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Differential Response of Kenaf to Gray Mold¹

The response of 11 cultivated and five wild types of kenaf (Hibiscus cannabinus L.) to gray mold, caused by Botrytis cinerea Pers. ex Fr., was studied at the 1-weekold plant stage in the greenhouse and at the mature plant stage in the field. Highly significant differential responses were noted in the greenhouse and field. Greenhouse and field responses, however, were not totally consistent. Genetic variation may be sufficient so that resistant strains can be developed. Analyses indicate that the greenhouse technique may be effective in isolating strains that would demonstrate some level of field susceptibility but that the development of field resistance can only be accomplished by greenhouse or field screening of mature plants.

Key Words: Botrytis cinerea • Hibiscus cannabinus L. • Disease resistance

² Research agronomist, and research plant pathologist, respectively, Germplasm Resources Laboratory, AR, SEA, USDA, Beltsville, MD 20705.

Received for publication April 11, 1980.