Angular Leaf Spot Information

Angular Leaf Spot Information

By Josie Borlongan, Garden Guides Contributor
Angular Leaf Spot

About Angular Leaf Spot

Angular leaf spots is a bacterial disease that spread during wet conditions, such as splashing rain or people handling wet plants, whereby the bacteria enters the wounds or pores of leaves, stems and fruits.

Prevention and Control

Angular leaf spots can be prevented from spreading by pruning off infected stems and leaves. If the plants are still small, they can be uprooted or discarded; then start another planting at another location in the garden.

Stop sprinkler irrigation if there is a sign of angular leaf spot to prevent the spread of bacteria. Also harvest fruits from infected plants while still young.

Spray with copper during wet weather to slow the spread of the disease. When dry weather returns, you can stop spraying.

Affected Plants

Squash family crops


Angular leaf spot is characterized by the appearance of water-soaked spots on leaves and stems. The spots turn yellow and crisp and may cause the leaves to tear. As the disease progresses, the yellow spots turn brown and the leaf material falls out, leaving the leaves with characteristic angular holes and veining. On fruits, white spots are formed, whereby causing the tissue underneath to rot.

Other Methods of Control

* Garden Cleanup: Remove and discard any noticeably diseased plant debris and then compost.

* Before Planting: Improve soil drainage and plant only clean seeds. Choose resistant varieties available in the market.

* Crop Rotation: The bacteria can persist up to 2 years in the soil in crop debris; a 2-year rotation of plantings should break the disease cycle.

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