Anthracnose is a fungal disease that can infect a wide range of cucurbit crops, including cucumbers, melons, squashes, and watermelons. It is caused by the fungus Colletotrichum orbiculare, which survives in the soil and on plant debris. The disease is most common in warm, humid weather, and can cause significant yield losses if not controlled. In mild cases may only cause minor blemishes on fruits, leading to decreased marketability but negligible yield loss. In severe cases it Can result in extensive fruit rot, defoliation, and plant death, leading to significant yield losses of 50% or more.
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- Type of Infestation: Disease
- Common Name: Anthracnose
- Causal Organism: Colletotrichum lagenarium
- Affected Parts Of the plant: Leaf, Fruit
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Environmental favorable factors for pests/Diseases:
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Temperature: 22-32°C (72-90°F). Warmer temperatures within this range accelerate disease development and spore germination.
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Humidity: High relative humidity (>90%) is crucial for spore germination, infection, and fungal growth.
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Symptoms of Pest/Disease:
- Leaves: Small, round, water-soaked spots that turn brown or black. The spots may grow together, causing the leaves to wilt and die.
- Stems: Elongated, sunken lesions that can girdle the stem, killing the plant above the lesion.
- Fruits: Round, sunken lesions that start out green and turn brown or black. The lesions may ooze a pink or orange liquid. Infected fruits may be inedible.
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Measures to control Pests/Diseases:
Products
Technical Names
Dosages
Metalaxyl-M 3.3% + Chlorothalonil 33.1% SC
300-400 ml/acre
Carbendazim 12 % + Mancozeb 63 % WP
300-400 grams per acre
Thiophanate Methyl 70% WP
250-600 grams per acre