Grey mold

Contributor: CABI
Date Compiled: 2024
Creative Commons "Attribution-Share Alike"
Botrytis cinerea (grey mould-rot); Symptoms on tomato stem (Solanum lycopersicum). Image copyright: ©Gerald Holmes, Strawberry Center, Cal Poly San Luis Obispo/via Bugwood.org - CC BY-NC 3.0 US

Prevention

Solution Production stage (if possible with reference to BBCH scale)
Aerate the greenhouse
From Sowing/Planting to Harvest
Use drip irrigation
From Sowing/Planting to Harvest
Avoid high crop density
Sowing/Planting
Clean the fields and reduce the number of bacteria sources
Using Bumblebee Pollination Instead of Dipping Flowers in Hormones

Monitoring

Solution
Check the flowers, fruits, and leaves every day from the early stage of fruit setting
Once you find gray mold on the surface of flowers and fruits or "V"-shaped spots on the leaf edges, start direct prevention and treatment

Control

Solution
Manually remove diseased leaves and fruits and bury them deep

Regulations surrounding chemical products can change rapidly – always verify chemicals recommended here with the most recent legislation and lists of products registered for your country
Solution Product Category Production stage (if possible with reference to BBCH scale) Max nb. of a. i. application/year Application Details and Notes (commercial product example) Chemical Group Risk resistance (FRAC Code)
Pyrimethanil
Synthetic fungicide
Start of treatments since there are favorable conditions for the development of infection. Suspend treatments 3 days before harvest
2
(SCALA®) Dosage: 2 L/ha.
AP - fungicides (Anilinopyrimidines)
Medium risk. (9)
Boscalid
Synthetic fungicide
When first symptoms occur
3 (Among Boscalid, Fluopyram, Pentyopirad, Fluxapyroxad, Isopyrazam)
(BAS 510 01 F) Contact fungicide with translaminar properties. Dosage 0,2 Kg/ha
SDHI (Succinate dehydrogenase inhibitors)
Medium to high risk. (7)
Iprodione
Synthetic fungicide
Polymycin
Synthetic fungicide
Procymidone 
Synthetic fungicide
The information made available here has been obtained from or is based upon sources believed by CABI to be reliable but is not guaranteed as to accuracy or completeness. Anyone acting or relying on such information does so entirely at their own risk. The efficacy of the IPM methods included above will depend on local conditions and might not always be suitable everywhere within the specified country.