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How to Identify and Prevent Tea Planters
A ruler, commonly known as a worm, is a Lepidoptera insect. There are many types of cutworms in tea gardens in our province. The main species are the linden oysters, silver oystercatchers, gray ulmoides, and oil tea pods. Among them, the size of tung oil trees occurs most frequently. In the 1970s and 1980s, Lianping and Yingde were successively Some large tea farms in Yangjiang, Jiaoling and other places have caused disasters and have consumed many tea trees. The quercus ulmoides is also known as the big scaleworm. It is the largest species in the size of the tea plantation. It is larvae, eaten in large quantities, and has many hosts. When it is serious, it will eat all the leaves of the tea plantation to form a polished rod. The adult insects are silver-gray, body length 20-25 mm, wings 50-70 mm, black spots on the wing surface, 3 distinct yellow-brown ripples on the front wings, 2 ripples on the hind wings, and abdomen hypertrophy of the female moth. At the end there is a bundle of yellow fluff. The color of the larvae varies greatly and varies with habitat. The larvae grow up to 70 millimeters long and the head is depressed in the center. There are a pair of protrusions on the back of the 4th and 5th sections of the abdomen of the abdomen. . Egg oval, 0.7-0.8 mm long, fresh green at the time of birth, later light green, covered with yellow villi. The giant oystercatchers occur in Guangdong for three to four generations each year. They live in winter in the soil near the victim tea tree. In the following year, adults emerged in April. The first generation in Guangdong Province occurred more neatly and suffered more. The adults of this insect prefer to inhabit the tall trees near the tea plantation or poles or places below 1 foot of the building. The larvae began to increase their food intake from the fourth instar, with protective coloration and mimicry. The natural enemies of the giant salamander are black egg bees, velvet bees, and nuclear polyhedrosis viruses. Among them, nuclear polyhedrosis virus has the greatest impact on its population development. The following methods can be adopted to prevent and control large scales: 1. Biological control. With polyhedral virus preparations or Bacillus thuringiensis hd-1 preparations, both products are commercially available. Virus polyhedrons can also be obtained through their own collection. Infested corpses are harvested in the field. The corpses are crushed with water and the larvae are fed with their sap for expansion. The diseased larvae are then ground and mixed in a certain amount. The water sprayed on the tea tree and the larvae died after they died. According to the trial, there are 6-8 dead animals per mu. In the tea gardens, once the virus disease epidemic occurs in the Greater Taiga, it will be difficult to see the larvae again in the next seven or eight years. 2. Capture adults. Emphasis was placed on the occurrence of overwintering adults in April and early morning capture. 3, eliminating insects. Can be combined with tillage, fertilization, etc., with a small tine to collect or deep-buried soil. In the early 80s, the hot spring tea farm received 150 pounds of this insect in 3 acres of land. 4, spraying control. This insect is very resistant to common pesticides, but pyrethroid pesticides have special effects. Such as 10% Uranus 6000-8000 times fluid, 20% cypermethrin 5000 times fluid, 10% insect repellent or 10% efficient eradication of 100 times 5000 times liquid. However, these drugs should not be used more than once, once a year on the line.