Brazilian wood is a kind of foliage plant of the genus Dracaena, native to Guinea, widely distributed in tropical Asia and Africa. China's introduction of Guangzhou in the 1980s and its prevalence in Beijing in the 1990s. While more and more Brazilian wood entered the families of ordinary Chinese people, several pests and diseases that seriously harmed Brazilian wood have also been brought into China.
1. The larvae of the sugarcane larvae are mainly larvae feeding on the Brazilian woody cortex. When the damage is light, there are insect tracts and a small amount of worms are discharged. When the damage is heavy, all the fleshy parts of the epidermis are eaten and replaced by Insect droppings. Pressing the skin with your hand, there is a feeling of looseness. Examine the skin and you will find that it is full of insect feces. The adults of the sugarcane moth specifically chose Brazil's wounds for spawning, so all wounds on the stakes are heavy. In particular, the sawing at the top of the stakes is more severe if the wax is not sealed or the white wax is damaged. In Beijing, the sugarcane moth has latent habits in the soil during winter. At present, the sugarcane moth has caused serious losses in flower production. The loss rate of Brazilian wood can reach as high as 50%. In some bases, even Brazilian wood can be completely destroyed. There are sometimes only one or two pots of brazilian moths that occur in homes.
Second, stalk rot caused by leptosphaeria. Symptoms often appear on stems, forming irregular black lesions on the phloem. There are grayish or black moldy layers on the lesions. In severe cases, the bast is completely stripped, black rot, and the damaged wood is water-stained, slightly brown, and bacteria invade. The xylem quickly expands up and down, causing rot, forming a large amount of black mold layer at the incision or wound. Symptoms can also occur in the leaves, mostly from the leaf margin or wound lesions appear first, the beginning of a brown dot, quickly expanded into a dark brown irregular long-shaped spots, edge water stains, severe leaves cause dead. The current stalk rot has caused great losses in production. It is often associated with the moth Tartus tabulaeformis, and often the stems of insects are frequently infected.
III. Small locusts There have been reports of serious damage to Brazilian wood by a small locust. In 1997, a small mite was found in Guangdong Province, China, and it was identified as: Bacterial bark, and the damage pattern of the victim is similar to that of the sugar beetle. The body size is small, the dung is fine, and it is usually associated with cane. The moths come together. Fourth, the family control law First of all, we should pay attention to prevention, when buying Brazilian wood must be carefully selected, choose insect-free disease-free strains. During the cultivation process, it is necessary to inspect regularly and find the insects early. After discovering the victimization, timely prevention and control will be carried out. 1. Clean up the victim to find the pest and clean it first. Remove the insect excrement, find the larvae crushed to death in time, remove the color of the victim, the dead part. 2. Summer protection measures Summer is the peak period of the occurrence of the sugarcane moth, and care should be taken. Can be sprayed with insecticide protection, with 2000 times 20% chrysanthemum killing cream or 250 times the 20% speed kill diced EC good effect. Sugarcane moth adults have night out, can be combined with home smoked mosquitoes, put Brazilian wood near the mosquito repellent, and drive the adults that produce eggs at night. 3. The winter protection measures occurred in winter, and the occurrence of stalk rot was heavier. Because low temperature and high humidity are conducive to stalk rot, control the watering. After the illness was found, the fungicide was sprayed in time, and 70% thiophanate-methyl WP could be used 800 times and 50% acetaminophen WP 800 times. In addition, using the habit of overwintering under-ground soil and the characteristics of stalk rot pathogens found in soil, the 90% trichlorfon crystals and 50% thiram can be mixed in fine sand, in a 1:1:200 ratio. Poisonous soil is evenly sprinkled on the potted soil surface. 4. Do not leave behind the Brazilian wood that has been seriously affected by the disaster. The Brazilian wood should be removed in a timely manner and be treated. Deeply bury or peel the skin and put it in the sun. See insects kill in time.
As the sugarcane moth is a potentially dangerous insect, it not only damages Brazilian wood, but also harms important economic crops such as bananas and sugarcane. Once it spreads to the wild in southern China, it will cause disastrous agricultural production. as a result of. Therefore, we propose to actively carry out comprehensive prevention and control of this pest to prevent its spread and spread.
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