(Oidium-type, Erysiphe heraclei): white mycelium and spores, which may be dense, on all above-ground plant parts including leaves and petioles, as well as flower stalks and bracts. As spots enlarge on leaves, the foliage may become, early senescence may occur.
Infection is favored by high humidity and moderate temperatures, but damage can be most severe in dry, warm climates. Powdery mildew is more severe under shady conditions, since sunlight damages the spores and mycelium. Crops become more susceptible as they age.
Other controls include crop rotation, use of less susceptible cultivars, good plant vigor while avoiding excess fertilization. Avoid shady growing conditions or water stress; in Israel, mulches applied to crops reduced drought stress and powdery mildew severity.
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Product list for Powdery Mildew: |
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Pesticide
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Product per acre |
Application Frequency
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Remarks |
Cabrio |
8-12 oz |
7-14 days |
Maximum of 3 applications and 48 oz/A; 0 days PHI |
Pristine |
8-10.5 oz |
7-14 days |
Maximum of 6 applications and 63 oz/A; 0 days PHI |
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: Carrot, Powdery mildew, Diseases
Date: 04/01/2007