MELOIDOGYNE CHITWOODI RACES IN FIELDS OF CENTRAL ANATOLIA, TURKEY
The Columbia root-knot nematode, Meloidogyne chitwoodi, is of economic importance to potato because it reduces tuber quality and quantity. Meloidogyne chitwoodi was first identified in Turkey from potato tubers collected in Nigde. Meloidogyne chitwoodi is currently reported to consist of two host races and two pathotypes, which cannot be distinguished morphologically or by utilizing molecular methods. Fifty-eight geographic isolates of M. chitwoodi were collected from Niğde (45), Nevşehir (12), and Aksaray (1) and used in this study. All isolates were evaluated for their ability to reproduce on carrot, alfalfa, and Solanum bulbocastanum SB22 for race and pathotype determination. Carrot was a good host for all populations (Reproductive factor (Rf): 2.01- 4.66), while alfalfa was classified as a poor host for 29 populations (Rf: 0.10-0.75) and as non-host for 29 populations (Rf: 0-0.09). None of the populations reproduced on S. bulbocastanum SB22. Based upon these results, only M. chitwoodi race 1 was found in Turkey with no evidence for the existence of host race 2 and its associated pathotypes.