Soilless Cultivation of Cucumber Downy Mildew

Soilless Cultivation of Cucumber Downy Mildew

Cucumber downy mildew, commonly referred to as "racehorse," is a widespread disease affecting cucumbers grown in soilless systems. It is caused by infection from the pathogen *Peronospora farinosa* f. sp. *cucumerina*, a type of oomycete. The disease typically begins with the appearance of water-soaked lesions on the leaves, which later develop into distinct, yellowish, polygonal spots. These lesions thrive in high humidity conditions, and on the underside of the affected leaves, black mold structures—such as spore cysts and sporangia—become visible. As the infection progresses, the lesions expand, leading to complete yellowing and wilting of the leaves, hence the name "racehorse" due to its rapid spread. To manage this disease, several chemical control methods are available. For instance, 25% Triflumizole wettable powder can be applied at a dilution of 300 times, while 75% Chlorothalonil wettable powder is effective when diluted 600 times. Additionally, 40% Ethaboxam emulsifiable concentrate can be used at a 300-fold dilution. Another option is 45% Chlorothalonil formulation, which can be applied as a fumigant at a rate of 3750 grams per hectare. It's important to follow proper application guidelines and rotate fungicides to prevent resistance development. Regular monitoring and maintaining optimal environmental conditions, such as reducing humidity levels, can also help in preventing the outbreak of cucumber downy mildew.

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