Plantwise Factsheets for Farmers
Management of clubroot disease in cabbage using the soil solarization technique
Recognize the problem
is a root disease of cruciferous vegetables. It is caused by a soil-dwelling
fungus called Plasmodiophora brassicae.
Diseased plants have swollen roots, are stunted, and wither around noon when
weather is hot but recover in the evening when weather cools down. In
severe cases, the roots rot and plants die. This fungi-like organism which
causes clubroot disease spreads from point to point through contaminated soil,
farming equipment or
solarization is a technique of heating the soil by covering it with a plastic
sheet in hot weather so that some pathogens in the soil are killed. The soil
being treated should be moist. The moisture improves the heat conductivity of
the soil. The plastic sheet traps heat energy from the sun between itself and
the soil surface. In this situation, the soil becomes hot, causing some
pathogens such as Plasmodiophora
brassicae to die.
one or more pieces of black or clear polythene sheet (30 – 150 microns thick)
which can completely cover the field/area to be disinfested.
sure there will be hot weather for the coming 4 – 6 weeks, preferably in the
months of September and October.
the land to a depth of 25 – 30cm.
area so as to achieve minimal insulating airspace between the soil and
plastic sheet when it will be placed.
that the soil is moist. If no residual moisture is available, water the soil
the prepared piece of land with the plastic sheet. Ensure that the sheet is
secure enough – not to be blown away by wind. Security of the sheet can be
ensured by placing weighty stones or sticks on it.
the polythene sheet after 4 – 6 weeks and use the land to grow the crop. Do
not leave the plastic sheet for more than 8 weeks because this destroys the
The recommendations in this factsheet are relevant to:
Plantwise Factsheets Library app
Get all of the factsheets and pest management decision guides from this website in an offline format via the Plantwise Factsheets Library app.