The small green leafhopper of the false eye, commonly known as floating dust, is one of the main pests on tea plants. Due to its harm, light shoots were damaged, production was reduced, and heavy shoots were destroyed, resulting in loss of income.
First, the morphological characteristics
The false eye is a small green leafhopper of the genus Homoptera, leafhopper family. Life through eggs → nymphs → adult three stages.
1, egg crescent, about 0.8 mm long, about 0.15 mm wide, initially milky, gradually light green, seeing a pair of red eyes before the hatching front.
2, 5 instar nymphs. At the beginning, it was milky white. With the increase of worms' age, the yellowish greenness gradually changed. At the third instar, the wing buds began to appear. At the fifth instar, the wing buds reached the fifth abdominal segment.
3, adult head to wing tip 3.1-3.8 mm, light green to yellowish green. The middle crown of the crown mostly has two green spots. There is a pair of green circles on the leading edge of the head. It is also called pseudo monocular and the compound eye is gray-brown. Small shield plate in the middle of the chest with white stripes, horizontal straight. The forewings are yellowish green, green at the leading edge, and translucent or slightly brownish at the tip. Foot and body are the same color, but the ends of the foot and the segments of the foot are green.
Second, the way of harm
With nymphs and adults sucking shoots and sap from young shoots, female adults lay eggs within the shoots, resulting in damage to the transduced tissue, loss of nutrients, and insufficient water supply. After the victim's damage, the leaf withered, the veins turned red, and the leaf edge reddened to dry coke. The internode shortened and the texture became brittle, especially in the second round of the year.
Third, the characteristics of occurrence
The green leafy green leaf bed tends to be tender, only harming shoots and shoots, fear of light and fear of wetness. It is less active when the morning frost is not yet dry, and the sun gradually shifts to the canopy, and its adult is gradually fertilized. The egg is produced daily, producing 1-2 grains per day, so it is determined that its occurrence algebra is not neat, and it boils down to the following characteristics in its occurrence.
1, annual generation of algebra occurs in Guangdong more than 13 generations per year, in northeastern Guangdong adults overwintering, no obvious winter phenomenon in other places.
2. Adults and nymphs can be seen at the same time in overlapping tea gardens from generation to generation. However, there are two peak seasons in the year, the first peak period is from May to June, and the second peak period is from September to October.
3. The climatic factors affecting temperature, precipitation and number of rain days are the main climatic factors that affect the growth and decline of the larvae. It is suitable to take place at an average temperature of 17-28°C when it is sunny.
4, there are many natural enemies more than 60 kinds, the most important egg parasitoids, dragonfly wasps, spiders and insects and so on.
In addition, its occurrence and development are closely related to cultivation and management and varieties. White leaf single bush victim.
Fourth, control methods
There are two different directions for the prevention and treatment of false eyelid leafhoppers. One is to use ecological regulation methods and the other is to control chemical pesticides.
1. Ecological control The so-called ecological control is the use of agricultural cultivation and management measures, such as pruning, picking, etc., to fully protect natural enemies, play the role of natural enemies, and control the occurrence of small green leafhoppers. For example, the Gull Farm and Warriors Farm in Leizhou Peninsula in our province are By adopting an ecologically controlled approach, pesticides are not used in more than 7,000 acres of tea gardens. For more than a decade, small green leaf grasshoppers have been controlled at levels that do not cause economic losses. The damage rate of buds is low, the density of insect population is low, spider species are numerous, and the number of spiders is high. The parasitism rate of dragonfly was high, and it completely controlled the small green leafhopper. This method is easy, effective, and cost-effective, and will not cause tea pesticide residue contamination. Using the method of ecological regulation, there will be certain risks in the initial stage of implementation, that is, the population of insects will rise at a certain level during the beginning of pesticide application. However, there is no need to fear. When the number of natural enemies like parasitoids and spiders rises, they can play a controlling role.
2. Control methods for chemical pesticides to control chemical pesticides. This is a commonly used method in tea gardens in our province. The effect is certain, but there are also more serious drawbacks. After the use of drugs killed the natural enemies. According to our investigation, any tea garden that has used pesticides will find it difficult to find the bees and spiders. The number of spiders will also rapidly decline, and the role of natural enemies will be difficult to exert. The small green leafhoppers are not neat, and the eggs are produced in the tender shoots. Playing a drug often does not solve the problem, and it is necessary to fight drugs frequently. This causes a vicious cycle, and the more you fight medicine, the more you rely on drugs. For example, in some tea plants in our province, once a tea is harvested, it is given a drug. Many drugs are required each year. Many insects still occur. The cost increases, and pesticide residues also increase. We believe that all localities should overcome the idea of ​​blindly relying on chemical pesticides and use as few pesticides as possible. Even if pesticides are to be used, they must be selected as appropriate pesticides to achieve the right medicine to reduce pesticide residues and reduce costs.
At present, Uranus, Kung Fu, Endosulfan, Bataan, and Imidacloprid are the most desirable pesticides for the control of F. glauca. The specific usage is as follows: 10% of imidacloprid 15-20g diluted into 4000-5000 times dilution, 35% of endosulfan 50-75ml diluted to 1000 times, 98% of Batam 40-50g diluted to 1000-2000 times, 2.5 % Uranus uses 25-40 milliliters of water per acre to dilute to 1500-2000 times, 2.5% kung fu uses 25-35 milliliters per acre, add water to dilute into 2000 times liquid spray. Each of the above medicines may be used as an alternative, and may be administered before the peak of the nymph of the false eyelid.
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