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Gray Rot

Botrytis Cinerea

Pathogen:

Fungus

Type:

Risk:

INTERMEDIATE

DESCRIPTION

Description of the pathogen

Botrytis cinerea is a filamentous fungus that causes the disease known as gray mold or botrytis. This pathogen is a common problem in a wide variety of plants, including cannabis. It is characterized by developing a grayish layer of mycelium on the leaves, stems, flowers and fruits of the plant, which can spread quickly if not properly controlled.

Description of the disease

Symptoms of botrytis in cannabis include brown or necrotic Taches on leaves, stems and flowers, covered with a grayish layer of mycelium. As the disease progresses, these Taches can expand and rot the plant from within, causing a deterioration in crop quality and, in severe cases, total crop loss.

TEMPERATURE AND HUMIDITY

15°C - 25°C

80% - 95%

TRANSMISSION ROUTES

Wind, direct contact, transport of plant material.

Chemical treatments

CONTROL

• AZOXISTROBIN 25% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• PHENHEXAMIDE 50% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P

Authorized treatments in organic farming

• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S

Biological control

• BACILLUS AMYLOLIQUEFACIENS (strain FZB24) 13% [WP] P/P
• BACILLUS AMYLOLIQUEFACIENS (MBI 600 strain) 11% [WP] P/P
• BACILLUS AMYLOLIQUEFACIENS (subsp. plantarum, strain D747) 25% [WG] P/P
• BACILLUS AMYLOLIQUEFACIENS subsp. plantarum (strain D747) 5% [SC] P/V
• BACILLUS SUBTILIS (strain IAB/BS03) (1 x 10E8 cfu/ml) 10 g/l [SL] P/V
• BACILLUS SUBTILIS (STRAIN QST 713) 1.34% [SC] P/V
• CLONOSTACHYS ROSEA CEPA J1446 (GLIOCLADIUM CATENULATUM (CEPA J1446)) (1 x 10E 9 cfu/g) 900 g/kg [WG] P/P
• GLIOCLADIUM CATENULATUM (STRAIN J1446) 32% (2 X 10E8 CFU/G) [WP] P/P
• PYTHIUM OLIGANDRUM (strain M1) 17.5% [WP] P/P

Preventive treatments

• AZOXISTROBIN 25% [SC] P/V
• BACILLUS AMYLOLIQUEFACIENS (strain FZB24) 13% [WP] P/P
• BACILLUS AMYLOLIQUEFACIENS (MBI 600 strain) 11% [WP] P/P
• BACILLUS AMYLOLIQUEFACIENS (subsp. plantarum, strain D747) 25% [WG] P/P
• BACILLUS AMYLOLIQUEFACIENS subsp. plantarum (strain D747) 5% [SC] P/V
• BACILLUS SUBTILIS (strain IAB/BS03) (1 x 10E8 cfu/ml) 10 g/l [SL] P/V
• BACILLUS SUBTILIS (STRAIN QST 713) 1.34% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• CLONOSTACHYS ROSEA CEPA J1446 (GLIOCLADIUM CATENULATUM (CEPA J1446)) (1 x 10E 9 cfu/g) 900 g/kg [WG] P/P
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• PHENHEXAMIDE 50% [SC] P/V
• GLIOCLADIUM CATENULATUM (STRAIN J1446) 32% (2 X 10E8 CFU/G) [WP] P/P
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
• PYTHIUM OLIGANDRUM (strain M1) 17.5% [WP] P/P

To prevent and control botrytis in cannabis crops, it is essential to maintain optimal growing conditions that reduce humidity and improve air circulation around the plants. In addition, it is recommended to avoid excessive watering and overcrowding of plants, regularly remove infected leaves and flowers, and apply specific fungicides when necessary.

Recommendations

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*The recommended treatments are recommendations based on the authorities' databases and in no way replace the guidelines established by the legislation of each country.