Introduction to the Latest Control Methods for Clubroot of Rapeseed

Clubroot of rapeseed is a fungal disease that mainly damages the roots of rapeseed and often causes a serious decline in both the yield and quality of rapeseed. So what should be done about clubroot of rapeseed? Come and take a look at the control methods for clubroot of rapeseed with the editor.

1. Symptoms

Clubroot mainly appears on the roots. When the disease occurs, the roots form spindle-shaped or irregularly deformed “tumors”, mainly on the main root, with smaller ones on the lateral roots. In the early stage, the surface of the tumors is smooth and white, and later they gradually turn brown, become rough, and after a long time they also crack. In the early stage of the disease, at noon, because the temperature is relatively high and the transpiration of rapeseed is relatively strong, a lot of water is released, while the root system, damaged by the tumors, has a reduced ability to absorb water and nutrients. Because of the lack of water, the aboveground plants also wilt, and as the disease worsens, the diseased plants completely wilt and may even die.

2. Causes

First, the pathogen overwinters and oversummers in the soil, and the pathogen has extremely strong vitality and can survive in the soil for more than 10 years. In addition, long-term continuous cropping in diseased areas provides favorable conditions for the pathogen to reproduce. Also, because chemical fertilizers and chemical pesticides have been applied for a long time and the soil has not been improved, the soil has become severely acidified. Third, climate change: in recent years, after rapeseed transplanting, the temperature has been relatively high, and in addition the soil moisture is high, especially in some fields with low-lying terrain and after paddy fields are converted to dry land, the disease is severe.

3. Control Methods

To control clubroot of rapeseed, comprehensive measures should be adopted. First, rational crop rotation should be carried out, with a rotation of more than 5 years with non-cruciferous crops. When planting, choose varieties with strong disease resistance. When raising seedlings, it is recommended to use nutrient pot seedling raising, disinfect the seedbed before sowing, and cultivate virus-free seedlings. Before transplanting, soak the roots with lime water or a 1000-fold dilution of thiram, or use it as the settling water. When fertilizing, try to avoid large amounts of chemical fertilizer to prevent soil acidification. In diseased fields, lime can be used to change the soil so that the soil becomes slightly alkaline and the disease is reduced.

  The above is an introduction to the control methods for clubroot of rapeseed. We hope it can help you. If you want to learn more related knowledge, please keep following us.