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Further Results From a Field Experiment On the Effect of Growing Resistant Potatoes On a Potato Root Eelworm (Heterodera Rostochiensis) Population

1962; Brill; Volume: 7; Issue: 1 Linguagem: Inglês

10.1163/187529262x00747

1875-2926

H. W. Howard, C. S. Cole,

Insect Resistance and Genetics

Results are given for the 5th and 6th years of a field experiment on the effect of growing eelworm-resistant potatoes bred from resistant clones of S. tuberosum spp. andigena. Marked increases in the frequencies of biotype B (resistance-breaking) eelworms were found, and, following these increases, the total eelworm populations in the plots also increased. All the resistant andigena clones tested were resistant to biotype A and susceptible to biotype B. Resistance to biotype B and susceptibility to biotype A was confirmed for S. multidissectum and S. x juzepczukii.