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Combined Resistance in St. Augustinegrass to the Southern Chinch Bug and the St. Augustine Decline Strain of Panicum Mosaic Virus. B. D. Bruton, Department of Plant Sciences, Texas A&M University, College Station 77843. R. W. Toler, Department of Plant Sciences, Texas A&M University, College Station 77843, and J. A. Reinert, Agricultural Research Center, University of Florida IFAS, Ft. Lauderdale 33314. Plant Dis. 67:171-172. Accepted for publication 8 July 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-171.

Chinch bug resistant St. Augustinegrass accessions were evaluated for resistance to the St. Augustine decline strain of Panicum mosaic virus (PMV-SAD). Accessions FA-38, FA-82, FA-217, and FA-236 were symptomless carriers of PMV-SAD, as determined by bioassay on German Strain R millet; FA-46, FA-64, FA-108, FA-118, FA-121, and FA-243 exhibited combined resistance to chinch bugs and PMV-SAD. Combined resistance equal to that of the cultivar Floratam was found in FA-108 and FA-118. There was no apparent correlation between resistance to PMV-SAD or chinch bug and pigment of stolons or stigmas.

Keyword(s): Blissus insularis, Stenotaphrum secundatum.