(1) Citrus tridentatus (citrus red spider): It is one of the most serious pests commonly found on citrus in China. The main damage citrus leaves, shoots and fruits. The damaged leaves and fruit turn grey when severe and lose their luster until they are yellow and fall off. From April to June and from September to November, it is the peak period.

a. Clear Garden in spring: Cut off the dead branches, pests and branches, remove the orchard weeds. Before germination, 0.8-1.0 bumeido lime sulfur, pineine mixture 8-12 times or 20% clam wettable powder 40-50 times can be used.

b. Sprout to flowering period: 0.3-0.5 Baume degree lime sulfur, 5% thiazolyl ketone/WP 1000-1500 times, 10% Benzoate 1500-2000 times or 50% trisulfide Phosphorus 1200 to 1500 times liquid and so on.

c. Other Seasons: Use 20% dicofol 1000 times solution, or azoline, fenbutatin 1500 to 1800 times solution, 5% nisone 2000 times solution, 10% dying net 1000 to 1500 times solution, 20% Fast-acting ketones 3000 to 4000 times, 73% Kete 1500 to 2500 times, 50% bromine 1500 to 2000 times and so on.

d. Protect natural enemies, use drugs rationally, implement health care cultivation, and protect and use natural enemies such as ladybugs, predators, food horses, grasshoppers, and parasites.

(2) rust wall niches: China's citrus production areas are distributed, is one of the serious pests. The young and rufous colonies mainly harmed the branches, leaves and fruits of citrus, and the damaged skin or leaf surface turned dark brown. From July to September, it was the occurrence and damage period.

a. Control period: from mid-May to October.

b. Agricultural control: High temperature and drought season, irrigation and drought resistance; increase organic rotting fertilizer to improve the orchard ecological conditions, enhance the body's resistance to insects; winter garden, cut off the blight branches, weak branches, trunk brush lime water once, To eliminate the source of overwhelming insects.

c. Chemical control: Use lime sulfur, Bordeaux mixture 0.3-0.4 degrees, spray 1 or 2 times per month (lower temperature in hot weather, moderately low concentration), spraying amount should not be too large to avoid phytotoxicity; 50% 3 Cyclic tin wettable powder 3000 times, 65% dexamethasone 600 to 800 times liquid, 30% speed radix 600 times, 50% ethionate 1000 to 1500 times liquid.

(3) Leaf leaf moth: It occurs in all citrus production areas in China. The larvae invade the young leaves, shoots and young fruit under the epidermis. 9 to 15 generations occurred in 1 year, and larvae and mature larvae were overwintering under the epidermis of late autumn shoots and young shoots of winter shoots. It usually occurs at the beginning of May, and the period from July to September is the height of damage. The summer shoots are lightly damaged, and the autumn shoots and late autumn shoots are heavy.

a. Agricultural control: In conjunction with the winter garden, cut the victim's shoots and burn it. Remove summer shoots and sporadic early autumn shoots as much as possible, and put them together. Strengthen the management of fertilizers and waters to promote the neat shoots.

b. Chemical control: Use 1% or 1.8 avermectin EC 2500-4000 times solution, 3% acetamiprid EC 1000-2000 times solution, 80% dichlorvos EC 800 times, 40% Dimethoate 1200 times, 20% diflubenzuron rubber suspension 1000-1500 times, 5% Dinglong Long EC 1500-2000 times or pyrethroids 2000-6000 times etc.

c. Protect natural enemies: Protect and use natural enemies such as parasitic bees.

2. Diseases

1 Citrus Huanglongbing: Most citrus production areas occur. It is an important disease of citrus in our country and can cause the entire citrus tree to die. Citrus huanglongbing should be the main defense.

a. Strict quarantine system to prevent diseased seedlings and diseased ear from entering disease-free and newly planted areas.

b. Control of Citrus sinensis: Citrus aurantium is a host plant of hibiscus, and citrus groves should be disabled for hedgerows. The hibiscus mainly damages shoots and young leaves. Therefore, in the spring and autumn, the prevention and treatment of hibiscus should be done well. In the summer, the control of shoots must be done, and in the winter, the clearing groves should be used to destroy the storks that cluster over the winter in the back of the leaves.

c. Exclude diseased trees to prevent the source of infection. Pathogens are unevenly distributed within the tree, and the incubation period varies. If a diseased tree is found, the entire tree should be thoroughly excavated and burned. The sick garden must be separated by more than one year after the tree is dug and the planting position should be staggered before the citrus can be replanted.

d. Strengthen orchard management and increase tree vigor.

2 Scars: Citrus scab is a common disease in citrus growing areas in the subtropical and northern subtropical regions of China. Zhejiang, Fujian, Taiwan, Jiangxi, Sichuan, Yunnan, Guizhou, Guangxi, and Guangdong provinces (autonomous regions) have occurred. Leaf damage caused by falling leaves, branch shoots suffer from poor growth, fruit damage is easy to fall off, or the disease is small and deformed, poor quality.

a. Strengthen the winter garden, cut off, burn diseased leaves, spraying 10 to 15 times the pine resin or Baume 0.8 to 1 degree lime sulfur 1 or 2 times, reducing the number of pathogenic bacteria.

b. Transform the closed orange groves, strengthen spring pruning, and improve the ventilation and light transmission conditions in the orange groves. Strengthen fertilizer and water management, prevent other pests and diseases as soon as possible, promote strong tree vigor, shoot neat new shoots, and increase tree disease resistance.

c. When building orchards, use disease-free seedlings to prevent the introduction of pathogens.

d. Chemical control: 1 The prevention and control focus is on young leaves and young fruit. Before spring shoots germinate until the shoot length is 2 mm, the spring shoots are sprayed, and the young fruit is sprayed at 2/3 of Xiehua. The agent can be used: 75% chlorothalonil wettable powder 500-800 times, 50% more mildew wettable powder 800-1000 times, 77% can kill 2000-type 800 times, 80% wettable powder 400 to 600 times liquid, 65% thiobacillus Wei wettable powder 1000 to 1200 times. According to the disease with a certain number of spraying, usually 10 to 15 days to spray once.

3 Citrus anthrax

Citrus anthracnose commonly occurs in citrus producing areas and can cause defoliation, dead shoots, cracked branches, and fruit rot.

a. Strengthen cultivation management. Strengthen orchard management and improve tree resistance. Expanding the hole, deep turning, planting green manure, increasing organic manure, supplementing phosphorus and potash fertilizers, supplementing micronutrient fertilizers, paying attention to timely irrigation and drainage, paying attention to pruning, and timely controlling other pests and diseases. Second, in the winter, it is necessary to clear the garden, cut off the branches of the disease, remove the diseased fruit, clear the dead leaves, fallen leaves, and diseased fruits on the ground and reduce the source of bacteria.

b. Chemical control. Spray once in the spring, summer, autumn shoots and winter, spray protection at the beginning of the disease, so as to reduce or prevent its direct intrusion. Commonly used bactericides can effectively prevent pathogens from concentrating on germination. The agents are: 0.5:0.5:100 Bordeaux mixture, 77% WP 500 to 600 times, 0.3 Baume of lime sulfur, 70 % Thiophanate-methyl wettable powder or 50% carbendazim wettable powder 600-1000 times.

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