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Histological Examination of Larval Clover Root Curculio (Coleoptera: Curculionidae) Damage to Ladino White Clover

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Characteristic Sitona hispidulus (F.) larval root wounds on six genotypes of Ladino clover were histologically examined to determine average tissue penetration of curculio wounds. No differences in tissue penetration were found among the six genotypes. Wounds in zone 1 (root region 0 to 2.5 cm below soil surface) were deeper than those in zone 2 (root region 2.5 to 5 cm below soil surface), but this was not reflected in the wound scores. 'Tillman' was the only genotype to incur wounds which penetrated into the xylem. Most root wounds found on 'Tillman' in zone 1 were significantly deeper than wounds found on the other five genotypes (zones 1 and 2). A negative correlation (r = −0.79) was found between cellulose fiber density in the cortex and phloem regions and depth of root tissue penetration for five of the six genotypes. The sixth genotype possessed low fiber density and a shallow wound score.

Document Type: Research Article

Publication date: August 1, 1983

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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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