Interaction of Ditylenchus dipsaci and Meloidogyne hapla on Resistant and Susceptible Plant Species
Griffin, G.D.
Journal of Nematology 19(4): 441-446
1987
ISSN/ISBN: 0022-300X PMID: 19290168 Document Number: 304784
Numbers of D. dipsaci or M. hapla invading 'Ranger' alfalfa , 'Tender' crop bean (Phaseolus vulgaris), 'Stone Improved' tomato, 'AH-14' sugarbeet, 'Yellow' sweet clover (Melilotus indica), and 'Wasatch' wheat from single inoculations were not significantly different from numbers by invasion of combined inoculations. D. dipsaci was recovered only from shoot and M. hapla only from root tissue. Combined inoculations did not affect reproduction of either D. dipsaci or M. hapla. D. dipsaci suppressed shoot growth of all species at 15-30 degrees C, and M. hapla suppressed shoot growth of tomato, sugarbeet and sweet clover at 20, 25, and 30 degrees C. There was a positive correlation between shoot and root growth suppression by D. dipsaci on all cultivars except wheat at 20 degrees C and tomato at 30 degrees C. M. hapla suppressed root growth of sugarbeet at 20-30 degrees C and wheat at 30 degrees C. Growth suppression was synergistic in combined inoculations of sweet clover shoot growth at 15 degrees C and root growth at 20-30 degrees C, wheat root growth at 15 and 20 degrees C, and tomato root growth at 15-30 degrees C. D. dipsaci invasions caused mortality of lucerne and sweet clover at 15-30 degrees C and sugarbeet at 20-30 degrees C. Mortality rates of lucerne and sweet clover increased synergistically from combined inoculations.