Abstract
Five Digitaria accessions, classified as resistant or susceptible to Sipha flava (Forbes) in screening trials, were studied in the laboratory to determme mechanisms of resistance, effectiveness of resistance against two geographically isolated aphid populations, and the value of resistance in reducing yield and quality losses in Digitaria species attacked by S. flava . Four accessions—P.I. 299610 and 299612, D. diversinervis (Nees) Stapf; 364357, D. frieseii Pilger; and 364523, D. longiflora (Retz.) Pers.—exhibited a high level of resistance to aphid adults and nymphs. Antibiosis appeared to be the main mechanism of resistance, based on studies with P.I. 364357. The accessions P.I. 299610, 364357, and 364523 were resistant to aphid populations from Louisiana and the Bahamas, whereas P.I. 111110, D. decumbens Stent, (pangolagrass) was highly susceptible to both populations. The level of resistance in P.I. 364357 was sufficient to prevent significant changes in dry-matter yield, prevent dry matter, and percent protein in plants receiving moderate to heavy infestations of the yellow sugarcane aphid. Yield and percent protein were significantly reduced, and percent dry matter was significantly increase in infested pangolagrass.
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