Effect of Temperature on Reproduction and Motility of Pratylenchus vulnus.

Reproduct ion of Pratylenchus vulnus Allen and Jensen on rose was repor ted faster at 32.2 C than at 23.9 and 15.6 C (6). Reproduct ion on alfalfa tissue was faster at 25 C than at 20 and 30 C (3), while on 'Lovell ' peach and bush bean, reproduct ion was faster at 28.3 C than at 24.4, 20.6, 16.7, and 12.8 C (1). Populat ions of P. vulnus and other species of root-lesion nematodes are often raised on carrot disks (4,5), but the o p t i m u m tempera ture for reproduct ion on carrot disks has not been determined. Therefore , the following tests were performed to determine the o p t i m u m temperature for reproduct ion on carrot disks and to examine the effect of t empera ture on the nematodes ' motili ty. Specimens of P. vulnus were collected,