What are the control methods for root rot in red sage (Salvia miltiorrhiza)?
How do you control root rot in red sage? Please provide an introduction. Red sage root rot: 1. Harmful symptoms: Red sage root rot occurs in hot, rainy seasons and harms the plant's roots. In the early stage, only a few roots or part of the underground rhizome become diseased first, gradually spreading to the entire root system. After the roots are damaged, wet rot occurs, the outer skin turns black,...
How do you control root rot in red sage? Please provide an introduction.
Red sage root rot:
1. Harmful symptoms: Red sage root rot occurs in hot, rainy seasons and harms the plant's roots. In the early stage, only a few roots or part of the underground rhizome become diseased first, gradually spreading to the entire root system. After the roots are damaged, wet rot occurs, the outer skin turns black, and in the early stage of aboveground disease some branches and leaves wither and die; in severe cases, the entire plant withers and dies. It occurs to varying degrees in all red sage production areas, causing certain losses.
2. Control methods
1. Practice crop rotation: Because the soil carries the pathogen, continuous cropping of red sage leads to early onset, severe disease, and rapid spread. It is best to rotate with gramineous crops for 3-5 years to reduce the pathogen population and lower the disease incidence.
2. Healthy seed selection: Choose disease-resistant varieties; select robust, disease-free seed roots; do not save seed from diseased fields, to reduce disease.
3. Strengthen field management: Fertilize rationally, apply more organic fertilizer, and increase phosphorus and potassium fertilizer; drain standing water promptly during the rainy season, and pay attention to loosening the soil to improve the plants' disease resistance.
4. Chemical control: Per mu, mix 1 kg of 70% dexon wettable powder or 50% carbendazim wettable powder with 3 kg of fine soil, and scatter it into the holes when planting, which has a certain control effect; disinfect cuttings and rhizome heads by soaking them in 800 times dilution of 50% Tuzet wettable powder or 1000 times dilution of 70% thiophanate-methyl wettable powder for 3-5 minutes, then dry them and plant; apply pesticide during the growing period by pouring fungicide around the roots of diseased plants in the early stage of red sage disease, which can control the spread of the disease. Commonly used pesticides include 500-800 times dilution of 50% Shujunling wettable powder or 50% dexon wettable powder, or 1000 times dilution of 96% copper sulfate, or 100-150 times dilution of 3% Nongkang 120 aqueous solution, applied once every 10-15 days for 3-4 consecutive times.
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