Resistance of ‘Dayecaoying' to major root-knot nematodes

In order to find out an excellent root-stock of sweet cherry resisting to major root-knot nematodes, ‘Dayecaoying'pot-grown seedlings were inoculated with four major root-knot nematodes including Meloidogyne hapla, M.arenaria,M.incognita and M.javanica.The result showed that in 35 days after inoculation,the number of ‘Dayecaoying'seedlings without root-knots which were inoculated with M.hapla(60),M.arenaria(59),M.incognita(58)and M.javanica(60)were 1,7,2and 8on level 0and 59,52,59and 52on level 1.Their disease indexes were 19.7,17.6,19.3and 17.3respectively.‘Dayecaoying'was highly resistant to four kinds of root-knot nematodes according to the standard of resistance evaluation.Immune and highly resistant types were found in the seedling colony of‘Dayecaoying'.The separated ratios of the seedlings immune to M.hapla,M.arenaria,M.incognita and M. javanica were 1.7%,11.9%,3.4% and 13.3%respectively.Therefore,‘Dayecaoying'was regarded as an excellent root-stock of sweet cherry and a germplasm resource to root-knot nematodes.