Leaf blights on watermelon crops can be a huge pain in the butt, but this fungal disease can be treated and prevented! Alternaria leaf blight is a common fungal disease which usually affects plants in the cucurbit species such as gourds, melons, squash, and watermelons. In this post, we’ll show you how to treat left blight on watermelon crops so that your watermelons can grow big and healthy WITHOUT the fungus!

How to Treat Leaf Blight on Watermelon Crops – a DIY Solution

watermelon alternaria

Recognizing Leaf Blight:

Alternaria leaf blight is caused by a fungal agent whose spores are carried around by wind and water. This usually tends to happen when the weather is favorable for these spores, usually late spring to midsummer, when weather turns from cool to warm and humid.

Leaf blight can also overwinter in garden debris, and, as temperatures start to rise in spring and summer, these spores are carried from plant to plant by way or rain and/or wind.

You can spot leaf blight on your watermelon crops pretty easily! Small grey to brown spots will appear on older leaves of watermelon plants. Often times, these spots are accompanied by a light green-to-yellow water-soaked ring around the spot, sort of like a halo.

As this fungus grows, the center and “halo” will grow darker and more concentric rings will form, giving the appearance of a bulls-eye or a target. The affected leaves will then curl up like a cup before dying off.

Preventing Leaf Blight:

watermelon leaf blight

Once a crop has become deeply infected, it’s very important to remove all crops and debris from the garden to prevent further damaged. Garden tools should also be sanitized.

New soil should be worked in, and watermelon crops should be rotated.

If you only see leaf blight on one or just a few plants, you may apple a fungicide bi-weekly to control the spread and stop it in its tracks.

Fungicides that contain azoxystrobin, boscalid, chlorothalonil, copper hydroxide or potassium bicarbonate have shown to be very effective in controlling watermelon alternaria leaf spot when used regularly and in combination with proper sanitary practices.

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treat leaf blight on watermelon crops