding mites. The effects of temperature and humidity were the only considerations in the study reported here. Climatological conditions were found to vary from grove to grove and fr...

Leprosis is a serious disease of citrus caused by Citrus leprosis virus C (CiLV-C, genus Cilevirus) whose transmission is mediated by false spider mites of the genus Brevipalpus. CiLV-C infection does not systemically spread in any of its known host plants, thus remaining restricted to local lesions around the feeding sites of viruliferous mites. To get insight into this unusual pathosystem, we...

The twospotted spider mite, Tetranychus urticae Koch, is a worldwide pest of numerous agronomic and horticultural plants. Sulfur fungicides are known to induce outbreaks of this pest on several crops, although mechanisms associated with sulfur-induced mite outbreaks are largely unknown. Studies were conducted during 2007-2009 in Oregon and Washington hop yards to evaluate the effect of timing ...

Twelve larvae of unidentified species of Odontacarus Ewing, 1929 (Acari: Leeuwenhoekiidae) were found parasitising an adult male whip spider Charinus brasilianus Weygoldt (Charinidae) in Santa Teresa, mountainous region of Espirito Santo state, southeastern Brazil. These larvae occurred in the intersegmental membrane of prosoma and legs. This is the first report of ectoparasitic mites infecting...

The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most polyphagous herbivores feeding on cell contents of over 1100 plant species including more than 150 crops. It is being established as a model for chelicerate herbivores with tools that enable tracking of reciprocal responses in plant-spider mite interactions. However, despite their important pest sta...

during a faunistic survey of natural enemies of spider mites of genus tetranychus in mashhad and vicinity, a predatory gall midge species belonging to the family cecidomyiidae was collected and identified as feltiella acarisuga vallot. f. acarisuga is one of the ten species in the genus feltiella and an important biological control agent of tetranychid mites has previously been reported from va...

There are several types of spider mites, some which specialized to feed on certain crops, and they a major nuisance in agriculture. Predatory insects such as golden-eyes, semi-hardwings, cockroaches, predatory can successfully reduce the number mites. The type crop particular mite species have an impact how successful these predators are. Spider mites frequently encountered agricultural pest, t...