Once we mention Clubroot, we think most people will think of Clubroot of cruciferous vegetables. Yes, Clubroot is the biggest headache for cruciferous vegetables. Because of its uniqueness, many products cann’t have a satisfied control result. Now let us see why it’s so difficult to control:
Symptom
After the crops are infected by Plasmodiophoromycetes, it will form spindle-shaped tumors with different sizes on the roots. The crops’ aboveground parts will grow slowly, turn yellowish and then wilt.
Prefered environment
Acidic and humid soil will benefit pathogens’ infection and spores’ germination. If there are pathogen in the soil, it’s possible for the crops to be infected and the difference is only the severity.
Mode of transmission
The resting spores in the soil mainly spread by the infected crops and water’s moving.
Pathogen
The fungus can be devided into higher fungus and lower fungus. In Lower fungus, the most infective are Pythium, Peronospora and Phytophthora in Mastigomycotina. Though Plasmodiophoromycetes also belongs to Mastigomycotina, but it’s a individual category. So the common products for controlling lower fungus like Dimethomorph, Propamorcarb cann’t have good control result. However, the interesting thing is that products like Carbendazim, Thiophonate-methl have certain efficiency to control.
Plasmodiophoromycetes is a weak parasite and can survive in many adverse environments and, in soil, it can live more than 10 years.
Prevention & Control
From the view of disease triangle theory, what we can do is to start with environment’s improvement and applying suitable products:
1: Crease better Soil condition
Apply Purple-Bull Organic Fertilizer and Humix Blackgold to regulate the soil’s PH value, lift the organic matter’s content in the soil and expand the beneficial bacterias colony; Improve the drainage condition to decrease the humidity of the soil;
2: Apply fungicides
The common solutions are: Soil disinfection by Carbendazim 50% SC or Thiophonate-methyl 70% WP before planting; after infection, use Carbendazim 50% SC, Thiophonate-methyl 70% WP or Hymexazol 30% AS to do root treatment. But the result is not satisfied sometimes;
We suggest:
Before sowing or transplanting the cruciferous vegetables, use our Fluazinam 50% SC to spray on the land or onto the transplanting holes, then mix the soil uniformly. After many trials, the control result could be around 80% and the treated crops had vigorous growth and satisfied yield.
