Spinach root rot control method

The main damage seedlings, the adult stage can also be disease. At the beginning of the disease, only the individual roots and roots were susceptible, and gradually expanded to the main root. After the main root was affected, the early plants showed no symptoms. As the degree of decay of the roots intensified, the function of absorbing water and nutrients gradually weakened. Due to the shortage of nutrient supply, when the light is strong and the evaporation amount is high before and after noon, the upper leaves of the plants only appear wilting, but they can recover at night. When the condition is serious, the wilting condition can no longer be restored at night. At this point, the root bark became brown and separated from the pith, and finally the whole plant died. The disease is often similar to the symptoms of roots and is a fungal disease. Bacteria in the soil and sickness on the winter, usually in late March to early April onset, in May to enter the peak of onset, its occurrence and climate conditions are very important. The low temperature, high humidity and lack of light in the seedbed are the main environmental conditions that cause the disease. The soil of the nursery is sticky, easy to compact, and has poor ventilation, so that the growth of the root system is hindered, and it is also easy to develop. In addition, after the roots are harmed by underground pests and nematodes, there are many wounds and invasion of pathogenic bacteria. Under this circumstance, not only the sowing and cutting herbs and flowers are vulnerable to damage, but also the woody flowers such as Chinese rose, Hibiscus syriacus, and Hibiscus syriacus that are used for cutting, ramets, and inoculation, are susceptible to disease.

Control methods

1. Seed, cuttings disinfection. Before sowing, the seed can be seeded with trifenfon with seed weight of 0.3% or seed weight of 0.1%, or soaked with 80% of 402 antibacterial agent emulsifiable concentrate 2000 times for 5 hours; the same concentration of the drug can be used at the base of the cutting. Liquid immersed for 1 hour after cutting.

2. Seedbed soil disinfection, 5 grams per square meter with 5 grams of carbendazim sprinkled in the ground surface into the soil, or with 3 grams of 75% pentachloronitrobenzene have good effect, and can be both damping-off, blight.

3 . Chemical control. At the time of onset, the pathogen can be sprayed or irrigated with the diseased gram of 1500 times; or 80% of 402 280 grams of emulsifiable oil can be rooted.

4. Timely prevention and control of underground pests and nematodes.