The potato late blight disease has occurred in varying degrees over the years, which has seriously affected the improvement of potato quality, yield and economic benefits. Therefore, it is extremely important to carry out the prevention and treatment of potato late blight. Potato late blight, also known as "epidemic disease," is a widespread and serious epidemic. Wherever there are potato crops in the region, non-resistant varieties of late blight in the epidemic, the field yield loss of up to 30%, cell loss 5% -10% lighter, more than 30% of the weight. Late blight not only harms potatoes, but also causes damage to tomatoes, peppers, eggplants, and so on. Symptoms of the disease: The leaves, stems, and tubers of the horseshoe potato are all affected. Symptoms generally occur before and after flowering. The diseased leaves were initially irregularly shaped tan-brown spots. When the climate was humid, the lesions quickly expanded, the edges were water-stained, and there was a circle of white moldy material. On the back of the leaf, there was a dense white mould, which formed a mold wheel. . When dry, the lesions stopped expanding, the diseased part became brown and brittle, and the edges of the lesions did not produce white mold. The stalks were damaged, with black streaks beginning to sag slightly. When the climate was humid, a small amount of white mold appeared on the surface. At the beginning of the damage, the tubers produce brown or purplish small lesions, which are slightly sunken and reddish brown under the skin and gradually develop into the surrounding and internal parts. When the soil is dry, the diseased part is hard and dry. In wet and sticky soils, it is easy to cause bacterial infection and soft rot. The diseased potato has a strange smell and cannot be eaten. During storage, diseased tubers can continue to develop, resulting in dry rot or wet rot. Commonly used agents: 25% WP, 65% zeocin WP, 50% amidipine WP, 40% EB aluminum wettable powder, 80% Mancozeb WP; 50 % triphenyl tin hydroxide suspension, 100 g/l cyclosulfuron suspension and the like. Control methods: The selection of disease-resistant, high-yield and good-quality varieties is the most economical and most effective way to prevent and treat late blight. Before planting, use multi-gene resistant varieties or horizontal disease-resistant seed potatoes; if disease-free seed potatoes are selected, disease-free seed potatoes should be carefully selected before and during the second year of storage; Species, once again strict elimination of diseased potatoes, and finally selected again when cutting, strict selection, to prevent diseased potatoes down; strengthen field management. Site preparation, selection of high-land-top, well-drained areas for planting, adoption of measures such as cultivating soil by cultivating the soil, removing tobacco roots, and draining trenches, increasing potash fertilizer, and improving disease resistance; selecting seed potatoes before planting and eliminating the fungus-containing yam, which can reduce The number of diseased plants in the field center. In the late growth period of potato growth, the chance of zoosporangium invading the potato can be reduced. In the epidemic year of disease, with appropriate early warning, harvesting after 2 weeks can avoid the chance of contact between the potato block and the diseased plant, and reduce the bacterial growth rate of the tuber. Camera Kits System With 4 Camera
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NVR has different product forms. Although its core function is the capture, storage, management and forwarding of network video streams, different companies have different designs to complete these functions and have their own characteristics. There are mainly three types of NVR products.
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The first is the PC server based NVR software product (Software Only), that is, the manufacturer provides the NVR software plus license mode, which can be installed on any standard PC or server that meets the requirements.
The second is the NVR overall solution of software and hardware integration provided by the manufacturer, that is, the manufacturer installs the NVR software on its customized PC server, which is the so-called Turnkey Solution product.
The third is embedded NVR products, namely embedded devices based on embedded hardware platforms and operating systems; In addition, there are storage management integrated devices developed by storage device manufacturers, which are not the mainstream NVR form.
In terms of stability, although the reliability of PC based NVR system is not as high as that of embedded NVR system, compared with PC based DVR system, the PC based NVR system has relatively simple functions, fewer failure links and better stability than PC based DVR system.
In terms of scalability, as the PC based NVR system is based on the general PC platform and the general operating system, its hardware interface is universal, open and standardized, which is easy to be compatible with other hardware, and software development is also relatively convenient. However, due to the high hardware integration, single interface, poor compatibility with other hardware, and weak incidental functions of embedded software, the secondary development of embedded NVR is relatively complicated.