Mildiu
Downy Mildew
Peronospora Sp.
Pathogen:
Oomycete
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
The pathogen Peronospora sp. is an oomycete that causes downy mildew on several plants, including blackberries. This pathogen begins its cycle in the soil, where the oospores, resistant structures, can survive for long periods in infected plant remains. Under favorable humidity and temperature conditions, oospores germinate, producing motile zoospores that swim in the water film on leaves and other plant tissues. These zoospores penetrate plant tissues through the stomata, developing inside the plant. The pathogen forms sporangiophores that emerge through the stomata and produce sporangia on the surface of the leaves, which are dispersed mainly by wind and water, infecting new plants. This production of sporangia can be repeated several times during the growing season, especially under conditions of high humidity and moderate temperatures.
SYMPTOMS
In blackberry, downy mildew caused by Peronospora sp. It mainly affects the leaves, stems and fruits. The disease manifests itself as chlorotic or yellowish Taches on the upper surface of the leaves, while a grayish downy mold forms on the underside. This infection reduces the photosynthetic capacity of the plant, weakens the tissues and can lead to premature leaf fall and fruit loss.
- Chlorotic or yellowish Taches on the upper surface of the leaves.
- Grayish downy mold on the underside of the leaves.
- Reduction of the photosynthetic capacity of the plant.
- Weakening of plant tissues.
- Premature fall of leaves.
- Loss of fruits.
TEMPERATURE AND HUMIDITY
10°C - 22°C
80% - 100%
HOW IS IT SPREAD?
Wind, Water, Contaminated tools, Infected plant material
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 60g/L [ME] P/S
• POTASSIUM PHOSPHONATES 51% (Exp. as phosphorous acid) [SL] P/V
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
Authorized treatments in organic farming
• ORANGE OIL 60g/L [ME] P/S
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• CUPROCALCIC SULFATE 12.4% (EXPR. IN CU) [SC] P/V
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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- Regularly monitor the crop to detect the first signs of the disease.
- Use blackberry varieties resistant to downy mildew.
- Implement appropriate crop rotations to reduce pathogen pressure in the soil.
- Apply preventive and curative fungicide treatments following technical recommendations.
- Ensure good ventilation and adequate spacing of plants to reduce humidity.
- Avoid sprinkler irrigation, especially in the afternoon, to minimize the period of humidity on the leaves.
- Carry out sanitary pruning to eliminate affected parts and reduce the source of inoculum.
- Use physical barriers or covers to prevent the spread of spores by wind and water.
- Maintain good hygiene in the crop, removing and destroying infected plant remains.
- Apply biological treatments such as plant extracts or antagonistic microorganisms to control the pathogen.
Recommendations
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