Bacteriosis
Angular Spot
Pseudomonas Syringae Pv. Lachrymans
Pathogen:
Bacterium
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Pseudomonas syringae, known as angular spot, is a phytopathogenic bacteria that affects a wide range of plants, including cucurbits. It is an opportunistic pathogen that can survive and multiply in conditions of humidity and moderate temperatures. This bacteria is capable of penetrating plant tissues through natural wounds or wounds caused by insects or other stress factors. Once inside the plant, Pseudomonas syringae multiplies and causes damage, resulting in the appearance of characteristic symptoms on the leaves, stems and fruits.
SYMPTOMS
The disease caused by Pseudomonas syringae in cucurbits is known as angular spot. Symptoms include the formation of dark brown or blackish triangle-shaped Taches on the leaves, with an angular appearance that follows the edges of the tissues. These Taches can expand rapidly and cause tissue necrosis, leading to defoliation and weakening of the plant.
TEMPERATURE AND HUMIDITY
15°C - 25°C
60% - 80%
HOW IS IT SPREAD?
Irrigation water, rain, direct contact between plants, cultivation equipment.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• FOSETIL-AL 80% [WP] P/P
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (EXPR. IN CU) [WG] P/P
Authorized treatments in organic farming
• COPPER OXYCHLORIDE 25% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 50% (EXPR. IN CU) [WP] P/P
• CUPROCALCIC SULFATE 20% (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 angular spot in cucurbit crops, it is important to implement integrated pest management practices. This includes removal of infected plants, proper pruning to improve air circulation, use of healthy seeds and seedlings, and preventative treatment with bactericides.
Recommendations
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