Evaluation of multiple disease resistance of the F2 generation of corn hybrids
1991
Raymundo, A.D. | Calilung, B.J. Jr. | Aquino, A.T. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Plant Pathology)
F2 populations of commercial corn hybrids were evaluated for reaction to Philippine downy mildew, bacterial stalk rot, Rhizoctonia banded leaf and sheath blight, and Helminthosporium leaf spot. The F2 hybrids generally, were highly susceptible to downy mildew under high inoculum pressure. Only four entries, F3228F2, SMC-317F2, P3208F2, and YBCy-65F2, showed infection below 30%. Against bacterial stalk rot, only SMC 308F2 showed a moderately resistant reaction. All other entries were either susceptible or highly susceptible. No significant differences in Rhizoctonia blight and Helminthosporium leaf spot infections were observed among entries. As many farmers currently are using F2 seeds from F1 parents whose parentage usually is of foreign origin, there appears to be a high risk of sustaining considerable losses in yield due to downy mildew and bacterial stalk rot.
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