RESULTS OF THE INTERNATIONAL CORN DOWNY MILDEW NURSERY

Abstract

The International corn (Zea mays L.) downy mildew nursery was primarily conducted to study intra- and inter-specific virulence patterns within the genus Sclerospora. Secondary objectives were to promote cooperation among participating programs, foster the exchange of downy mildew resistant (DMR) corn germplasm and test the reaction of the DMR varietial entries in the Inter-Asian Corn Program (IACP) cooperative yield trials. The nursery was grown annually from 1969 through 1975. The Asian countries were the main participants, but outside of IACP countries, the nursery was grown in the United States of America, Mexico, Argentina, Venezuela, Israel, Papua New Guinea and Zaire when requests were received and the years plant quarantine permitted the entrance of seeds.