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Abstract

The methods currently used to assess orchard infestation are time-consuming and do not take into account non-adult forms of mites, due to their small size. Advance in digital imaging technology, however, has resulted in the discovery of a more viable method to enable a fast and reliable assessment of orchard infestation. Digital images of infected apple leaves were made and examined for the presence of European red mites and two-spotted spider mites. As well as adult mites, non-adult European red mite forms were also encountered. After extracting all objects considered as mites from the image, imaging software was then used to assess their dimension and shape parameters. Length, width, area, and equivalent diameter were different for all three observed mite groups: adult female European red mites, possible non-adult European red mites and adult two-spotted spider mites. Differences in circularity and elongation were found in adult two-spotted spider mites and various forms of European red mites, while the perimeter was similar in adult European red mites and two-spotted spider mites, and different in the non-adult forms of European red mites. However, as the ranges of 95% prediction intervals for these features overlap, a combination of at least two features as well as employing statistical procedures may greatly increase the probability of appropriate classification of the observed objects as different mites.

Results on the Efectiveness of Plant Protection Products Tested at the Fruit Growing Research and Development Station Iaşi, Romania

During 2010-2011, at the Fruit Growing Research and Development Station (FGRDS) Iaşi, Romania, were carried aut research on testing the effectiveness of plant protection products. The experiment was conducted in experimental polygon, in an apple orchard, the variety Idared. Pests on witch observations were made were: Cydia pomonella L., Adoxophyes reticulana, Panonychus ulmi, Phyllonorycter spp., and the products tested were: Affirm SG 095 and Voliam Targo SC 063. The products Affirm SC 095 was tested against the apple skin moth (Adoxophyes reticulana) and apple codling moth (Cydia pomonella L.), and the product Voliam Targo SC 063 was tested against red mites (Panonychus ulmi) and the leaves miners (Phyllonorycter spp.) apple codling moth (Cydia pomonella L.). As standard products Coragen and Vertimec 1.8 EC were used at the rates of 0.15 l/ha and 0.75/ha respectively.

. 97–100. [in Polish] Nauen R., Stumpf N., Elbert A., Zebitz C.P.W., Kraus W. 2001. Acaricide toxicity and resistance in larvae of different strains of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae). Pest Management Science 57: 253–261. DOI: 10.1002/ps.280. Navajas M., Perrot-Minnot M.J., Lagnel J., Migeon A., Bourse T., Cornuet J.M. 2002. Genetic structure of a greenhouse population of the spider mite Tetranychus urticae : spatio-temporal analysis with microsatellite markers. Insect Molecular Biology 11: 157–165. DOI: 10.1046/j.1365