With the increase of temperature, there have been many problems in vegetable production in greenhouses, and pest control work needs to be further strengthened.
First, the prevention of infestation diseases (a) The current vegetable fungal diseases mainly tomato leaf mold, early blight, gray mold and so on. It is necessary to strengthen the ventilation and dehumidification within the greenhouse, and spray them with quick-acting, thiophanate-methyl, and Fuxing agents. The agents can be used interchangeably according to different diseases. (2) Bacterial diseases of vegetables occur more severely under high temperature and high humidity, such as bacterial ulcer disease of tomato, bacterial soft rot of melon, and bacterial angular spot of melon vegetables. Can spray streptomycin or thiazolyl and other agents, can also be sprayed DuPont spring process, can be killed, copper noble and other agents. (c) Severe viral diseases occur under high temperature and drought conditions. First of all, we should control insect pests, followed by spraying foliar fertilizers and plant conditioners (harvest No. 1), and thirdly, we must spray virus agents such as New World Health, virus A, virus venom, and bacteria and gram poison grams. In addition, spray more water to prevent viral diseases.
Second, the prevention of physiological diseases Most of the current vegetables due to the growth of high temperature and light and other causes of premature aging (tomato varieties such as pink fruit in the lower yellow leaves, mainly between veins yellow, veins are still green). Most vegetables will appear wilting after watering or fertilizing. Solution: Remove the old leaves, while spraying green Bo Lai calcium magnesium foliar fertilizer or harvest No. 1 and so on.
Third, the increase in insect-resistant temperatures provided the conditions for the occurrence of insect pests. Current insect pests mainly include whitefly, aphids, thrips, spotted lilies, and cockroaches. Insects such as Pieris rapae, Plutella xylostella, Helicoverpa armigera, and H. assulta have just started activities. As the ground temperature rises, underground pests such as nematodes and cockroaches will also be aggravated. Solution: You can spray once again the net, imidacloprid, acetamiprid, Wan Ling, avermectin, scorpion is dead, azadirachtin and other agents for prevention, can also be used avermectin agents or azadirachtin or phoxim And Le Schuben etc. irrigated or flushed with water.
Fourth, anti-high temperature Vegetables currently due to high temperature and light caused by more diseases, such as pepper and eggplant sunburn disease. Solution: (1) Cooling can be achieved by covering the shade net, spraying cooling agents onto the film or spraying mud on the film of the greenhouse, or throwing ink. (2) Spraying fresh water can properly supplement the water needed for vegetable growth and reduce the symptoms of wilting in vegetables.
V. Fertilizer and water management At this stage, some vegetable farmers rush to apply high-nitrogen fertilizers based on ammonium bicarbonate and urea, while others apply fresh feces to greenhouses. Although these fertilizers have a certain fertilizer effect, high-nitrogen fertilizers tend to cause soil compaction or smearing of leaves, and flushing with fresh manure can cause a large number of earthworms to appear in the soil. These conditions will affect the normal growth of vegetables. Solution: Comprehensive application of various organic and inorganic fertilizers and mastering balanced fertilization.
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