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!
Aphids, including cotton aphids and meadows, and cotton aphid have strong fertility. In summer, they can be completed in 4 to 5 days, and 20 to 30 generations per year. Spiraea can be used for 18 generations per year.
1 The Cheng and Ruoyi clusters directly suck the leaves and fruits of the plants, forming the lack of plant nutrients, arranging growth retardation or delay, and early aging, resulting in poor fruit quality and low production value.
2 Aphid saliva contains certain amino acids and plant growth hormones, causing mottle, stretch, insects, tumors, etc. in the leaves of plants, providing a favorable growth environment for aphids, while reducing the effective leaf area of ​​plants and reducing photosynthesis.
3 Aphids spread a variety of viruses during the feeding of hedgehogs, especially the citrus scorpion virus, which is known as the "fruit tree cancer", in which the citrus is the most vegetative.
4 Aphids excrete honeydew, breed fungi, form soot on leaves and fruits, affect plant respiration and photosynthesis, and honeydew easily attracts ants, hindering and even dismissing pollinators and aphids.
Spiraea sinensis: It is more like the new shoots that have just been extracted. The flocks are fed to form a group of damaged young shoots, which are not curled up and become useless.
Tangerine: The eccentric leaves have been stretched open, slightly aging some new shoots, they are closely arranged on the new shoot stems and veins to feed, and sometimes covered with the entire new shoots and leaf back, the damaged shoots, leaves twisted and deformed.
Cotton aphid: In the early stage, it was damaged by the host's buds, new shoots and young leaves. In the later stage, it was also a diseased and near-old leaf. The damaged part grew slowly and the leaves were yellow, but the leaves were not formed, and no obvious stretch was observed.
Therefore, citrus aphids are one of the important pests in the prevention and control of fruit trees. The main control points are as follows:
1. Pay attention to the winter clearing garden, remove the weeds in the garden and scatter the lime powder to cover the tree tray with weeds; cut the tree crown for winter shearing (before and after the cold), cut off the diseased branches, weak branches, hidden branches, and add the ventilation of the canopy. And the cut branches will be burned or buried.
2. In the aphids and episodes, the use of aphids has a yellowish habit, and a 50 × 80 cm yellow lacquered cardboard coated with tung oil is placed between the rows of plants to catch many winged aphids.
3. Maintain natural enemies of mites, such as worms, cockroaches, and grass mites. Therefore, be careful not to use insecticides such as aster, so as not to damage the natural enemies of mites. Before and after flowering, the drugs for prevention and treatment can be selected: 1.8% avermectin 3500 times solution, or 3% acetamiprid emulsifiable concentrate 3000 times solution, or 480 grams / liter chlorpyrifos EC 1000 times solution, replacement medication.
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