title: Host Tests to Differentiate Meloidogyne chitwoodi Races 1 and 2 and M. hapla.
abstract: The reproductive factor (R = final egg density at 55 days / 5,000, initial egg density) of Meloidogyne chitwoodi race 2 (alfalfa race) on 46 crop cultivars ranged from 0 to 130. The reproductive efficiency of M. chitwoodi race 1 (non-alfalfa race) and M. chitwoodi race 2 was compared on selected crop cultivars. The basic difference between the two races lay in their differential reproduction on Thor alfalfa and Red Cored Chantenay carrot. M. chitwoodi race 2 reproduced on alfalfa but not on carrot. Conversely, alfalfa was a poor host and carrots were suitable for M. chitwoodi race 1. Based on host responses to M. chitwoodi races and M. hapla, a new differential host test was proposed to distinguish the common root-knot nematode species of the Pacific Northwest.
authors.forename: H
authors.initials: H
authors.lastname: Mojtahedi
authors.forename: G S
authors.initials: GS
authors.lastname: Santo
authors.forename: J H
authors.initials: JH
authors.lastname: Wilson