Bacterial Leaf Spot of Lettuce

Xanthomonas campestris pv. vitians

Names:

Dry Leaf Spot of Lettuce that first shows as translucent spots about 5-10 mm diameter on leaves. The spots may merge causing large dead patches. In severe infections the whole plant may rot.

Description:

A bacterial disease

Species Affected:

Lettuce.

Biology:

Favoured by cool wet winters.
Bacteria do not live long in the soil on crop debris.
Spread by raindrop splash.

Life Cycle:

Origin and History:

Distribution:

Significance:

Management and Control:

Use healthy seed.
Rotate with resistant crops.
Control alternate hosts in the crop and adjacent areas.
Watering in the morning to reduce the time that leaves are wet.
Avoid overhead irrigation.
Ensure good drainage.
Avoid physical damage to Lettuce.

Related and Similar Species:

References:

1291

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.