Comprehensive Prevention and Control Techniques of Sweet Potato Stem Nematodiasis

Sweet potato stem nematode disease is commonly known as "heart disease" and "vacuum disease." It is a dangerous and devastating disease. The main infestation of seedlings and vines harms the tubers, resulting in poor growth, short and deformed stems and roots. Severe plots of plants yellowed, withered, and rotted pieces of melons, resulting in severe reductions in yield. 1. Occurrence of hazards Pingyin County has a large area of ​​dry land in the mountains, suitable for planting sweet potatoes, perennial planting area of ​​10,000 to 12,000 hectares, accounting for 1/3 of the county's planting area of ​​food crops. Due to years of planting, plus the adjustment of potato seedlings, the development of starch processing industry and other factors, making the disease spread in our county. By the end of 1994, the entire county was widespread. The land mass damaged by stem nematodes generally reduced production by 1 to 20%, and over 80% of them were serious. This seriously threatened the production of sweet potato in our county. Therefore, we conducted a control experiment and found a set of Integrated prevention and control technology has a very significant effect. 2. Route of transmission The disease is mainly transmitted by seedlings, seed potatoes, soil, and fertilizers. Sick nursery seedlings and tubers and seedlings with stem nematode disease are the main ways of long-distance transmission. 3. Control measures 3.1 Strengthen quarantine. It is not necessary to adjust potatoes and buy seedlings from the epidemic areas where sweetpotato nematodiasis occurs, and strict inspection and quarantine of the transferred potato seedlings. 3.2 Establish a disease-free location. For disease-free plots that have not been planted with sweet potatoes for many years, healthy disease-free seedlings have been planted, and disease-free seed potatoes have been established for the retention of field crops, the propagation of starch-based virus-free XUHU 18 and the fresh-food type of virus-free Beijing 553. 3.3 selection of disease-resistant varieties. There is a large difference in the resistance to stem nematode among the varieties, and Jishu 10 and Lushu 3 should be cultivated for the disease-resistant plots. 3.4 1 Chemical treatment seedbed, on the basis of the selection of disease-free seed potatoes, seedlings soaked with warm water at 50 ~ 55 °C for 10 minutes, can kill nematodes 7 mm deep below the seed coat epidermis. The seedlings were applied twice at the nursery stage. When the seedlings were topped for the first time, the second time after the second seedlings were sown, 5% of Aldicarb Granules were used, and 40 to 50 g/m2 of fine soil mixed. After the homogenization, evenly spread to the seedbed, then spray water or pour with 40% methylisophos- phate 400 times. As there are many stem nematodes at the base of the seedlings, high-cutting seedlings can be used when planting seedlings, and then the seedlings are soaked in the base for 30 minutes with 40% methylisoprenophosphate 200 times. 2 Datian chemical control. In order to prevent stem nematodes in the soil from attacking disease-free seedlings, they must also be applied with aldicarb in order to prevent and control them, and 1 to 2 kg per 667 square meters. That is, according to the planting density, grits, transplanting, watering, spraying, covering soil, or 667 square meters with 40% of methyl isoflurophosphate 0.5 to 1 kg water points, to achieve the purpose of disease prevention. 3.5 Change crops to prevent soil from spreading. In the severely affected land, crops such as wheat, millet, and cotton can be combined with agricultural industrial structure adjustments, and crop rotations of 3 to 4 years can effectively reduce field insects. 3.6 timely harvest, safe storage. Daejeon should receive early harvest in due course to mitigate the damage. To stay in the field before the frost, choose sunny harvest, choose disease-free, no injury seed potatoes, into the cellar storage on the same day. 3.7 clean the pastoral. After the harvest of sweet potatoes, the diseased roots in the fields were immediately excavated, the sick bodies were completely removed, and the debris was destroyed and disposed to reduce the source of insects. Remember to discard or use fertilizers as you like, and do not use soil washers.

Standardized Herbal Extract

A standardized herbal extract is an herb extract that has one or more components present in a specific, guaranteed amount, usually expressed as a percentage. The intention behind the standardization of herbs is to guarantee that the consumer is getting a product in which the chemistry is consistent from batch to batch. This practice has developed out of the drug model of herbal medicine, in which modern scientists have attempted to identify the components of a plant that have definite pharmacological activity in the body. Unfortunately, while scientists can isolate many constituents from an herb and discover how particular chemicals may act in the body, they inadvertently remove or overlook components that may contribute to the activity of the whole herb. Consequently, standardization may concentrate one constituent at the expense of other potentially important ones, while changing the natural balance of the herb`s components.

Standardized Herbal Extract

Standardized Herbal Extract,Green Tea Extract,Black Currant Extract,Cranberry Extract, Green Coffee Bean Extract

Excellent Health Products Co.,Ltd. , http://www.sino-excellent.com