Aphids are the most common pests of fruit trees. Of course, pears can't get rid of this "nightmare trouble". The common species of aphids are tumors, scutellaria, and cotton mites. Xiaobian summarizes the types of aphids and their Let me study it together. Types and harms of aphids 1, Yali tumor sputum: also known as the leaf locust, a wide distribution. The leaves and young shoots of the pears are seriously damaged. Yam sputum occurs earlier, usually only to damage local new shoots. The damaged leaves are wound from the sides to the back, sometimes rolled into a rope, the leaves shrink, the sputum is damaged in the leaf, and the leaves are not visible on the surface. Hey, the victim leaves gradually dry up. 2, Yali Huangqi: also known as Astragalus, Spiraea chinensis, Spiraea chinensis occurs later, the new shoots of the whole tree can be victimized, the damaged leaves are not obvious from the tip to the back or the horizontal roll A large number of worms can be seen on the outside. 3, pear pears: Mian 蚜 is also known as blood-colored mites. Distributed in Liaoning, Shandong, Yunnan and Tibet. For domestic quarantine objects. In addition to harming pears, it also harms red, sea bream, sand fruit and mountain stators. Mainly in the shearing slash, around the disease, the main trunk split crack, the petiole base and root damage. The victim was formed into a tumor, which was covered with a layer of white cotton. Second, the occurrence of aphid 1. Yali yellow worms and tumor mites: Both mites occur more than 10 generations a year, and the eggs are overwintered at the buds and buds. Overwintering eggs begin to hatch during the germination period. The newly hatched nymphs are concentrated on the green parts of the buds. The pears climbed to the leaflets after spreading the leaves. The aphids gradually matured and began parthenogenesis. The tree damaged by the stalk of Yali has appeared in the middle of May. Since then, there have been winged mites in the damaged leaves, and by the end of June, the winged owls began to move to other plants. After July, the Yali Garden is harmless without tumors, and the aphids breed on other plants over the summer. In October, winged crickets fly to the orchard, and they lay their eggs on the fruit trees. The tree damaged by Spiraea sinensis appeared in the late May, and the damage period was from June to July. At this time, the number of damaged parts increased significantly. There are winged mites in the scorpion group, which are spread and spread in the orchard. By the end of July, a large number of winged hawks were moved to the weeds, and they were propagated in the form of parthenogenesis. In October, they also produced winged crickets to fly to the orchard and lay their eggs. 2, Yali Mianlu: Mianlu is different in different places, in Dalian, Liaoning, 13 generations a year. The nymphs of 1 to 2 years old are overwintered at the branches of the branches, the edges of the wounds of the pests, the around the kerf, the lateral buds of the 1 year, the base of the roots, and the roots. When the leap year is spread, the wintering nymph begins to feed on the spot. In the Dalian area, the nymphs began to spread in early May, and they were transferred to the leaf mites to become dangerous. Adults breed in parthenogenesis and viviparous, while producing a small number of winged females that migrate to the surrounding trees. June is the full-year breeding hazard. At this time, many white cottons are seen on the scars, branches, roots and other places of the trunk, and the lower part is aphids. The temperature rises from July to August, which is not conducive to the reproduction of aphids. At this time, there are a large number of natural enemies, mainly parasitic natural enemies, daylight bees and predatory natural enemies, which reduce the density of insect populations. After mid-September, the temperature dropped, and it was suitable for the breeding of the pears and the second hazard peak. When the temperature dropped below 7 degrees in November, the nymphs continued to enter the winter. Third, the prevention and treatment of Yali aphids 1, Yali jaundice, tumor prevention and treatment methods: 1 biological control. In summer, there are many natural enemies of locusts, mainly ladybugs, grasshoppers and scorpion flies. Among them, ladybugs are the main predator group. Most of the ladybugs in the wheat field after wheat harvest are transferred to the orchard to inhibit the occurrence of aphids. Medicine to protect natural enemies. 2 chemical control. Focus on the prevention and control of the wintering eggs of aphids. The wintering parts of the eggs of the two aphids are similar to the hatching period. When the nymphs are sprayed, the two aphids can be treated simultaneously. During the spraying period, the pears sprouted to the leaf stage. Commonly used agents are 50% anti-Converse wettable powder 800-1000 times liquid, 10% imidacloprid wet powder 5000 times liquid. If the quality of the spray is good, the spray can be used to control the harm of the pear. For Spiraea japonica, according to its occurrence in the growth period of fruit trees, the number of spraying should be increased appropriately, but the number of times of spraying should not be too much, so as not to kill the natural enemies too much. 3 Use the sticky board to kill: It is temperate to yellow-green, and it is killed by yellow sticky board. 2, Yali Mian蚜 prevention and treatment methods: 1 Strengthen quarantine: Yali is the quarantine object, and the long-distance transmission of this worm mainly depends on seedlings and scions. It is forbidden to transfer seedlings and scions from the area where the cotton mites occur. If it is found that the transplanted seedlings or scion have sputum, soak it in 2,000 minutes with 48% lesbian emulsifiable concentrate for 2-3 minutes. 2 Clear the wintering insect source: When scraping the bark in early spring, completely remove the diseased mites and the wintering locusts around the kerf, and brush with 48% of the 50% solution to eliminate the remaining mites. The scraped warp and the like are collectively burned off. 3 Spraying on the tree: If the spread period of the cockroach and the increase of the density of the insect worms in the field are the spraying period. Commonly used agents are 48% lesbian emulsifiable concentrate 1500 times solution, 40% chlorpyrifos emulsifiable concentrate 1000 times solution. After harvesting the pear, the tree is sprayed with 40% sputum emulsifiable concentrate 1500 times, which has a long-term effect. The above is the control method of Yali aphids. To learn more about pesticides, please pay attention to the Chinese pesticide network.
A Tape Measure or Measuring Tape is a flexible Ruler and used to measure distance.
It consists of a ribbon of cloth, plastic, fibre glass, or metal strip with linear-measurement markings. It is a common measuring tool. Its design allows for a measure of great length to be easily carried in pocket or toolkit and permits one to measure around curves or corners. Today it is ubiquitous, even appearing in miniature form as a novelty item sb use tape measures in lengths of over100m.
There are two basic types of tape measures with cases, spring return pocket tape measures and long tape measures. Spring return pocket tape measures will generally fit in a pocket. They are small, the case is up to about three inches across. The tape is returned to the case by a spring mechanism. Pocket tape measures have a tape one foot to fifteen feet in length and ¼ to ¾ inches across. When most people think of a tape measure, they are thinking of the pocket tape measure.A second tape measure design is what is called the long tape. These are cased tape measures with tapes of 25, 50, 75, 100, 200, 300, and even 500 feet in length, designed for engineers and builders. Because surveying was usually done in rods, surveyors use long tapes of 33 feet (2 rods), and 66 feet (4 rods). Surveyors also used 49½ feet of a 50-foot tape for 3 rods and 99 feet of a 100-foot tape measure for 6 rods. Long tapes instead of being returned by a spring, were usually returned by hand crank.
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