Alternariosis
Leaf Spot
Alternaria Cucumerina
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Alternaria cucumerina is a phytopathogenic fungus that attacks cucurbits, such as pumpkins, cucumbers and zucchini. This pathogen is characterized by being a necrotrophic fungus, which means that it obtains nutrients from dead or dying plant cells. It has a wide geographical distribution and can survive on the remains of infected crops in the soil, as well as on contaminated seeds. Alternaria cucumerina produces abundant spores that are easily dispersed through air and water, contributing to its rapid spread in cucurbit crops.
SYMPTOMS
The disease caused by Alternaria cucumerina in cucurbits is known as leaf blight. Symptoms of this disease include the appearance of necrotic Taches on the leaves of affected plants. These Taches usually have a dark center surrounded by a yellow ring, and may expand as the disease progresses. Over time, leaves can wilt and drop prematurely, weakening the plant and reducing its ability to produce quality fruit.
TEMPERATURE AND HUMIDITY
20°C - 25°C
70% - 80%
HOW IS IT SPREAD?
Irrigation water, wind, direct contact between plants, cultivation equipment.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• BOSCALIDE 25.2% + PYRACLOSTROBIN 12.8% [WG] P/P
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• DIFENOCONAZOLE 12.5% + CYFLUFENAMIDE 1.5% [DC] P/V
• FLUDIOXONIL 50% [WG] P/P
• FLUXAPYROXAD 7.5% + DIFENOCONAZOLE 5% [SC] P/V
• 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
• METIRAM 70% [WG] P/P
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. 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 52% (EXPR. IN CU) [SC] P/V
• 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
• 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
• 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
• COPPER OXYCHLORIDE 30% (EXPR. IN CU) [WP] P/P
• COPPER OXYCHLORIDE 35% (exp. 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 52% (EXPR. IN CU) [SC] P/V
• 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
• 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 the spread of leaf blight caused by Alternaria cucumerina, it is important to implement integrated pest management practices. This includes removing infected plant debris, applying drip irrigation to avoid wetting the leaves, rotating crops, and using preventative fungicides.
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