Downy mildew: Mainly harmful to cabbage, radish, cabbage, mustard and rapeseed. The bacteria spread by wind, rain, and water, and it is popular in rainy and wet weather. Yellow-brown irregular polygonal patches appeared on the diseased leaves and a layer of mildew-like fungus was grown on them. In the last year's heavy field, 70% enemy soil was used for disinfection. Before seeding, seeds were disinfected with 80% zeocin, 75% chlorothalonil, and 50% thiram with a seed weight of 0.4%. At the beginning of the disease, 40% of metalaxyl was applied alternately, 58% of metalaxyl MnZn 500 times, 50% of dexamethasone 800 times, 7~10 days, 2~3 times in succession. .
Soft rot: The main damage cabbage, radish, cabbage, cauliflower and so on. Bacteria spread with rain, farmyard manure, and insects, and they have become more common in October and November. The lesions are watery, and the outer leaves collapse to the ground. The interior decays into a hollow and has a strong stench. To prevent the disease, we must implement crop rotations to ensure the flow of water in the fields. Focus on the prevention and treatment of the fixed tree to the core period, and alternately use 72% of streptomycin 2000 times, neomycin, 3000 times, 72% of the enemy, 600 times of the enemy, 600 times of enemy liquid, and coarse water spray and dripping. Once in 15 days, use 2 to 3 times.
Viral diseases: cabbage, radish, rape, cabbage, broccoli, mustard, etc. occur, spread by locusts. The affected plants are short and the leaves are shriveled. When the cabbage is seriously ill, it cannot be wrapped. Prevention and treatment of the disease to treat aphid-based, after the emergence of the 6-leaf period of spraying 10% of the net 2500 to 3000 times the liquid or anti-influence 1000 times, 5 to 7 days. At the beginning of the disease, alternately spraying 5% mycorrhizal bactericide 300 to 400 times fluid, 20% virus A500 fluid, 10 to 15 days once, once every 2 to 3 times.
Sclerotinia: mainly endanger cabbage, radish, cabbage, rape, mustard, lettuce and so on. An oval-shaped water-stained, dark-brown spot appeared on the diseased leaf, and the diseased part rotted and perforated during the rainy season. White cotton flocculent hyphae and black murine bacillus nucleus were seen in the damaged stalk. In the initial stage of the disease, 50% carbendazim 500 times and 70% thiophanate-methyl wettable powder 1000 times can be sprayed alternately for 10 to 15 days.
Root canal disease: It occurs on cabbage and mustard, and it also harms mustard and radish. In the early stage of disease, the growth of the plant was slow, the base of the plant was yellow, and the whole plant died. The tumor appeared in the root. Prevention and treatment of the disease can be used for spreading mussels with 150kg of calcareous lime per acre for 7-10 days before transplanting. After transplanting, the water is poured into the hole with 15% lime water, and afterwards, if there is an onset center in the field, it can be irrigated 2 or 3 times. Pull out the diseased plant in time and burn it.
Toughening agent refers to the material that can increase the flexibility of adhesive film. Some thermosetting resin adhesives, such as epoxy resin, phenolic resin and unsaturated polyester resin adhesives, have low elongation and high brittleness after curing. When the adhesive parts bear external forces, they are easy to crack and rapidly expand, resulting in cracking of the adhesive layer, fatigue resistance, and can not be used for structural bonding. Therefore, we must try to reduce brittleness, increase toughness, improve the bearing strength. Any material that can reduce brittleness and increase toughness without affecting other major properties of the adhesive is a toughening agent. It can be divided into rubber toughening agent and thermoplastic elastomer toughening agent.
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