Abstract
The relationships between population densities ofCalepitrimerus vitis (Nalepa),Colomerus vitis (Pagenstecher) andTetranychus urticae (Koch), and grape weight and sugar content were studied during 3-year-long trials. In the case ofCalepitrimerus vitis, the influence of population density on leaf area, length of spring shoots and number of grapes in the following year was studied. Significant relationships between population densities of bothCalepitrimerus vitis andT. urticae in late summer and grape weight were determined. The sugar content of the grapes was markedly less influenced by mite infestation. The negative effect ofColomerus vitis on grape weight was not confirmed. Significant relationships for crop-protection decisions are presented.
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