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Retention of resistance by mutants of floratam st augustine grass stenotaphrum secundatum to the southern chinch bug blissus insularis and st augustine decline


Retention of resistance by mutants of floratam st augustine grass stenotaphrum secundatum to the southern chinch bug blissus insularis and st augustine decline



Crop Science 21(3): 464-466



ISSN/ISBN: 0011-183X

St. Augustinegrass, S. secundatum (Walt.) Kuntze, a widely used turfgrass in the southern coastal states, has 2 major limiting pests, southern chinch bug, Blissus insularis Barbar and St. Augustine decline strain of Panicum mosaic virus (PMV-SAD). .gamma.-Ray-derived mutants of Floratam, a very coarse cultivar which is resistant to both pests, were evaluated for stability of resistance and turf characteristics. All mutants retained resistance of PMV-SAD and all except # 14 caused higher antibiosis to the confined bugs than the susceptible Florida Common St. Augustinegrass (22%). Mutant # 6 produced 76% mortality of the confined southern chinch bugs at 7 days which was significantly greater than the mortality produced by four of the other mutants. None of the mutants was significantly more resistant than Floratam (65% mortality). Egg deposition was significantly less on Floratam and all mutants (from 4 to 13 eggs/stolon) than on the Florida Common (average of 23 eggs/stolon). One of the mutants had a faster rate of establishment and all mutants had shorter internodes than Floratam, all were immune to PMV-SAD, and only on had lost its southern chinch bug resistance.

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Accession: 006334270

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