Co-Authors:
van Silfhout, C.H., Research Institute for Plant Protection (IPO), P.O. Box 9060, Wageningen, 6700 GW, Netherlands
Gerechter-Amitai, Z.K., The Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, Israel
Abstract:
In a comparative study of 272 entries of wild emmer (Triticum dicoccoides), resistance to powdery mildew (Erysiphe graminis f. sp. tritici) was determined both in the seedling and the adult plant stage. The performance of the entries was evaluated with two methods, scoring of infection types and noting the uppermost leaf which had become affected. With the first method, 133 entries were resistant both in the seedling stage and the adult plant stage, while with the second method 134 entries were resistant in the seedling stage and free of infection or affected only on the lower leaves in the adult plant stage. Moreover, 26 entries which were susceptible in the seedling stage, became moderately resistant or resistant in the adult plant stage. In general, there was good agreement between seedling and adult plant reactions. Screening for resistance to powdery mildew in the seedling stage was shown to be a reliable method to secure selections for wheat breeding programmes. By screening in the adult plant stage and comparing with the seedling reaction, four different types of resistance were found, namely true seedling resistance, overall resistance, adult plant resistance and partial resistance. © 1988 Koninklijke Nederlandse Planteziektenkundige Vereniging.
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