The bearing structure, fixed film systems and installation of this greenhouse is relatively simple. And due to it, raw material and manufacturing costs are affordable. Except the high strength woven film is higher, other kinds of antidrop film are economical. In general, the comprehensive cost of film greenhouse is lower 30% ~ 50% than the same size and specifications of the other types of greenhouse. Single Span Greenhouse,Greenhouse Film,Tunnel Greenhouse,Plastic Film Greenhouse JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , http://www.spgreenhouse.com
Asparagus pest control
The main diseases are: 1 Brown spot disease occurs in the late July to mid-September when the temperature is particularly high. On the surface of the stem of the diseased plant, many brown and narrow lesions are formed on the stem surface, and the leaves turn yellow, followed by defoliation, which hinders the growth and development of the entire plant. Control method is to spray Bordeaux mixture, or spray treatment with Zeisin Zinc, the use of Captiva Dan wettable powder 800 times spray effect is also good. 2 Stem Blight Disease The stem of this disease is not harmful to the leaves, and the most susceptible part is the surface of the stem at a height of about 30 cm from the surface. At the beginning, young stalks appear as tiny spots of milky white and then expand into a spindle-shaped dark red spot, which is prone to occur when the spot is full of stems around the stem. Control methods: Drain the planting site and provide good ventilation. Pay attention to late fertilization and apply more organic fertilizer. When planting, pick out the diseased plants and do not plant the trees too deep. Use 0.3%-0.4% Bordeaux mixture or 50% Tuzet 500-800 times solution, or 50% thiophanate wettable powder to add water 1000 times, spray once every 7-10 days, 2-3 times can be cured. 3 root rot This disease is caused by a variety of pathogens. The bacteria attacked the root of the asparagus, and when the root rotted, the bacteria caused the internal corrosion of the root and left the root of the underlying epidermis, causing the plant to die. There is no special treatment for this disease at present, and it can only be observed on the cultivation. Once a diseased plant is found, the root excavated soil will be burned immediately. At the same time, fully sterilize the mercury in the soil near the affected plant, and do not plant asparagus in the fields where mulberries, fruit trees, and potatoes are grown. 4 Rhizoctonia The pathogenic bacteria of this disease are from the soil and occur on Miaoyou or power plants. Plants are weak and susceptible to disease. If harvested, the root is cut by a knife, and it is easily invaded by bacteria. The diseased plants turned red-purple from the top of the surface, and the entire plant died. The control method is the same as that of root rot. 5 Rust This disease can easily occur in cold areas. The rust-colored lesions appear on the surface of stems and leaves of plants after disease, and the leaves fall off early. In severe cases, the whole plant will discolor and die. Control methods: The asparagus land should be well ventilated and drained, and the rust-resistant varieties should be selected. The diseased plants should be burned, and the chlorothalonil solution solvent and the antagonistic dan aqueous solution should be sprayed. Insect pests mainly include Spodoptera litura, golden needles, and aphids, and underground pests include tigers, badgers, and crickets. 1 Spodoptera litura: After the larvae colonize the foraging branches, they gradually dissipate and gradually eat up the leaves of the plants, seriously affecting photosynthesis. The control method is: using 8% dichlorvos 2000 times solution or 90% trichlorfon 1500 times solution, spraying once every 10 days, several times in succession. 2 Golden needleworm: its larvae in the soil foraging seedlings and drilled into the stem and underground stem hazards, the adult lurking in the surface of the soil during the day, the mating habit of mating at night. Control methods: In the spring and fall season, when the adult activity is most prosperous, 50% of dichlorvos or 500 grams of trichlorfon and 25-30 kilograms of fine soil can be sprinkled on the ground or into the soil surface. 3 Asparagus beetles: The adults and larvae of this insect pest both eat asparagus and harm young shoots in spring and harm stems and leaves in summer. During the winter, the adult is hidden under the dry stem of the asparagus or under the weeds, and is harmed the following year. This insect has the greatest impact on the yield. Control methods: At the time of harvesting, the stems and leaves of the whole plant were harvested, and the growing seedlings were sprayed with 0.75-1% rotenone powder and calcium arsenate powder was sprayed in summer.