Abstract
Of 14 varieties and lines of cucumber and seven of cantaloup tested for resistance againstPseudoperonospora cubensis, only the cucumbers Poinsett and Chipper were found to be highly resistant. Growth chamber studies showed that resistance of young as well as of old (> 8-leaf-stage) plants was stable under considerably high (300 sporangia/cm2) inoculum loads. Resistance was conferred by both restriction of fungal growth and prevention of sporangial formation.
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Barnes, W.C. and Epps, W.M. (1950) Some factors related to the expression of resistance of cucumbers to downy mildew.Proc. Am. Soc. hort. Sci. 56: 377–380.
Barnes, W.C. and Epps, W.M. (1954) An unreported type of resistance to cucumber downy mildew.Pl. Dis. Reptr 38: 620.
Cohen, Y., Perl, M. and Rotem, J. (1971) The effect of darkness and moisture on sporulation ofPseudoperonospora cubensis in cucumbers.Phytopathology 61: 594–595.
Cohen, Y. and Rotem, J. (1969) The effect of lesion development, air temperature and duration of moist periods on sporulation ofPseudoperonospora cubensis in cucumbers.Israel J. Bot. 18: 135–140.
Cohen, Y. and Rotem, J. (1971) Rate of lesion development in relation to sporulating potential ofPseudoperonospora cubensis in cucumber.Phytopathology 61: 265–268.
Cohen, Y. and Rotem, J. (1971) Dispersal and viability ofPseudoperonospora cubensis.Trans. Br. mycol. Soc. 57: 67–74.
Palti, J. (1974) The significance of pronounced divergences in the distribution ofPseudoperonospora cubensis on its crop hosts.Phytoparasitica 2: 109–116.
Schein, R.D. (1964) Design, performance, and use of a quantitative inoculator.Phytopathology 54: 509–513.
Sitterly, W.R. (1972) Breeding for disease resistance in cucurbits.A. Rev. Phytopathol. 10: 471–490.
Van Vliet, G.J.A. and Meysing, W.D. (1974) Inheritance of resistance toPseudoperonospora cubensis Rost. in cucumber (Cucumis sativus L.).Euphytica 23: 251–255.
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Cohen, Y. Quantitation of resistance of cucumbers and cantaloups toPseudoperonospora Cubensis . Phytoparasitica 4, 25–31 (1976). https://doi.org/10.1007/BF02981076
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DOI: https://doi.org/10.1007/BF02981076