The leafhopper, Graminella nigrifrons , is presumed to be the major vector. Wheat Streak Mosaic Virus. Streaks elongate and develop parallel to the veins. Older leaves may become chlorotic near the tips with green margins bordering the veins. Ears may be developed poorly and have poor seed set.
Infected mites migrate from wheat fields adjacent to corn.
Two leafhopper species, Dalbulus maidis and D. eliminatus , are the principal vectors. These leafhoppers are not native to Missouri, and the occurrence of the disease in Missouri is unlikely. Controls Development of resistant or tolerant corn hybrids offers the best long-lasting method of control. The University of Missouri has had an ongoing program of evaluation of inbred lines and hybrids under conditions favorable for intense natural infection. Research plots have been placed in Jefferson County near House Springs and at the Delta Experiment Station near Portageville, where Johnsongrass has been prevalent.