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- Author or Editor: Minoru Shimotsuma x
(2-Chloroethyl)phosphonic acid (ethephon) increased the proportions of perfect and completely pistillate flowers, especially on lower nodes of the main vine where normally only staminate flowers are formed, on several muskmelon (Cucumis melo L.) cultivars in growth chambers and in the field. Lower concn were needed for female conversion under short days than long days. Early-maturing cultivars appeared more responsive to ethephon than late cultivars. No daylength-ethephon combination was effective in changing sex expression of watermelon (Citrullus vulgaris Schrad).
Temperature, cultivar, locus of inoculation, and prior-inoculation (inoculation 24 hr earlier with 3 nonpathogenic fungi) affected the expression of fusarium wilt caused by Fusarium oxysporium f. niveum (E.F.Sm.) Snyder & Hansen, in watermelons. Prior inoculation with Helminthosporium carbonum Ulktrup was found to be more effective in cross protection than were Fusarium oxysporium f. lycopersici (Sacc.) Snyder & Hansen, or Verticillium alboatrum Reinke & Berth. Temperatures of 27°C resulted in more fusarium infection than at 20° and obscured the expression both of genetic resistance and resistance induced by the prior-inoculations. Induced resistance increased plant survival and plant growth for 3 cultivars in field trials, but possibly produced deleterious effects in a resistant cultivar.