Mildiu
Downy Mildew
Pseudoperonospora Cubensis
Pathogen:
Oomycete
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Pseudoperonospora cubensis is an oomycete, a type of fungal-like organism, that causes the disease known as downy mildew in cucurbits. This pathogen is especially harmful to crops such as cucumber, pumpkin, zucchini and melon. It is characterized by its rapid dispersion in conditions of high humidity and moderate temperatures.
SYMPTOMS
The disease caused by Pseudoperonospora cubensis in cucurbits manifests mainly as oily yellow Taches on the leaves, which eventually become covered with a dark gray or white mold. As the disease progresses, these Taches can expand and fuse, causing significant deterioration in the plant's health and reducing its ability to photosynthesize.
TEMPERATURE AND HUMIDITY
15 - 25ºC
90%
HOW IS IT SPREAD?
Direct contact with infected plants, spread of spores through contaminated irrigation water, and spread by wind during periods of high humidity.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 60g/L [ME] P/S
• AMETOCTRADIN 12% + METIRAM 44% [WG] P/P
• AMETOCTRADIN 20% [SC] P/V
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• CIAZOFAMIDE 16% [SC] P/V
• CYMOXANIL 45% [WG] P/P
• CYMOXANILE 60% [WG] P/P
• FOSETIL 31% + Propamocarb 53% [SL] P/V
• FOSETIL-AL 80% [WG] P/P
• FOSETIL-AL 80% [WP] P/P
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WG] P/P
• METIRAM 70% [WG] P/P
• OXATIAPIPROLIN 10% [OD] P/V
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• PROPAMOCARB 52.5% (HYDROCHLORIDE) + FLUOPICOLIDE 6.25% [SC] P/V
• PROPAMOCARB 60.5% (c. hydrochloride) [SL] P/V
• PROPAMOCARB 60.5% (as hydrochloride) [SL] P/V
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
• TRIBASIC COPPER SULFATE 40% (EXPR. IN CU) [WG] P/P
Authorized treatments in organic farming
• ORANGE OIL 60g/L [ME] P/S
• CUPRIC HYDROXIDE 13.6% (EXPR. IN CU) + COPPER OXYCHLORIDE 13.6% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 20% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 25% (EXPR. IN CU) [WG] P/P
• CUPRIC HYDROXIDE 36% (EXPR. IN CU) [SC] P/V
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 37.5% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 38% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 52% (EXPR. IN CU) [SC] P/V
• COPPER OXYCHLORIDE 70% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
• CUPROCALCIC SULFATE 20% [WP] P/P
• TRIBASIC COPPER SULFATE 19% (EXPR. IN CU) [SC] P/V
• TRIBASIC COPPER SULFATE 40% (EXPR. IN CU) [WG] P/P
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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To prevent and control downy mildew caused by Pseudoperonospora cubensis, it is essential to implement integrated pest management measures. This includes rotating crops to avoid the buildup of spores in the soil, using resistant varieties when possible, removing infected plants to reduce the spread of the pathogen, and controlling moisture through proper irrigation practices, such as Drip irrigation and proper spacing between plants to improve air circulation. In addition, the use of specific fungicides can be effective in controlling the disease, although they must be applied preventively and following the dosage recommendations to avoid pathogen resistance.
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