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.

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