
Cercosporosis
Leaf blight and purple seed spot: what it is, how it originates, and how to eliminate it effectively.
Leaf Blight And Purple Seed Spot
Cercospora Kikuchii
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE



DESCRIPTION
WHO CAUSES IT?
Leaf blight, caused by the pathogen Cercospora kikuchii, is a fungal disease that affects various crops, including soybeans. This fungus is able to survive on the remains of infected plants in the soil for long periods, making it a persistent threat to agricultural crops.
SYMPTOMS
In soybeans, leaf blight causes dark brown to black leaf Taches to appear on the plant's leaves. These Taches are usually surrounded by a yellowish halo and can coalesce, forming larger necrotic areas. As a result, leaves may turn yellow prematurely and drop, which can reduce crop yield.



TEMPERATURE AND HUMIDITY
20°C - 30°C
80% - 90%

HOW IS IT SPREAD?
Infected seeds, plant remains, contaminated soil, irrigation water, agricultural tools, wind.

HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• LAMINARIN 4.5% [SL] P/S
Authorized treatments in organic farming
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• LAMINARIN 4.5% [SL] P/S
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 leaf blight in soybean crops, it is important to implement integrated pest management practices. This includes crop rotation, removal of infected crop residues, use of resistant varieties, and timely application of specific fungicides.






















