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Antibiosis to the Southern Chinch Bug by St. Augustinegrass Accessions

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Abstract:

Twenty-six accessions of St. Augustinegrass, Stenotaphrum secundalum (Walt.) Kuntze, were evaluated under laboratory conditions for resistance to Blissus insularis Barber. ‘Floratam’, FA-46, 64, 73, 80, 87, 121, 131, 145, 217, and 243 when compared to common St. Augustinegrass exhibited significant antibiosis (P<0.05) to the caged adult southern chinch bug populations within 4–7 days. Floratam produced significantly more antibiosis (P<0.05) than any other selection when evaluated at 4 and 5 days but by the 7-day evaluation FA-46, 73, 87, 121, and 131 were not significantly different from Floratam.

Significant (P<0.05) antibiosis to the 5th instars also was shown for 8 of the accessions including Floratam. A similar difference was also shown in the percentage of confined nymphs which survived but failed to molt to adults within 7 days for Floratam and FA-46, 131, and 173.

Unlike Floratam which is very coarse-textured, the resistant selections FA-80, 121, 131, 145,and 243 are fine-textured. Like Floratam all 5 of these are relatively fast-growing, although FA-243 is the most vigorous accession.

Document Type: Research Article

Publication date: February 1, 1978

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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