Mildiu
Mildew
Bremia Lactucae
Pathogen:
Oomycete
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Bremia lactucae is an oomycete fungus that causes the disease known as downy mildew in lettuce plants. This pathogen has a complex life cycle that involves spores produced in structures called sporangia, which are spread through the air or water and can survive in the soil for long periods in the form of oospores. Under conditions of high humidity and moderate temperatures, spores germinate and form specialized structures called appressoria, which allow them to penetrate plant tissues and cause infection.
SYMPTOMS
Downy mildew is a disease that affects lettuce plants, causing symptoms such as chlorotic and necrotic Taches on the leaves, stems and flowers. In addition, white, powdery mycelial growth can be observed on the underside of infected leaves. General symptoms include premature defoliation of plants and reduced yield.
- Chlorotic and necrotic Taches on the leaves.
- White, powdery mycelial growth on the underside of the leaves.
- Premature defoliation of plants.
- Reduced performance.
TEMPERATURE AND HUMIDITY
10-25°C
90-100%
HOW IS IT SPREAD?
Wind, irrigation water, direct contact with infected plants, contaminated soil
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
• AMISULBROM 20% [SC] P/V
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• CYMOXANIL 2.85% + FOSETIL-AL 30% + COPPER OXYCHLORIDE 16% (EXPR. IN CU) [WG] P/P
• CYMOXANILE 4% + FOLPET 25% + FOSETIL-AL 50% [WP] P/P
• 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
• POTASSIUM PHOSPHONATES 51% (Exp. as phosphorous acid) [SL] 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
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• LAMINARIN 4.5% [SL] P/S
• MANDIPROPAMID 25% [SC] P/V
• MANDIPROPAMID 25% + OXATIAPIPROLIN 3% [SC] P/V
• METALAXIL 25% [WP] P/P
• METIRAM 70% [WG] P/P
• OXATIAPIPROLIN 10% [OD] P/V
• COPPER OXYCHLORIDE (Exp. in Cu) 52% [SC] P/V
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. 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
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• PROPAMOCARB 52.5% (HYDROCHLORIDE) + FLUOPICOLIDE 6.25% [SC] P/V
• PROPAMOCARB 60.5% (c. 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 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
• CUPRIC HYDROXIDE 50% (EXPR. IN CU) [WP] P/P
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE (Exp. in Cu) 52% [SC] P/V
• COPPER OXYCHLORIDE 14% (exp. in Cu) + CUPRIC HYDROXIDE 14% (exp. 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
• CUPROUS OXIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROUS OXIDE 75% (EXPR. IN CU) [WG] P/P
• 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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- Maintain adequate spacing between plants to improve air circulation.
- Avoid excess humidity in the environment and in the soil through adequate irrigation and the use of mulch.
- Apply preventive fungicides with specific action before the appearance of symptoms.
- Remove and destroy the remains of infected plants to reduce the source of inoculum for the fungus.
- Rotate crops to interrupt the pathogen life cycle and reduce disease pressure on the soil.
Recommendations
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