Hawthorn Leafhopper

Tetranychus viennensis Zacher, Tetranychus viennensis. Alias ​​Hawthorn red spider, cherry red spider.
Harmful peach, apple, pear, hawthorn, cherry and so on.
Characteristics of damage: The sap of sucker buds, leaves, and fruit that grow into, if, and in young larvae, leaves a lot of chlorotic spots, and gradually enlarges the leaves. In severe cases, the whole leaf is pale and scorching, and it often causes secondary sprouting and flowering, which weakens the tree vigor. Not only did the fruit fail to mature, but it also affected the formation of flower buds and the output of the following year.
Morphological characteristics? Female adult nymphs have winter and summer types of points, winter type body length 0.4-0.6mm, red and shiny; summer type body length 0.5-0.7mm, purple or brown. There are 1 large dark spots on both sides of the back half of the body, and the feet are light yellow. The body is oval in shape, with a slightly wider front end and bulging. The back of the body is thin and slender, with 26 rows and 6 rows. The male body is 0.35-0.45mm long, spindle-shaped, the third pair is the widest at the base of the foot, and the tip is more pointed; the first pair is longer. Light yellow-green to pale orange-yellow, with dark green spots on both sides of the body.
Ovoid, pale yellowish to orange. Three pairs of young wormholes are round, yellowish-white, and ovoid, light green after feeding, with dark green spots on both sides of the body. If there are 4 pairs of feet, light green to pale orange yellow, with bristles on the back of the body, dark green markings on both sides, similar to the later.

Life history and habits? North of the year 5-13 generations, Liaoning 5-6 generations, Shanxi 6-7 generations, Henan 12-13 generations. All the fertilized females clustered over winter in various gaps in the trees and in the earth seams near the dry base. The average temperature of Qichun day is 9-10°C. When the peach buds expand and dew green, they cause damage to the buds. After the leaves are spread out, they are damaged by the leaves. In this case, the outbreak period is over 40 days. Feeding 7-8 days after the start of spawning, flowering period for the spawning period. The egg period of 8-10 days, 7-8 days after flowering, the basic hatching of eggs is completed, and the first generation of larvae emerged. The second generation of eggs reached the hatching period after more than 30 days after flowering. At this time, each worm state exists at the same time. . Before and after the wheat harvest is the peak period of the year. Severe people often have early defoliation. Due to the lack of nutrients in the food, the wintering females often appear in advance.
Cheng, Ruo and Yu are happy to be injured in the back of the colony. They have the habit of spewing and netting, and they can use the wire to spread with the wind. Eggs are produced on the screen. In the case of hermaphroditism or parthenogenetic reproduction, the hatching eggs are male and the field females account for 60%-85%. In the spring and autumn generations, an average of 70-80 eggs per female are produced, and 20-30 tablets are produced in summer. The lifespan of non-winter females is 20-30 days in spring and autumn and 7-8 days in summer.
There are dozens of natural enemies such as ladybugs, small flower bugs, insectivorous blind bugs, grasshoppers, thrips, hidden armor wings, and prey.

Control methods
1 Protect natural enemies. Minimize the use of insecticides or use agents that do not kill natural enemies to protect natural enemies. In particular, large numbers of natural enemies are put on a tree after flowering. If pesticides are not sprayed, pests can often be controlled below economic threshold levels. Individual trees are severe. On average, when each leaf reaches 5 heads, it should be “chosen” to avoid widespread killing of natural enemies.
2 The old tree scrapes during the dormant period. The main point is to scrape the old skin above the main branch and the main trunk can not be scraped to protect the natural enemies on the main trunk. Ye Xie mainly winters in the earth seams at the base of the trunk. It can be used as a photo shoot at the base of the trunk to prevent over-wintering.
3. Combination with other pests before germination can be sprayed with Baume 5 Baume Degree Stone Liquor or 45% Crystal Lithium Sulfur Mixture 20 times, 3-5% diesel oil emulsion, especially after scraping. .
4. Before flowering, it is the best time for pesticides to control foliar worms and many kinds of pests. On the basis of good pest monitoring and reporting, timely and comprehensive chemical control can be controlled before the breeding. 25% Bole Pa WP or 5% Bailing Suspension 1000-2000 times, 20% Tolke 2000 times, 15% Broom Net Emulsion 3000 times, 21% Crush Emulsion 2500-3000 Times of liquid, 573% of Celebrex emulsifiable concentrate 3000-4000 times, 25% of decyl ester (phenolphthalein ester) emulsifiable concentrate 1000-2000 times, 40% of Lok killing emulsifiable concentrate 2000 times liquid and other scavengers.
Pay attention to the rotation of the drug, can delay the emergence of resistance to leafhoppers.

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