Key points of Disease and Pest Control of growing Citrus in Autumn

Autumn is not only the autumn shoot period of citrus, but also the expansion period of fruit. The autumn shoot is the fruiting mother branch of the fruit tree in the coming year. the quality and quantity of the autumn shoot directly affect the yield and quality of the coming year. Therefore, while doing a good job in citrus fertilizer and water management, it is particularly important to do a good job in the control of diseases and insect pests.

I. the guiding ideology of prevention and control

Orange fruit is a fresh fruit, in the prevention and control of diseases and insect pests should be people-oriented, to ensure the physical and mental health of fruit growers and consumers, so it is necessary to vigorously promote green pollution-free control technology, such as the use of frequency vibration insecticidal lamp, electronic moth lamp, sex attractant, sweet and sour wine to kill citrus pests; promote the use of efficient, low-toxic and pollution-free pesticides, such as biological pesticides; promote orange fruit bagging to reduce the use of pesticides. Pesticides should not be sprayed within 30 days before orange picking.

II. Characteristics of occurrence and damage, control indicators and appropriate period

1. Red spider: mainly harms leaves, branches and fruits. Pale spots appeared on the front of the damaged leaves and on the surface of the fruit. When there are 5-10 worms and eggs on each leaf (fruit), it is the appropriate period for key control.

2. Rust tick: it is mainly harmful to leaves and fruits, and the fruits form mandarin seeds. When there are 3 insects on each leaf and fruit, or when gray dew is seen, it is the appropriate period for prevention and control.

3. Scale insects: mainly harmful to leaves, branches and fruits. The damaged leaves turned yellow, resulting in rough shoots and fruits. When there is one adult scale per leaf (fruit), it is the most suitable period for control in the nymph peak, especially in the 1st instar.

4. Leaf miner: mainly harmful leaves. There are many silver worms on the damaged leaves. Summer and autumn shoot germination is the key prevention and control period. That is, 10 days after shooting, when the leaf rate of insects or eggs in the tender shoot reaches 20%, it is the appropriate period for prevention and control.

5. Canker: it mainly harms leaves, branches and fruits. The prominent feature of the disease spot is a spongy crack with a slight depression in the middle. Sprouting, flowering and young fruit stage are the suitable periods for chemical control.

6. Anthrax: mainly harms leaves, branches and fruits. There are black dots on the spot. Summer and autumn shoot emergence period and young fruit stage are the key suitable periods for prevention and control.

7. Scab: mainly harmful to leaves and fruits. The disease spot protrudes into a tumor. The sprouting period of spring shoot and the stage of young fruit are the key suitable periods for control.

At the same time, it is necessary to strengthen the control of gibberellin (including explosive skin worm and skin slipper), longicorn beetle (artificial killing and pesticide poisoning), fruit-sucking armyworm (yellow light repellent and artificial killing) and citrus whitefly in time.

III. Chemical control technology

1. Treatment of red spider and rust wall lice. The following medicaments can be selected: 4000 times of 10% paracetamol EC, 1500Muth2000 times of triamcinolone acetonide EC, 2000 times of 70% propargite EC, 3000 times of 15% pyridaben EC, 1500 times of 20% acarine EC, and 20% Weiling 2500 times (special effect on the control of rust wall lice).

2. Mainly treat citrus whitefly. You can choose 1500 times of 25% buprofezin wettable powder and 1000 times of 10% Dagongchen wettable powder.

3. Mainly treat scale insects. Can choose 40% speed killing EC 1000 times, 25% Zaijing EC 900x solution, 35% Kuaike 800x solution.

4. Main treatment of leaf miner. Can choose 20% good year winter EC 2500 times liquid, 18% insecticidal double water agent 400 times liquid, 1.8% avermectin (parasite) EC 3000 times liquid and so on.

5. the main treatment is scab, ulcer and so on. You can choose 77% Kesha wettable powder 600 times liquid, 80% super Bangsheng 800 times liquid, 10% high water dispersible granules 6000 Mel 7000 times liquid, 50% Garinon wettable powder 800 times liquid, and so on.

6. Prevention and treatment of resin disease. Use a knife to scrape the spot to the xylem (the scraped bark is burned off), and then apply medicine. You can choose 80 times solution of 70% topjin wettable powder, 80 times solution of 80% Dysenmeng zinc, and 600 times solution of 77% Jiaode wettable powder to treat plaque.