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Sensitivity To 2,4-D In Sunflower As An Indicator Of Tolerance To The Sunflower Midge (Diptera: Cecidomyiidae), Marc D. Anderson, Gary J. Brewer
Sensitivity To 2,4-D In Sunflower As An Indicator Of Tolerance To The Sunflower Midge (Diptera: Cecidomyiidae), Marc D. Anderson, Gary J. Brewer
Department of Entomology: Faculty Publications
Nine sunflower hybrids were evaluated for their sensitivity to 2,4-dichlorophenoxyacetic acid (2,4-D) as measured by the production of ethylene. Sensitivity to 2,4-D was then compared with the degree of field tolerance to the sunflower midge, Contarinia schulzi Gagné, exhibited by each hybrid. For the hybrids evaluated, ethylene production increased with 2,4-D concentration and sensitivity to 2,4-D was inversely proportional to midge tolerance. The procedure may be useful in identifying midge tolerant germplasm.
Proposed System Of Nomenclature For Biotypes Of Hessian Fly (Diptera: Cecidomyiidae) In North America, F. L. Patterson, John E. Foster, H. W. Ohm, J. H. Hatchett, P. L. Taylor
Proposed System Of Nomenclature For Biotypes Of Hessian Fly (Diptera: Cecidomyiidae) In North America, F. L. Patterson, John E. Foster, H. W. Ohm, J. H. Hatchett, P. L. Taylor
Department of Entomology: Faculty Publications
Twenty genes in wheat, Triticum spp., for resistance to Hessian fly, Mayetiola destructor (Say),have been previously designated H1 to H20. The location on wheat chromosomes of some of the genes is known, but several have not yet 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 …