|Mitchell, F. - TEXAS AGRIC. EXPT. STN.|
|Fletcher, J. - OKLAHOMA STATE UNIVERSITY|
Submitted to: American Phytopathological Society
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2000
Publication Date: April 1, 2000
Citation: DAVIS, A.R., PAIR, S.D., BRUTON, B.D., MITCHELL, F., FLETCHER, J. YELLOW VINE INCIDENCE IN WATERMELON AS RELATED TO GENOTYPE AND PLOIDY. AMERICAN PHYTOPATHOLOGICAL SOCIETY. 2000. V. 90. P. S18. Technical Abstract: A phloem-limited bacterium has been associated with yellow vine of watermelon and evidence suggests that the bacterium may be vectored by leafhoppers. At present, producers lack satisfactory control strategies for the disease in Oklahoma and Texas. In 1997-98, 21 watermelon cultivars representing open-pollinated, hybrid, and polyploid genotypes were field screened (Lane Research Station) for resistance to yellow vine. Percentage of yellow vine was significantly influenced by both cultivar and by ploidy level. Incidence of yellow vine in the different genotypes were as follows: 18.5% in open-pollinated (2n), 13.4% in hybrids (2n), 6.8% in triploid (3n) seedless, and 3.4% in a tetraploid (4n) line. Increased leaf pubescence and hybrid vigor are being explored as resistance mechanisms to yellow vine disease.