Bacterial stripe is caused by the bacterium Pseudomonas syringae pv. striafaciens. Bacterial stripe is uncommon in the High Plains region and is generally associated with sprinkler irrigation in cool (60-77ºF), humid, and wet weather. The pathogen can be spread by splashing rain and irrigation water, contaminated seed, and in crop debris. The pathogen survives between crops in debris, pathogenically on alternate hosts, and epiphytically on alternate hosts and weed, and in contaminated seed. The pathogen is readily moved in irrigation water.
Bacterial stripe symptoms appear as small (less than 0.04 inches) water-soaked lesions that expand and eventually coalesce. These lesions may coalesce into stripes or blotches, which may extend the length of the leaf blade. These stripes often have narrow, yellowish margins. Heavy infections may kill leaves. Bacterial stripe rarely causes economic damage in the High Plains.
No biological control strategies have been developed for bacterial leaf blight.
Plant high quality seed free of the pathogen. Avoid frequent or overhead irrigation, especially during cool, wet weather. Incorporate crop debris and practice crop rotation to non-hosts for at least two years. Avoid reuse of irrigation tail water.
Seed treatment with copper bactericides may provide some disease control.
Product List for Bacterial Stripe:
Pesticide
|
Mode of action
|
Product per 100
pounds
|
Remarks
|
|
|
Copper and Copper/EBDC: not all formulations listed |
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|
Champ Flowable |
|
2 fl oz |
Seed treatment |
|
|
Kocide 4.5LF |
|
2 fl oz |
Seed treatment |
|
|
ManKocide |
|
4 oz |
Seed treatment; may provide superior suppression of copper tolerant bacteria |
|
|
|
The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality. |
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Categories: Small Grains, Disease, Bacterial Stripe, Barley, Oat
Date: 3/8/2005
