Downy mildew symptoms on other cucurbits

• Organs attacked :

• Symptoms :
  • Small lesions at first moist, oily, yellowing and gradually becoming necrotic.
  • The spots are rather small (a few millimeters in diameter), circular to often angular because they are delimited by the veins, which gives the blade a marbled or mosaic appearance (figures 1 to 4).

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• Signs : presence of felting on the underside of the limb whose color varies from light gray to dark mauve. This felting is rather difficult to observe on these various Cucurbitaceae given the small size of the lesions.
• Possible confusion :

• Production areas affected :