Hazardous characteristics: bacterial bacterial leaf spot disease, also known as bacterial leaf spot disease, it mainly harms leaves, stems, flowers, petiole and fruit. The leaves are susceptible, producing dark brown to black irregular spots, 2-4 cm in diameter with or without yellow halos around the spots. Petioles and stalks have similar symptoms, producing black spots but no yellow halos around the lesions. Lesions are easily linked to plaques, and when severe, a section of the stem becomes dark. The flower buds are affected and many black spots are formed on the sepals. When they are contiguous, the sepals are dried and cannot normally bloom. The small spots in the early stage of the young fruit swell slightly, and the lesion often remains green for a long time around the fruit. Flesh near the lesion sunken, black spots around the lesion, the middle light and slight depression.
Occurrence pattern: The pathogen of tomato bacterial spot disease is Pseudomonas syringae pv tomato. Germs can overwinter on tomato plants, seeds, diseased bodies, soils, and weeds. They can survive on dried seeds for 20 years and can be spread over long distances with seeds. Seeding of seed with bacteria can cause disease, seedlings spread into the field after the onset of disease, and spread through rain, insects, and agricultural operations, resulting in an epidemic; as long as 10% of the initial plant disease occurs in the field, it can be transmitted to the entire plot, temperature Conditions below 25°C and relative humidity above 80% are conducive to disease occurrence.
Control methods First, agricultural control. Strengthen quarantine to prevent the introduction of infected seeds into the non-epidemic area; select disease-resistant and disease-resistant varieties; establish disease-free seed fields, adopt disease-free seedlings; implement rotation for more than three years with non-sweet-end vegetables; pruning, snoring, and harvesting Other agricultural operations should pay attention to avoid the spread of diseases; drip irrigation or furrow irrigation should be used in drought areas to avoid sprinkler irrigation as much as possible. Second, seed processing. Soaking in warm water at 55°C for 30 minutes, or soaking in 0.6% acetic acid solution for 24 hours, or soaking in 5% hydrochloric acid for 5-10 hours, or soaking in 1.05% sodium hypochlorite for 20-40 minutes. After soaking, rinse the liquid with water and let it dry before germination. Third, chemical control. In the early stage of disease, 77% of the WP can be used to kill 400-500 times, or 53.8% can be used to kill 2000 times of the 2000 dry suspension agent, or 20% of Thiabendazole (Longket) suspension 500 times. Or 14% complex ammonia copper water agent 300 times, or 0.3% -0.5% copper hydroxide solution to control, spray once every 10 days or so, even spray 3-4 times.
Highway fog lights
Many highways use traffic lights and fog lights. The products of highways are actually stable and durable. It can`t be said that one product can be used for one year. The highway is a major investment in a national infrastructure project. If each product is only used for one year, it is really too much waste. Therefore, when choosing highway electromechanical products, especially 304 stainless steel fog lamps, 304 stainless steel is used, it is best to choose the best materials. If you do this, you might get a little more money at the beginning, but in the end he will achieve completely different results.
Stainless steel fog lights and traffic lights,
Many expressway electromechanical projects have been noted during the bidding. The lights at the entrance of the expressway must be made of stainless steel and made of primary colors, that is, its color does not need to be sprayed. Why? Because the material of 304 is relatively good, then 304 will not rust. After many years, its color will be as smooth as new. Therefore, this material has a very good quality for the entire highway mechanical and electrical product entrance, passage entrance and exit. Big one system improvement
Iron fog lamp
Are there any traffic lights and fog lights made of iron or plastic? The answer is yes. For many highway electromechanical projects, the owners themselves need very good things, but after bidding, after layer by layer, 316 stainless steel will change. It becomes 304, 304 stainless steel becomes an iron box, and the iron box finally becomes a plastic material. In fact, this is very bad.
What is 304 stainless steel? Stainless steel refers to a kind of stainless steel that is not easy to rust under normal conditions, and its surface is the original color, which means that it is black and white, and looks very high-grade, just like the stainless steel seat you see in an airport. The chair is the same, so the stainless steel is made into stainless steel fog lamps and stainless steel traffic lights, it looks very beautiful, and then after the surface is drawn, it looks even more high-end and high-end.
How many years can 304 stainless steel traffic lights and 304 stainless steel fog lights last? 304 stainless steel fog lights, 304 stainless steel traffic lights, they can basically be used for 5 to 8 years, because why, the shell will not rust, and the components inside will be protected after the shell does not rust. The LED itself is normal. The following can be used for 5~10 years, so the stainless steel material protects the internal components from moisture, and it will not cause damage to the internal components due to rust.
Highway fog light,solar warning traffic light,solar warning flashing light
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