Morphological Responses of Strawberry Leaves to Infestations of Twospotted Spider Mite

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Injury to strawberry leaves caused by various infestation levels of Tetranychus urticae Koch was studied. Reduction in leaflet chlorophyll content by twospotted spider mite feeding was more evident on the lower leaflet surfaces where mites fed. Chlorophyll content of upper leaflet surfaces was not significantly reduced by mite feeding from the lower surface. On the lower surface, infestations of 24.4 and 46.1 mite-days/cm2 significantly reduced chlorophyll content compared to the mite-free control. Percent leaflet area scarred by mite feeding was correlated with increasing mite infestation levels. Histological observations indicated that mite feeding injury at 4.8 mite-days/cm2 was restricted to localized areas of the spongy mesophyll and lower palisade mesophyll layers. Injury was more extensive at the higher densities and resulted in destruction of the spongy mesophyll and substantial injury to the lower palisade layer. Significant differences in stomatal opening occurred between mite-infested and mite-free leaflets with the majority (61%) of the stomata closed in infested tissues. The mechanisms of mite injury and plant responses are discussed.

Document Type: Research Article

Publication date: October 1, 1979

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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