Anthracnose of spinach is caused by the fungus Colletotrichum spinaciae. The disease cycle is initiated by spores disseminated by wind and splashing irrigation and rainwater. The disease is most destructive at temperatures between 79 to 86º F, with abundant moisture. The fungus overwinters in seed and infested crop debris.
Anthracnose symptoms initially appear as small, dark olive-colored water-soaked spots. As the spots enlarge, they become tan in color. Under disease favorable conditions, lesions become larger and more numerous, eventually coalescing and killing entire leaves and petioles. If weather conditions become less favorable for disease, severely infected leaves will drop from the plant and new foliage will appear relatively free from infection.
The disease reduces both spinach yield and quality.
No biological control practices have been developed for anthracnose.
Plant high quality spinach seed free from the anthracnose pathogen. Practice a three-year or longer rotation to nonhosts, such as small grains or corn. Avoid overhead irrigation, especially during humid, cloudy weather. Deeply bury crop residues soon after harvest to reduce pathogen survival and overwintering. Eliminate volunteer spinach.
Chemical controls are most effective when integrated with sound cultural control practices.
Product List for Anthracnose:
Pesticide |
Product per Acre |
Application Frequency (days) |
Remarks |
|
Copper Fungicides—not all formulations available are listed |
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|
Champ DP |
1.33-2.66 lb |
7-10 days |
Can cause leaf flecking |
|
Copper-Count-N |
3 pt |
7-10 days |
Can cause leaf flecking |
|
Cuprofix Disperss |
2.5-4 lb |
7-10 days |
Can cause leaf flecking |
|
Kocide 2000 |
1.5-2.25 lb |
7-10 days |
Can cause leaf flecking |
|
Kocide 3000 |
0.75-1.25 lb |
7-10 days |
Can cause leaf flecking |
|
Nordox |
2-3 lb |
7-10 days |
Can cause leaf flecking |
|
Nu-Cop 3L |
1.33-2.66 pt |
7-10 days |
Can cause leaf flecking |
|
Tri-Basic Copper |
4 pt |
7-10 days |
1 day PHI |
|
Neem |
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Trilogy |
2 pt |
7-14 days |
Maximum of 2 gallons per season; 0 day PHI |
|
Potassium Bicarbonate |
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|
Armicarb 100 |
2.5-5 lb |
5-14 days |
Apply in at least 20 gallons per acre; 0 day PHI |
|
Strobilurin |
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Amistar |
2-5 oz |
5-14 days |
Maximum of 4 applications; rotate with a fungicide with a different mode of action; 0 day PHI |
|
Quadris |
6.2-15.4 fl oz |
5-14 days |
Maximum of 4 applications; rotate with a fungicide with a different mode of action; 0 day PHI |
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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: Spinach, Diseases, Anthracnose
Date: 04/01/2007