Litchi main pest control
2024-08-15 02:01:36
First, litchi ulcer disease The disease is commonly known as litchi rough skin disease. It is mainly harmful to the trunk, and the damage causes the leaves to fall, and in severe cases, the big branches or the whole plant die. Symptoms: At the beginning of the disease, the epidermis on the trunk and the branches are dull, and then gradually shrink, rough and cracked, and the cortex is lifted and detached. In severe cases, the xylem becomes brown, causing the branches above the affected area to die.
The law of onset: The disease has occurred most frequently and severely in recent years. There are many cases of old trees on the hillside, and various wounds on the trunk are beneficial to the invasion of pathogenic bacteria.
Control methods: (1) Try to avoid causing trunk wounds and reduce the invasion of pathogens. In the initial stage, the cortex on the diseased part should be removed in time. In severe cases, the diseased branches are removed and the bark and branches of the pathogen are burned. (2) The wound or cut after scraping is coated with copper oxychloride slurry or stone sulphur mixture in time to protect the wound and promote healing. Found that there is ulceration or other pests, you can use 50 kg of stone sulfur mixture solution to add 50 grams of 90% trichlorfon mixture and use immediately. (3) Strengthen tree management to enhance the disease resistance of plants to reduce the disease.
Second, the lychee is commonly known as stinky. Adults and nymphs suck the young shoots, flower spikes, and young juice, and the affected area turns brown, causing the flowers to fall.
Occurrence law: a generation occurs in the Litchi production areas in Guangdong, Guangxi, and Fujian. The adult worms hide in the back of the leaves or tree holes, stone gaps, etc. When the temperature is below 10 °C, it is almost inactive, and suddenly the tree is shaken and falls. When the temperature reaches 16 °C or above in March every year, spawning begins. Each time, 14 eggs are laid and arranged in blocks, and each female lays eggs 5-10 times. The egg stage is related to temperature. The higher the temperature, the shorter the egg period, and the earlier the nymph hatches, the more severe the lychee suffers.
Control methods: (1) Take the spray control when the drug resistance is the worst. When the spring is warm in March, the overwintering adult activities are ending, and the drug resistance is reduced. At this time, 90% trichlorfon crystals or 50% dichlorvos EC 800-1000 times solution should be sprayed, and the control effect is good. (2) Spray the 20% sterilized ester EC 2000 times solution or 2.5% deltamethrin 3000-4000 times solution and spray 1-2 times in the peak period of the young nymphs from April to May. (3) Manual capture. Use the sham of death to kill wintering adults.è½èŸ“ The activity is below 10 °C, and it is clustered in the dense leaf cluster. You can suddenly shake the tree in the morning to make the adult fall and concentrate on killing or burning. (4) Use the natural enemies to control the cockroaches. Every year in the early spring, when the litchi mites have just laid eggs, they start to lay bees every 10 days and put them three times.
The law of onset: The disease has occurred most frequently and severely in recent years. There are many cases of old trees on the hillside, and various wounds on the trunk are beneficial to the invasion of pathogenic bacteria.
Control methods: (1) Try to avoid causing trunk wounds and reduce the invasion of pathogens. In the initial stage, the cortex on the diseased part should be removed in time. In severe cases, the diseased branches are removed and the bark and branches of the pathogen are burned. (2) The wound or cut after scraping is coated with copper oxychloride slurry or stone sulphur mixture in time to protect the wound and promote healing. Found that there is ulceration or other pests, you can use 50 kg of stone sulfur mixture solution to add 50 grams of 90% trichlorfon mixture and use immediately. (3) Strengthen tree management to enhance the disease resistance of plants to reduce the disease.
Second, the lychee is commonly known as stinky. Adults and nymphs suck the young shoots, flower spikes, and young juice, and the affected area turns brown, causing the flowers to fall.
Occurrence law: a generation occurs in the Litchi production areas in Guangdong, Guangxi, and Fujian. The adult worms hide in the back of the leaves or tree holes, stone gaps, etc. When the temperature is below 10 °C, it is almost inactive, and suddenly the tree is shaken and falls. When the temperature reaches 16 °C or above in March every year, spawning begins. Each time, 14 eggs are laid and arranged in blocks, and each female lays eggs 5-10 times. The egg stage is related to temperature. The higher the temperature, the shorter the egg period, and the earlier the nymph hatches, the more severe the lychee suffers.
Control methods: (1) Take the spray control when the drug resistance is the worst. When the spring is warm in March, the overwintering adult activities are ending, and the drug resistance is reduced. At this time, 90% trichlorfon crystals or 50% dichlorvos EC 800-1000 times solution should be sprayed, and the control effect is good. (2) Spray the 20% sterilized ester EC 2000 times solution or 2.5% deltamethrin 3000-4000 times solution and spray 1-2 times in the peak period of the young nymphs from April to May. (3) Manual capture. Use the sham of death to kill wintering adults.è½èŸ“ The activity is below 10 °C, and it is clustered in the dense leaf cluster. You can suddenly shake the tree in the morning to make the adult fall and concentrate on killing or burning. (4) Use the natural enemies to control the cockroaches. Every year in the early spring, when the litchi mites have just laid eggs, they start to lay bees every 10 days and put them three times.
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