Silver Top of Bluegrass1

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Abstract:

Silver-topped panicles of bluegrass were as large as presumably normal panicles hut produced few if any viable seeds. Either maggots of the family Cloropidae or insect exit holes were found just above the last node in about 14% of examined silvertopped stems in 1958. Oscinella neocoxendix Sabrosky and O. coxendix (Fitch) were reared from stems with blasted seed heads. Seven other species of Chloropidae were collected by sweep net frol1l bluegrass fields. A life cycle of the flies was not completed in the laboratory but silver top was produced in the spring after flies had been released on caged bluegrass in the fall. Thc common type of silver top was not. produced by mechanical injury, virus transmission techniques or bluegrass plant bugs.

Document Type: Research Article

Publication date: December 1, 1962

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