Abstract
Results from field experiments conducted during 1961 and 1962 revealed that infestations of the carmine spider mite, Tetranychus cinnabarinus (Boisduval), artificially established at different times of the growing season, reduced yield of seed cotton 14 to 44%. In general, yield depression was directly related to population density and duration of infestation. Spider mite injury also reduced boll size and appeared to adversely affect several characters of the seed and lint. Infestation counts and climatic data from each experiment revealed that mite populations and subsequent damage were greatest during periods of hot, dry weather. Hard and heavy rainfall reduced population density. Heavy mite infestations caused typical foliage discoloration and desiccation, but rarely caused extensive defoliation.
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