Shaanxi apple seedling apple seedlings wholesale

Shaanxi apple seedling apple seedlings wholesale, apple seedlings, dwarf apple seedlings, Joe of apple seedlings, seedling apple, apple trees, apple seedlings, seedling apple, apple tree seedling, mainly to: Shaanxi, Gansu, Ningxia, Xinjiang, Tibet, Liaoning, Hebei, Jilin, Inner Mongolia, Shandong, Shanxi, Henan, Tianjin, Beijing, Yunnan, Guizhou, Chongqing, Sichuan and other places. Begonia seedling rootstock seed, sieversii seed, seed Ding Shan, catalpa seed seeds. Apple seedlings: the length of Fuji, Gala series, Qin Guan, Red Star Huaniu series, Hanfu, Fuji Wang Yuhua early rich, red cap dew, honey crisp, Li Fu, Golden Century, Early Red Gala, the United States eight, Fujiki, Red General, Autumn Wang, 2001 Fuji, early Hongxia, pink lady, Corolla, Chen Yang, Qin Yang, Xia Hong, Jin Matsumoto, columnar apples. (Australia Lemna minor), Ruilin, red science, Oldenburg, Gross, acid and Wang. Fourth, a viral disease hazard Apple, Apple in the long process of vegetative propagation, virus infection every year accumulated increase. Once the tree is a virus infection, it is infected for life, lasting harm. Second, Apple virus is mainly transmitted by grafting, along scion (or rootstocks), seedlings over long distances. Thus, the greater the number of Grafting, the faster the transmission speed of the virus. Third, viral diseases and fungal or bacterial disease is different, it is difficult to effectively prevent or control the use of chemicals, nurture and cultivation of virus-free seedlings is the fundamental way Apple virus disease control. Fourth, the fruit affected by virus infection, the virus is mainly parasitic and multiply in the cells. Therefore, all body parts are with the virus, destroy, disturb the normal physiological function of the tree, leading to growing loss, decline, quality deterioration, until the whole plant death. Apple virus harm their characteristics, can be divided into non-latent virus and latent virus in two categories. Non-Apple apple latent virus infection, most cultivars have obvious symptoms, easy to identify diseased trees, no special identification, based only on symptom characteristics, you can identify. For example, apple and apple-green mosaic disease occurred in China wrinkled skin disease is caused by a non-latent disease. The latent virus in the cultivars do not show obvious symptoms, it must be identified in order to clear the poison apple situation. National research shows that most apple cultivars, were infected with one kind until several latent virus, which Apple back leaf spot virus, apple stem pitting virus and apple stem grooving virus most widely distributed, the greatest danger in almost all cultivated apple The country has a presence. Actual production, the wide distribution of the virus Apple hazards of weight, as much as bark rot caused by fungi and fruit rot. The main varieties of apple cultivated throughout almost all latent chlorotic leaf spot, stem pitting virus and stem groove 3. These types of the virus, in the case of non-disease-resistant rootstock, will form a recession grafting seedling disease or other acute hazards not survive, as long as the change resistant rootstocks can basically solve the problem on prevention. But to solve the chronic hazards latent virus, we must start from the rootstock and scion two ways. Apple has been reported in more than 30 kinds of viruses, worms pass the virus has not been found, but also shows mass poisoning found in other media. Apple viral disease is currently no effective treatment, therefore, foster mother tree scion virus-free use, propagation and cultivation of virus-free seedlings, it is a fundamental measure against apple virus hazards. Fifth, Apple virus-free seedling cultivation superiority based on years of successful experience abroad, I field from 1991 was approved by the Ministry of Agriculture Experimental research and user practices in northern China's only state-level virus-free seedling breeding and cultivation test base since proof superiority (virus-free apple seedlings) virus-free seedling apple cultivation following main points: 1, virus-free seedling growth robust early results. Under the same management conditions, virus-free seedling growth robust, high growth of 10% -28% over the infected nursery stock, dry stem diameter of growth of 12% -20%, while the neat line, root, root absorption function is strong, leaves hypertrophy Bright. Planting high survival rate, compared with 16% of infected height. 2, virus-free trees grow strong and stable yield. No virus infected tree tree than general increase 16.9% to 60%, no size, small in magnitude result, Shushi strong, vigorous growth, total weight increase tree than 36 percent of infected trees, trunk girth 26% increase - 30%. 3, good virus-free fruit tree big quality. Virus-free fruit of the tree are large and uniform color is good, smooth finish. 4, virus-free trees need less fertilizer, strong resistance. Virus-free apple trees need fertilizer significantly reduced the amount of nitrogen in particular, no virus infected tree tree than by 40% -60%, resistance to extensive management, suitable for cultivation on infertile soils. Some of the world's developed countries have already achieved virus-free apple cultivation, and China in recent years has only just begun to develop virus-free apple cultivation, it is now and for the overall development trend of China's fruit production is to improve fruit yield and quality the only way.