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Twenty genes in wheat, Triticum spp., for resistance to Hessian fly, Mayetiola destructor (Say),have been previously designated HI to H20. The location on wheat chromosomes of some of the genes is known, but several have notyet been assigned to specific chromosomes. Four wheat differential cultivars have been used to identify 16 possible biotypes of Hessian fly; biotypes were designated GP and A-O. If an additional differential host genotype were added, it is apparent that there are not enough letters in the alphabet to designate all of the biotypes. Therefore, a new system of biotype designation is proposed. Three differential cultivars or lines are assigned to a set. Sets are designated A, B, C, and so on. There are eight combinations of resistant and susceptible reactions within a set. These are coded 1 to 8 for each set. Three sets are proposed to begin biotype designation. Abiotype avirulent to all differentials in three sets is coded 111. If set C were not used, a zero (untested) replaces the digit. In the above case, the biotype is designated 110.The biotype designation system provides flexibility for the addition of new sets as new genes are identified and for the deletion of sets no longer deemed useful.
Document Type: Research Article
Publication date: April 1, 1992
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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.