Problem Solving

What causes curling of leaves in water melons?
May 30, 2017 - 12:57
SMS Problem ID: #kibl
Answers: 2


beatrice luzobe's picture
June 1, 2017 - 10:36

Most of the curling and wrinkling of leaves is usually due to viral infection, however it is usually good to show the sample or photo of the diseased leaf

June 9, 2017 - 20:09

Curling of leaves in water melons is mainly casued by Downy mildew (Pseudoperonospora cubensis).

The symptoms of the disease  include  small, irregular, chlorotic spots on upper leaf surface becoming brown and necrotic; entire leaf may become blighted; infected leaves tend to curl upward from the margins. Gray to purple downy growth may be visible on underside of lesions

The disease survives only on living cucurbits; introduced into area by wind; spreads by air movement, rain-splashing and mechanically on equipment, etc.

The disease can be controlled  by application of  fungicides such as  Mancozeb (Dithane M-45) at the rate of   2g/litre. This can be used as a protective application at an internal of 5-7 days.

Culturally the disease can be controlled by   proper crop management through promotion of  air movement and reduction humidity levels inside the crop canopy. Avoid excess overhead irrigation. Consider irrigating during the late morning to facilitate rapid leaf drying. Maintain good weed control in the field. Control alternate weed hosts (wild cucumber, golden creeper and volunteer cucumbers) in neighbouring fence rows and field edges. Ensure field workers wash their hands before moving from one field to another and, if possible, wear freshly laundered clothing each day. If possible, work in diseased fields at the end of the day

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