Race Composition of Meloidogyne incognita and M. arenaria Populations in Vegetable Fields in Uttar Pradesh.

A total of 1,256 populations of Meloidogyne incognita and 442 populations of M. arenaria were collected from vegetables in eight districts of Uttar Pradesh, India. Host differentials were used to identify the host race of each population. All four host races of M. incognita were present in six of the eight districts. In the other two districts, only host races 1, 2, and 4 were found. Although frequencies of occurrence of the races differed among districts, races 1 and 2 comprised 62% of all M. incognita populations evaluated. Only host race 2 of M. arenaria was found in this survey, and this race was found in all eight districts. This is the first report of M. arenaria host race 2 from India.