. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 32 THE KED SPIDER ON HOPS IN CALIFORNIA. successfully control the mites. Too much faith should not be placed in this operation, however, as spraying may have to be resorted to as a final measure. The cost of stripping is about $2 per acre and is more than offset by the results obtained. Irrigation.—Vines which have not a large supply of moisture dry and change color more rapidly than those growing in moister soil, so that the work of the red spider is most noticeable on light soil in. Fig. -Hopvine tied high and
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 32 THE KED SPIDER ON HOPS IN CALIFORNIA. successfully control the mites. Too much faith should not be placed in this operation, however, as spraying may have to be resorted to as a final measure. The cost of stripping is about $2 per acre and is more than offset by the results obtained. Irrigation.—Vines which have not a large supply of moisture dry and change color more rapidly than those growing in moister soil, so that the work of the red spider is most noticeable on light soil in. Fig. -Hopvine tied high and stripped; lower leaves matted and difficult to spray. (Original.) the drier parts of the hopyards. Several growers, believing that irrigation of the infested vines would counteract the effect of the mites, pumped water onto their yards and gave the soil a thorough wetting. The vines responded and put out a few fresh leaves, but the mites infested these in the same manner as before and reduced the quality of the hops in the same proportion as on unirrigated and equally infested parts of the adjoining hopyards. Irrigation will not control the mites, but when the soil lacks sufficient moisture it will. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Entomology. Washington : G. P. O.
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