In recent years, some western and melon production areas have discovered the hazard of fruit spot and invaded many kinds of crops such as balsam pear, resulting in reduced production. The fruit spot disease is a new disease that many people do not recognize. As a result, many melon farmers, pesticide operators and even agricultural technicians misdiagnose them and blindly use drugs, causing undue losses. The disease has great harm to the fruit, and the severer one causes deadly production; the seedlings are sick and the whole bed is dead; the adult's diseased stems and leaves are usually not caused by direct loss of yield. 1. Disease symptoms Watermelon sensibilities: Cotyledons appear as water-soaked spots, then turn into brown necrotic spots, often accompanied by yellow halos; true leaves have indistinct brown spots, and severe water-infested urea is limited by veins. Spots and lesions spread along the veins of the veins and are secreted by the lesions in high humidity conditions. Symptoms on the fruit vary from species to species, with water-soaked, dark green spots on the top of the peel, which then expand into irregular, water-soaked dark green patches. The initial disease department was confined to the skin, while the pulp tissue was still normal, but the commercial value of the watermelon had been significantly reduced and it could not be stored. The pathogenic bacteria and saprophytic bacteria in the middle and later stages of the disease turn the pulp into an immersed water, cracking the peel, and rotting the pulp. Thick skin muskmelon sensation: dark brown or dark green spots formed on the skin, some with water-like halos, spots usually do not expand; some varieties of bacteria invade the pulp caused by water immersion, brown rot or cork; Some varieties of lesions are limited to the epidermis, in the late conditions suitable for pathogens cause pulp decay. Cotyledons, true leaves, stems and vines can all be infested. Symptoms of true leaves are similar to downy mildew. The lesions are limited by the veins and spread along the veins to form dark brown water-soaked lesions. Traces of milky white bacteria secreted by pathogenic bacteria can be seen under high humidity conditions. The symptoms of bitter gourd are basically similar to that of melon. 2. Control methods 1 Disease-free seeds, disease-free fields, and healthy seeds from healthy plants. From the seedling stage, the diseased plants were immediately removed from the soil and moved to the field and burned. 2 Select disease-resistant varieties, the test proved that the degree of susceptibility between cultivars differs greatly. In the areas with severe disease, the original susceptible cultivars should be replaced and the resistant cultivars should be changed, such as triploid and diploid. Dark green lighter disease resistance. In China, the new Hongbao varieties have a higher level of susceptibility. (3) Seed treatment is carried out after seeds are sown with juice and pulp for 24 to 48 hours, then soaked in 1% hydrochloric acid for 5 minutes (or soaked in 1% calcium hypochlorite for 15 minutes). Wash with clean water and air dry. This method can kill the germs on the seeds. Before sowing, the seeds were soaked with 1% hydrochloric acid for 20 minutes and then rinsed with fresh water for 20 minutes, and then air-dried and sown. 4 rotations are simple and effective measures to prevent and control many pests and diseases. The longer the period of rotation, the better the control effect. 5 Strengthen management, implement deep-fall areas in autumn, turn sick bodies, wild hosts and pathogens into the depths of the soil or destroy their living environment, reduce the number of bacteria sources, and reduce the chance of infection. Set the airway, before planting a thick-skinned muskmelon planted, dig a groove 30 cm wide and 40 cm deep at the bottom of the planting hole. Spread 15-20 cm thick straw at the bottom of the ditch, cover the soil, and increase the ventilation of the roots. Sex, to ensure plant health, improve disease resistance, so that the body hair nets uniform, thick and beautiful. During field preparation, field diseased plants, diseased fruits, weeds and wild host plants were removed to reduce the sources of infestation and remove weeds in the field, especially cucurbit weeds. Sterilize farm utensils to kill germs. Use pipe irrigation such as drip irrigation or hoses to avoid sprinkler irrigation and top irrigation to reduce transmission. 6 Pharmacy control, disease in the field, copper preparations, antibiotics spray control. Application can kill other copper preparations should pay attention to the damage of watermelon and melon, it is best to do a good job consultation, test before use. Antibiotics can use agricultural streptomycin, tetracycline and other agents, spraying at the beginning of the disease, according to the weather and the incidence of infection every 7-10 days. Source: New Agriculture
Plasma Sterilizer
Plasma sterilizer is to sterilize by hydrogen peroxide low-temperature plasma.Through sterilization,a certain method is used to inactivate various microorganisms on medical instruments and surgical instruments,thereby achieving the purpose of sterilization.
1,Medical plasma sterilizer: sterilization temperature of 50°C± 5°C,low temperature and no humidity,no damage to the sterilization articles and equipment,can extend the life of precision instruments.
2.Medical plasma sterilizer green and environmental protection:hydrogen peroxide solution is used as sterilizing agent,no toxic substance remains,no drainage or exhaust is required,no damage to the operator's body,and special filters for high efficiency can be applied to the air intake and exhaust ports.Absorption of H2O2 from the process of vacuum rejection will result in zero pollution to the environment.
3.Medical plasma sterilizer sterilization stability:The sterilization chamber is made of aluminum or stainless steel,which has advantages of anti-corrosion and thermal conductivity,which makes the temperature of the sterilization chamber more balanced and effective, and ensures that H2O2 maintains 100% of the gas throughout the process.The hydrogen peroxide low temperature storage system ensures that the hydrogen peroxide concentration is stable and effective and does not volatilize.
4.High sterilizing efficiency:The design of a rectangular sterilization chamber makes it possible to load more instruments at a time and make the use of the sterilization chamber more convenient.
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Plasma Sterilizer
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