Quantitation of resistance of cucumbers and cantaloups toPseudoperonospora Cubensis
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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.
Key WordsCucumber downy mildew
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