In recent years, greenhouse leek disease has spread, which poses a great threat to winter leeks and should be promptly controlled. At the early stage of the disease, some yellow tips with tip size appeared on the tip of the leaf. With the development of the disease, the lesions were connected and the leaves were dry and dead when severe. Its main control measures are: 1. Small water irrigation. Because the leek disease is transmitted by the current, such as flooding, it is very easy to cause the humidity in the greenhouse to increase, so that the epidemic spreads. Therefore, small water should be poured. In addition, pay attention to the application of phosphorus and potassium fertilizers when fertilizing, too much nitrogen fertilizer will cause the occurrence and expansion of the disease. 2. In time ventilation. Pay attention to ventilation after watering to reduce the humidity in the greenhouse. Ventilation is selected at noon on a sunny day with no wind. General ventilation time should not be too long, 1-2 hours is appropriate. When the area of ​​the shed is too large, multiple ventilation methods can be adopted. However, the ventilation openings should not be too large, which is easy to cause excessive ventilation. Leek hair. 3. Remove dead leaves. The dead leaves that remain in the soil are the root cause of the leek outbreak. They should be picked up in time and be ventilated to reduce the indoor bacteria source. 4. Drug control. Can use 50% carbendazim WP 500-800 times or 40% EB aluminum wettable powder 400-600 times spray control, spray once every 7-10 days, even spray 3 times.
Insect pheromones are compounds used by insects to represent various information such as aggregation, foraging, mating, and alerting. They are the chemical molecular language of insect communication. At present, the basic control measures for pests in agricultural production mainly rely on chemical pesticides, but the long-term uncontrolled use of chemical pesticides has brought many side effects. The first is the emergence of pest resistance, which causes the use of drugs and drug concentrations to increase, the cost increases year by year, and the prevention and control of increasingly difficult; the second is to disrupt the ecological balance, while controlling a large number of natural enemies were killed, causing the pupae of secondary pests; Third, it pollutes the environment. A large amount of pesticides remain in crops, soils, rivers, lakes, and seas, and they are enriched in the human body through the form of food chain, causing another harm to humanity. Therefore, relevant research departments in many countries are currently working hard to explore and study new approaches and technologies for pest control. These studies include: the development of new, efficient, environmentally friendly, low-toxic, low-residue chemical pesticides; natural enemy insects and microorganisms The use of pesticides; insect sterilization technology and the application of insect hormones; among them, the research on the use of insect hormones, especially insect sex pheromones for pest control, is receiving increasing attention and attention.
Research on insect pheromone has been developing rapidly. Since the first insect pheromone Bombykol, has been isolated and identified, more than 2,000 insect pheromones and their analogs have been identified and synthesized worldwide, of which more than 100 insect pheromone To achieve commercial production, the production and research of Lepidoptera sex pheromones is the most extensive and comprehensive.
Insect communication, Including Sex pheromone, Collection pheromone,Alert pheromone, Tracking pheromone Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com
Anti-greenhouse leek disease
Pheromone is a collective name for compounds that play a role in chemical communication between organisms, and which is the chemical molecular language of insect communication. Including sex pheromone, collection pheromone, alert pheromone, tracking pheromone, altruin, altruin, synergistic pheromone, evacuation pheromone. Pheromones are chemical substances that interact with each other and can affect each other's behavior, habits, and even development and physiological activities. Pheromone is produced by the glands in the body and is directly discharged to the outside. The pheromone is transmitted to other individuals by means of air, water and other conductive media. Pheromones are found in lower animals and higher mammals. Because the pheromone is transmitted by the external environment, it is also called pheromone. Chemical substances that interact between different species are called interspecies pheromones or heteropheres.