First, the cause of the disease Pinellia growth to the 8-10 month, that is, into the mildew season, the second generation, the third generation, the fourth generation of Pinellia formed in the early spring planting bulbs and the summer generation of the Pinellia formed a generation, the second generation of bulblets quickly It enlarges, forms a tuber, and the parental stem that was planted at the time of cultivation also enlarges itself. This period is the fastest growing stage of tubers in Pinellia ternate, and it is also the weakest period of invasive ability of Pinellia tubers. The bigger the tubers, the weaker the resistance, the smaller the tubers and the stronger the defense ability of the bulblets. The rapid growth of tubers of Pinellia ternata with various specifications underground requires the absorption of a large amount of oxygen and organic matter in the soil. During this period, the microorganisms in the soil are also quite active and reproduce rapidly. They also need a lot of oxygen, and they also emit a variety of harmful Gases and substances. During this period, when there is continuous rain, heavy soil moisture or soil compaction, and the gas in the soil and air cannot be exchanged in time, it is in the rapidly expanding period of Pinellia tubers, and the ability of the protective layer of the outer layer to protect against low infection is weak. A large number of harmful gases and pathogens can easily invade the tubers of Pinellia sinensis and spread rapidly, causing the tubers of Pinellia terrestris to decay in a relatively short period of time. The light ones rot 80% a week, resulting in heavy land mass, 3-5 days, and a half. In the summer, the tubers were completely rotted, and the odor odor was emitted from the soil and air throughout the plot. The pinellia tuberculosis, which caused Banxia's army to annihilate and manage hard, received only a few buds and some small tubers at the time of harvest, causing serious losses to Pinellia production. This rot disease was one of the major bottlenecks restricting Pinellia production.
Second, the pathological characteristics of bacteria infecting the early stages of tuber in Pinellia, there are irregular black spots around the tuber, this spot is rapidly expanding around, after 3-4, many pathogenic spots together, continue to invade the inside of the tuber, At this point, the root system of Pinellia began to shrink, and the leaves on the ground gradually turned yellow from the green and withered. One week later, the tubers of Pinellia sinensis were round blisters, like ripe grapes. The tubers were full of black water and the whole plant died. Finally, only a thin skin was left. The spread of germs will quickly infect other Pinellia tubers, causing the entire Pinellia plot to infect and rot in a short period of time. The soil and air in the cultivated Pinellia exudes an unpleasant odor.
Third, control methods
1. Select varieties: plant Pinellia ternata, choose Pinellia cultivar with strong disease resistance and strong growth, such as “leafletâ€, “leaflet†and other leaf-shaped fine varieties, select disease-free tubers or bulb buds as stems .
2. Stem treatment: Before sowing, the selected stems must be treated and disinfected, such as drying seeds and dressings, to prevent germs in the stems themselves.
3, land selection: must choose loam or sandy loam, PH value between 6.5-7 plots plant Pinellia, and in the past there has been no root rot or rot disease. In autumnal and rainy areas, the selected plot should have a slope of 20%. In plain areas and flatter plots, when planting the pre-Pan summer planning, it is necessary to interpolate every other raft, leaving a width of 30 cm and a depth of 30. The centimeters of the drainage ditch ensure that the water in the soil of the Banxia Tanaka can completely penetrate into the drain when encountering rainy weather, and the land can be discharged in time.
4. Remedial measures: In the event of continuous rainy weather and relatively moist soil, as long as it can be cultivated in the middle of the field, it is necessary to carry out many types of cultivating loose soil in order to break the hardened layer of soil and eliminate harmful gases in the soil. The introduction of fresh oxygen increases the gas exchange between soil and air. This measure can effectively prevent and reduce the occurrence of rot disease.
5. Rotten Stem Harvest: In the mid and late growth stages of Pinellia ternata, if continuous rainy weather and high soil moisture are encountered, check the growth conditions of Pinellia ternate. If some Pinellia plants are found to have rot, in this case, whether or not To the harvest season, should be promptly to seize the harvest, not delaying the date, otherwise, tuber rot quickly, the first rotten, after the rotten small, resulting in reduced or even out of production. At the same time as emergency harvesting, the tubers of Pinellia ternate that are harvested from the wet mud should be peeled and processed immediately. Therefore, the fresh tubers are still rot inside. If they are not processed, most tubers will be rotted after 1-2 days. Do not care about the drug farmers.
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