Dear friends, everyone, the Century Pesticide Network Xiaobian has come to give you a general approach to the prevention and control of plant diseases and insect pests. Doing a good job in the prevention and control of pests and diseases is a very important part of the planting process and is of great significance for improving production. Let's take a look at it with Xiaobian!
The main small body insects in greenhouse vegetables include greenhouse tobacco mites (commonly known as whitefly mites), mites, sassafras and red spiders. Let's share the scientific prevention and control of greenhouse vegetable insects.
Greenhouse smoky (whitefly)
1. Occurrence and harm:
Bemisia tabaci (whitefly) is very harmful to crops. It is clustered on the back of the leaves. It sucks the plant juice with a sucking mouth device, making the leaves green and yellow, and even the whole plant is dead. In addition, B. tabaci (whitefly) also secretes a large amount of honeydew, causing coal pollution, affecting photosynthesis and reducing yield and quality.
2, prevention and treatment methods:
1 Biological control: release of the small bee, each plant released into 15 bees, once every two weeks, a total of three times.
2 physical control: yellow plate traps adult, 1 × 0.2m long strips, 32-34 per acre.
3 chemical control: the agent can be mixed with 25% chlorpyrifos 1000 times solution, 10% imidacloprid 1500 times solution, 0.6% matrine and lactone 2000 times solution mixed with imidacloprid and chlorpyrifos, and sprayed once every 5-7 days. Even spray 2-3 times, and treat tobacco powder.
aphid
1. Occurrence and harm:
There are three main types of greenhouse mites: melon, soybean meal, and peach aphid. 20-30 generations can occur in a year, the anniversary is endangered. The aphid clusters suck the plant juice on the back and tender stems of the leaves, causing the leaves to turn yellow, curl, and even die. In addition, aphids also transmit viral diseases, which is extremely harmful.
2, prevention and treatment methods:
1 Protected ground using a silver-gray insect net of 20-25 mesh and a wire diameter of 0.18 mm;
2 yellow plate trapping, artificial breeding of seven-spot ladybug, the initial stage of aphid release, 1500 heads per 667m2
3 agents can choose 0.2% matrine 500-1000 times solution, 3% acetamiprid 1500 times solution, 10% imidacloprid 2000 times solution, spray once every 3-5 days, even spray 2-3 times, or acres Use anti-smoke agent 350 grams.
Tea jaundice
1. Occurrence and harm:
The mites have small bodies and are difficult to see with the naked eye. Breeding quickly, can be propagated for 1 generation at 28-30 °C for 5 days, at 18-20 °C, 7-10 days for 1 generation, about 25 generations a year. Mainly in the greenhouse greenhouse breeding hazards. Aphids feed on the young leaves on the top of the plants. After the young leaves become old, they are transferred from the old leaves to the young leaves, also known as "the young leaves." After the leaves are damaged, the back of the leaves turns brown with oily light, twisted and deformed, and the top of the heavy ones are dry. After the flower and fruit are damaged, they do not bloom, they do not bear fruit, the skin becomes yellowish brown, the cork is corked and cracked.
2, prevention and treatment methods:
1 eggplant, pepper (sweet pepper) preferred 10% more bacteriocin 1500 times solution (banned on cucumber, cabbage); 1% matrine alcohol 600 times solution; 22% chlorpyrifos · imidacloprid (èµ›é”) 2500 times liquid spray; 1.8% avermectin 3000-4000 times solution. Spray once every 10 days and spray 3 times.
2 In addition, the front crops are cleared of fallen leaves in time, harvested in a concentrated manner, and sprayed in the whole shed to kill the insects.
Red spider
1. Occurrence and harm:
Red spiders in winter and spring greenhouse vegetables are mainly cinnabar leafhoppers and two-spotted spider mites, which can occur in 20 generations a year. The high temperature (developing temperature is 21-30 °C) is severe under dry conditions. The temperature exceeds 30 °C, and the humidity is greater than 70%. The old leaves are heavier when the nitrogen fertilizer is too much. The red spider sucks the juice on the back of the leaf with a sucking mouthpiece and forms a mesh. The damaged leaves are chlorotic, with small white spots and dry leaves. Generally, the lower leaves are harmed first and spread from the bottom to the top.
2, prevention and treatment methods:
1 promptly remove the lower old leaves and burn them out outside the shed;
2 Control the high temperature and high humidity in the shed, and timely watering to inhibit the spread;
3 agents can be used 25% acetylene thiophene, 50% dibutyl ether urea 2000 times solution, spray every 7-1 days for 2-3 times.
Greenhouse vegetable small body insects are therefore small in size and are easily overlooked. Planters will not notice until the hazard is serious. Therefore, it is necessary to do a good job of management, and do not provide a breeding ground for small insects.
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