Vertical dispersion of twospotted spider mites on hops throughout the growing season
Keywords:
twospotted spider mites, <i>Tetranychus urticae</i>, hopsAbstract
Studies were conducted in 1968 and 1982 to determine the vertical dispersion of twospotted spider mites, <i>Tetranychus urticae</i> Koch, on hops during the growing season. Data from both years were combined.
Twospotted spider mites were primarily on the lower half of the plants from May, when the plants initiated growth, through early July. By early-to mid-August most of the spider mites were on the upper half of the plants. Since the apical growth of hops is very heavy at this time, conventional, contact spray pesticides cannot reach these mites. However, systemic pesticides may be effective for mite control.
References
Henderson, C.F. and H.V. McBurnie. 1943. Sampling techniques for determining populations of the citrus red mite and its predators. USDA Circ. 671.
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