Citrus will encounter many kinds of diseases and insect pests during its growth. If it is not prevented in time, citrus production will be reduced to varying degrees. This paper introduces several common control methods of citrus pests and diseases.

First, the characteristics of the occurrence of hazards, control indicators and suitable period

1, Starscream: mainly damages leaves, branches and fruits. Light spots appeared on the front of damaged leaves and fruit surface. The key control period is when there are 5- 10 eggs on each leaf (fruit).

2. Rust ticks: mainly damage leaves and fruits, and fruits form orange. When there are 2-3 insects or gray dew on each leaf and fruit, it is the key control period.

3. Scale insects: mainly harm leaves, branches and fruits. The damaged leaves turn yellow, resulting in rough branches and fruits. When there are 1 adult per leaf (fruit), the key control period is at the peak of nymph, especially at the peak of 1 age.

4. Leaver fly: it mainly harms leaves. There are many silvery wormholes on the damaged leaves. The germination period of summer and autumn shoots is the key control period. That is, the control period is 7- 10 days after the release of new shoots, when the leaf emergence rate of insects or eggs in shoots reaches 20%.

5. Canker disease: it mainly harms leaves, branches and fruits. The prominent feature of the lesion is a cavernous fissure with a slight depression in the middle. Shooting period, flowering period and young fruit period are the periods of chemical control.

6. Anthracnose: It mainly harms leaves, branches and fruits. There are small black spots on the lesion. The bud stage and young fruit stage of bamboo shoots in summer and autumn are the key periods for control.

7. Scab: It mainly harms leaves and fruits. The lesion swelled into a tumor. The germination period of spring shoots and the young fruit period are the key control periods.

At the same time, it is necessary to strengthen the prevention and control of pests such as red ladybug (including two kinds of skin-bursting insects and skin-sliding insects), Cerambycidae (both artificial killing and pesticide poisoning), fruit-sucking moth (both yellow light insect repellent and artificial killing) and citrus whitefly in time.

Second, the chemical control measures

1, mainly for red spiders and rust ticks. The following agents can be selected: 10% chlorfenapyr EC 4000 times, 70% chlorfenapyr EC 1500-2000 times, 15% pyridaben EC 3000 times and 20% chlorfenapyr EC 1500 times.

2, attending citrus whitefly. You can choose 1500 times of 25% Pushing wettable powder and 10 times of 65438% Dagong wettable powder.

3, attending scale insects. You can choose 1000 times of 40% Quick EC, 900 times of 25% Jigujing EC and 800 times of 35% Quick EC.

4, attending leaf miner. You can choose 20% Haoniandong EC 2500 times, 18% Shuangshuiji 400 times, 1.8% avermectin EC 3000 times, etc.

5, attending scab disease, ulcer disease, etc. You can choose 77% kocide wettable powder 600 times solution, 80% Chaobangsheng 800 times solution, 10% water dispersible granule 6000-7000 times solution and 50% Jialenong wettable powder 800 times solution.

6. Prevention and treatment of resin disease. Scrape the diseased spot to xylem with a knife (the scraped bark burns centrally), and then apply medicine. 80-fold solution of 70% thiophanate wettable powder, 20-fold solution of 80% zinc bendazole and 600-fold solution of 77% Cody wettable powder can be used to treat diseased spots.