In recent years, the leaf miner seriously threatened the growth of the lawn. When we were resting on the lawn, we saw that the lawn was covered with small grass and yellow, which was not beautiful at all. How to raise and control the leaf miner?

The larvae sneaked into the epidermis of the host leaf, twisted and passed through, and fed green tissue, resulting in an irregular gray-white linear tunnel. When the hazard is serious, the leaf tissue is almost completely damaged, and the leaves are covered with ramps, especially the leaves at the base of the plant are the most seriously damaged, even withered. Larvae can also be used to eat tender pods and pedicels. Adults can also suck on plant juices to make them suck into small white spots. When the multi-headed larvae sneak a leaf, it is easy to make the leaves wither.

The leaf miner occurs several generations a year, and the generation overlap is serious, and the generations in the greenhouse are more chaotic. The leaf miner usually begins in the middle and late April, and the period from May to October is severe. The main factors affecting its occurrence are temperature, humidity and foodstuffs. The developmental stage of the leaf miner larvae is generally 3 to 8 days, the age of the insects is 3 years old, and it takes 14 days to complete the first generation at 20 °C. Adults are active during the day, and they begin to lay eggs at 1 to 2 days after emergence.

Control method

1. Quarantine control The leaf miner has limited flight ability and weak natural spreading ability. It mainly relies on eggs and larvae host plants or soils and vehicles with potted plants to spread long distances.

The quarantine measures that can be taken are

1 Strict quarantine is carried out, and once it is found, it is immediately blocked and culled.

2 Infected parasitic plants and their propagation materials are first placed in the greenhouse for 3 to 4 days, the eggs are hatched, and then larvae are chilled at 0 ° C for 1 to 2 weeks, and can also be fumigated with methyl bromide.

2. Physical control

1 In the greenhouse, the use of insect nets or other measures to prevent the entry of leaf miner is a more effective method.

2 Set the trapping point in the greenhouse at the beginning or end of the adult period, and place a fly paper at each point to trap the adult.

3. Biological control

Use natural enemies for biological control. There are about 15 species of parasitic natural enemies of the leaf miner. The most important ones are the green worm, the scorpion venom, the anti-peak, the double snail, etc., and the eggs are parasitized by releasing these parasitic wasps. In the egg, thus controlling the hazard.

4. Agricultural control

1 timely removal of weeds, sundries, etc. in the greenhouse, is extremely beneficial for the prevention and control of leaf miners.

2 After the harvest of the former crops, completely remove the leaves of the plants and concentrate them to eliminate the insect source. Prior to the next round of planting, disinfection is carried out in a greenhouse by steam or fumigation.

3 When the sporadic leaves are found to be damaged, the leaves of the insects should be removed in time, concentrated or buried, and should not be thrown.

5. Chemical control

In view of the fact that the spread of leaf miner spreads quickly, it is easy to produce drug resistance, and it is difficult to prevent and control. Chemical control must pay attention to the fact that only one agent can be administered at a time and alternately used. The control period should be carried out before the larvae 2 years old (the leaf miner larvae are 3 years old) or the majority of the insects are less than 20 mm in length. In the initial stage of chemical control, the drug should be sprayed twice continuously. The interval between treatments is 3 to 5 days, so as to reduce the density of the insects as soon as possible and reduce the loss. Then, the insect pests are controlled once every 7 to 10 days. Chemically available agents are: 75% chlorhexidine wettable powder 3000 to 5000 times solution, 1.45% fast WP 1000 to 1500 times solution, 5% taibao emulsifiable concentrate 2000 times solution, 48% chlorpyrifos emulsifiable concentrate 1000 times solution .

Pollution-free prevention

First, the high temperature shack: after the crop is finished, the residual plant will not be removed, and the shed will be sealed for 7-10 days, so that the shed temperature will reach 60 °C-70 °C on sunny days, and the residual strain in the shed will be removed after treatment. Labor and labor, and prevent the spread of insect sources.

Second, cover the insect-proof net: an insect-proof net is installed at the vents of the autumn and spring protection sites to prevent the exchange of insects in the open field and the shed.

Third, hanging yellow plate to trap adult: set up yellow plate in the protection ground, always keep the hanging height of the yellow plate 20 cm above the crop growth point, and maintain the adhesion of the yellow plate, can receive good results.

IV. Chemical control: When the amount of spotted fly is large, use fenvalerate to smoke the adult worm, and use it 2-3 times. For Liriomyza sativae and Liriomyza sativae, the leaf front can be sprayed with high-efficiency and low-toxic insecticides , and if it is a southern blotch, it should be sprayed on both sides of the leaf. The specific agent has 3000 times of diflubenzuron, 2500 times of liquid for killing and sleeping, and the like.

Therefore, it is not difficult to do the above steps to prevent the damage of the leaf miner. When we rest on the lawn, we can see a bright green landscape.

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