The prevention and control of pest-free vegetables should implement the principle of “prevention as the main, comprehensive prevention and controlâ€, based on the optimization of production bases and agricultural (ecological) prevention and control, biological control, physical control, and the principle of harmless treatment of pests and diseases through reasonable chemical control. .
First, ecological control
Mainly through the regulation of environmental factors such as temperature and humidity and cultivation measures and other ecological factors, so that pests and diseases can be effectively controlled to reduce the amount of chemical pesticides and eliminate pollution residues.
1. Temperature regulation. The more scientific temperature changes in the winter greenhouse are: the temperature rises to 16°C-18°C in one hour after sunrise; the temperature in the shed reaches 23°C-25°C at 10 o'clock; the temperature exceeds 28°C in 10 o'clock and 13 o'clock and exceeds 30 o'clock. °C to ventilate to cool; after 14 o'clock, the temperature gradually decreased, the temperature dropped to 18 °C when the shade cover; about 16 °C in the middle of the night, before midnight to 10 °C above sunrise.
2. The regulation of light. In winter, there are many foggy days and weak light. In addition, the reflection of light from the film on the shed, the effect of water droplets on the membrane, and the lack of light in the shed. Therefore, in addition to the shed surface with no drip film, you can also hang aluminized reflector screen on the north wall of the shed.
3. Moisture regulation. Can be used under the film dark irrigation, drip irrigation under the membrane and other technologies to reduce the humidity within the greenhouse to reduce the occurrence of pests and diseases.
4. The regulation of the gas. The low concentration of carbon dioxide in the greenhouse affects the photosynthesis of vegetables, resulting in weak plant growth and poor disease resistance. Therefore, carbon dioxide gas fertilizer should be added to enhance plant growth and disease resistance.
5. Reasonably mix vegetables. In addition to doing a good job of crop rotation to avoid heavy crops, greenhouses and nearby plots avoid the mixing of cucumbers, eggplants, beans, etc., to reduce the interactive transmission of pests and diseases.
Second, biological control
1. Protect and use natural enemies, such as ladybugs, spiders, grasshoppers, parasitic bees, frogs, etc.
2. Adopt honeybee pollination technology. Bee pollination can reduce the triple phenomenon caused by hormone use (carcinogenic, teratogenic, mutagenic).
3. Treat insects with bacteria. Such as using Bacillus thuringiensis (BT) control cabbage caterpillar, cotton bollworm and other Lepidoptera pests.
4. Apply antibiotics to treat the disease. Such as the application of agricultural resistance 120 to prevent cucumber, watermelon wilt, powdery mildew, anthrax, etc.; with agricultural streptomycin control cucumber, sweet pepper, tomato bacterial diseases.
5. Use antibiotics to treat pests. Such as the application of Liuyangmycin control leafhopper; avermectin control of diamondback moth, beet armyworm, root knot nematode and so on.
Third, physical control
1. Use shade net covering technology. The application of shade net covering technology can mitigate summer heat, strong light, heavy rain, pests and diseases, and create environmental conditions suitable for the growth of vegetables.
2. Use bagging technology. After melon and watermelon are bagged, the chance of pest invasion is blocked. It can effectively prevent the invasion and harm of pests and various diseases, and improve the smoothness of the melon surface. In addition, after bagging, direct contact between the pesticide and the melon surface is avoided, and the pesticide residue on the fruit can be greatly reduced.
3. Use insect nets to prevent insects. After the application of insect nets, a variety of pests, in particular pests (Coleoptera, Coleoptera, etc.) cannot enter, cutting off the intrusion route and reducing the amount of chemical pesticides. At the same time, the Insect Network can relieve the torrential rain and hail damage.
4. Application of vibration lamp kill insects. After the application of the frequency-vibrating lamp, the base number of pests was significantly reduced, the damage was reduced, and the amount of pesticides was greatly reduced. At the same time, the killing of natural enemies is reduced, which not only benefits the ecological balance, but also optimizes the environmental conditions, and the quality of vegetables is significantly improved due to the reduction in the amount of drugs used.
5. Apply traps to attract insects. Insect traps are used in greenhouses to control whitefly in more than 25%.
Fourth, chemical prevention
In terms of chemical control, it is forbidden to use banned pesticides with high toxicity, high residue, and high levels, to strengthen the prediction and prediction of pests and diseases, eradicate pests and diseases in the bud, inhibit their proliferation, and reduce losses to a minimum. In the use of pesticides, it is necessary to give full play to the effectiveness of pesticides, but also to minimize the side effects of pesticides to reduce pesticide residues in vegetable production to the national standards. To implement Putian medication and control field medications, it is necessary to promptly use drugs to increase the lethality and control efficiency of pesticides against pests, implement curbs, reduce general management, reduce dosage, formulate and use pesticides in accordance with prescribed dosages and concentrations, and master correct application methods. . To rotate medications, strictly control the safety interval of pesticide use, and reasonably apply pesticides.
Does the solar PTZ Camera System Kits work well
In fact, there are no network and no electricity cameras, but they have certain limitations. The working time of a camera with batteries or external solar panels is limited.Monitoring without network means that mobile phones and cameras can only be seen within a certain range of 5~10 meters.
Therefore, no network and no power is just a gimmick. We must pay attention to distinguish when buying.
Is the Solar Camera easy to use
Jiajie intelligent surveillance camera is very good
Advantages and disadvantages of solar monitoring
Probably.
Generally, offline display has the following two conditions.
One is that the installed 4G card has no traffic and cannot provide network connection for monitoring;
The other is that there is a problem with the signal receiving device, which makes it unable to connect to the network. Therefore, the user can access the APP connected to the monitor to check whether there is still traffic on the 4G card. If there is still traffic, there is a problem with the monitoring; If there is no traffic, the renewal fee can continue to be used.
Which is the best solar Outdoor Camera
It may be that the poor contact of the power plug causes power on, heating and power failure, or it may be that the camera's internal control motherboard fails, causing power on for several minutes and automatic power off protection.
The camera works continuously, and the internal chip may overheat, which also exists in many SLR cameras. Some cameras impose time limits on continuous shooting. Centralized power supply with high-power switching power supply
Disadvantages of camera solar power supply
The main advantages of solar photovoltaic power generation are:
(1) Simple structure, small and light volume;
(2) Easy to install, easy to transport, short construction period, and short time to obtain energy;
(3) It is easy to use and maintain, and can work normally in the temperature range of - 50 ℃~- 65 ℃;
(4) Safe, reliable, noiseless, pollution-free, and absolutely clean (pollution-free);
(5) The advantages of building roofs can be used without the restriction of resource distribution regions; For example, areas without electricity and areas with complex terrain;
(6) The rate of price reduction is fast, and the time for energy repayment may be shortened;
(7) It can be matched with the battery to form an independent power supply, or it can be connected to the grid for power generation.
(8) Local power generation and supply without fuel consumption and transmission lines
The main disadvantages of solar photovoltaic power generation are:
(1) Low solar energy density and large coverage area;
(2) Photovoltaic power generation is intermittent and random;
(3) Solar energy resources in various regions are not available, so photovoltaic power generation is highly regional.
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