What specific fungicide works well against gray mold?
Gray mold is a fungal disease that is common and relatively difficult to control in open-field and protected cultivation crops. It is a low-temperature, high-humidity disease. The pathogen grows at 20-30°C, and the disease peaks when the temperature is 20-25°C and humidity remains above 90%. It is caused by infection with Botrytis cinerea, and can affect flowers, fruits, leaves, and stems. Let's take a look below at what specific fungicides are available for controlling gray mold!
Pyrimethanil
Pyrimethanil is a new type of fungicide belonging to the anilinopyrimidine class, with a unique mechanism of action. It inhibits the production of enzymes that the pathogen uses for infection, thereby preventing infection and killing the pathogen. Its mechanism of action is unique, and it is effective against gray mold strains that have developed resistance to commonly used non-anilinopyrimidine fungicides (benzimidazoles and carbamates).
Procymidone
Procymidone mainly inhibits the synthesis of triglycerides in the fungal cells. It has both protective and curative effects, has good systemic activity, and performs well under low-temperature and high-humidity conditions.
Carbendazim
A fungicide with negative cross-resistance to carbendazim. After entering the fungal cells, it binds to tubulin within the cells, thereby affecting cell division. This mode of action is very similar to that of carbendazim, but the two do not act at the same site. If gray mold develops resistance to carbendazim, it becomes highly sensitive to diethofencarb. Conversely, gray mold that is sensitive to carbendazim shows no inhibitory activity toward diethofencarb.
Diethofencarb
After diethofencarb enters the fungal cells, it binds to tubulin within the cells, thereby affecting cell division. It has cross-resistance with carbendazim and negative cross-resistance with carbendazim. Gray mold resistant to carbendazim is highly sensitive to diethofencarb. It is generally not used as a single agent.