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Techniques in the Evaluation and Development of Host-Plant Resistance¹

ABSTRACT

A thorough knowledge of both insect and plant and their inter-relationship is required to evaluate cultivars for insect resistance. Cultivars from all possible sources are obtained and subjected to an adequate and uniform insect infestation. Resistance may be measured by (i) visual observation, (ii) the effect of insects on plants, (iii) the effect of plants on insects, or (iv) indirect methods. Resistance may be transferred to usable cultivars by grafting, selection, or hybridization. Germ plasm obtained from a wide genetic base will help to insure a more permanent resistance.

¹ Contribution of the Entomology Res. Div., Agr. Res. Serv., USDA, Beltsville, Maryland. Paper presented Aug. 19, 1971, in New York City at the annual meeting of the ASA as part of the symposium"Breeding for Host-Plant Resistance to Insect Pests."

² Agricultural Administrator, Agr. Res. Serv., USDA. Beltsville, Md. 20705.

Received for publication December 13, 1971.