Artofer, R., 1976.
Spider-mites in vine cultivation. Pflanzenarzt, 29: 73.
Abstract
Vineyards in the Austrian Burgenland, especially those near the Neusiedler See, are usually infested by Panonychus ulmi (Koch), Tetranychus urticae Koch, but the 2 species are not found on the same food-plant. Two examples are given: in one plot, P. ulmi attacked the vines and T. urticae infested the weeds growing beneath them, and in another plot where T. urticae had overrun vines, brambles and weeds, P. ulmi confined itself to a nearby pear tree. In March 1976 it was therefore surprising to find both species (P. ulmi as winter eggs and T. urticae as hibernating females) overwintering near each other under the bark of the same vines. The winter eggs of P. ulmi were also distributed over a much wider area than had previously been recorded for this species in the region. Both tetranychids were more numerous than in former years, probably owing to the side-effects of certain insecticides applied on vines. Control, which thus becomes more necessary, is completed in the winter by the presence of the 2 species together on vines, since winter eggs and overwintering females have previously been thought to require different types of treatment.
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