Lagerstroemia, scientific name Lagerstroemla1ndlcaL. , Alias ​​itchy tree, red peony, Lysimachia deciduous deciduous shrub or small tree; there are several varieties of silver osmanthus, Cuiwei and Hongwei, of which the red velvet application value in the landscaping. Lagerstroemia tree stretches gracefully, the trunk is smooth and clean, and the flower is bright; the flowering season is in the summer with less flowers, and the flowering period is long. From July to September, it is continuously open, so it is known as "Hundred Days Red" and there is a "summer green eye". This is a vain celebration." Lagerstroemia is a very good path or garden view tree species, suitable for planting in poolside, roadside and lawn. Lagerstroemia is widely distributed in China and is widely cultivated in the greening of cities in East China, Central China, South China, and Southwest China. However, Lagerstroemia is also a species of landscaping tree that is vulnerable to pests and diseases. Especially during the growing season, crape myrtle should be strengthened. Pay attention to pest control. Here are the details of the occurrence and control methods of some of the major diseases and pests of crape myrtle: First, the main pests and diseases of crape myrtle and its prevention and control methods 1. Powdery mildew Powdery mildew is a worldwide disease with a wide range of hosts. Lagerstroemia is an important target for it. Lagerstroemia powdery mildew is commonly found in China's provinces and cities where Lagerstroemia is planted. After the onset of disease, Lagerstroemia leaves are often yellow and fall off, directly affecting tree vigor and ornamental effects. Symptoms: Powdery mildew is a fungal disease that mainly damages the leaves, and young leaves are more easily infested than the old leaves; the disease also harms shoots, shoots, flower buds and buds. At the early stage of disease, small white patches appear on the leaves, and after expansion, they appear as round or irregular discolored patches, covered with a layer of white powdery mildew, and the later powdery mildew layer turns gray. After the flower is infected, the surface is covered with white powder layer, and the flower ear is deformed, losing its ornamental value. Plants infected with powdery mildew become dwarf, and young leaves are distorted, deformed and withered. Leaves do not develop and become smaller, and branches become deformed. In severe cases, the entire plant will die. The law of occurrence: Crape Myrtle Powdery Mildew is the wintering of mycelia on diseased shoots, diseased shoots or deciduous trees. When the temperature is appropriate in the spring of next year, the wintering hyphae begin to grow and develop, producing a large number of conidia, which are transmitted and invaded through the air flow. Disease usually begins in April and becomes severe in June. July-August will be slowed or stopped due to hot weather, but September-October may be re-issued again. Powdery mildew occurs severely during the rainy season or when the relative humidity is high. Partial application of nitrogen fertilizer, planting of dense plants, or poor ventilation and light transmission are all conducive to disease. Control methods: 1 Horticulture control: Lagerstroemia burgeons, so plants that are seriously ill can be cut off in the winter and burned in the same year to completely eliminate the source of the disease. If the house-planted crape myrtle is found to be infected with powdery mildew, remove the diseased leaf in time and place the potted flower in a ventilated and light-transmitting place. In field cultivation, the planting density should be controlled, and daily management should be strengthened. Phosphorus and potassium fertilizers should be added, and the application amount of nitrogen fertilizer should be controlled so as to increase the disease resistance of the plants. 2 Chemical control: In areas with severe onset, Bomi 3-4 degree lime sulfur can be sprayed on the branches before sprouting in the spring; 80% Zeinze wettable powder 500 times, or 70%, can be sprayed in the growing season. Thiophanate 1000 times, or 20% triadimefon (ie triadimefon) EC 1500 times, and 50% carbendazim WP 8000 times. 2, brown spot Brown spot disease is also a widespread disease on garden plants that occurs frequently in the crape myrtle growing season. Severe occurrence of brown spot disease often leads to a large number of yellow leaves and fall off of plants, affecting ornamental and flowering. Symptoms: The pathogen of Lagerstroemia brown spot is also a fungus. It is also mainly to invade the leaves, and usually the lower leaves begin to develop, and then gradually spread to the upper part. At the early stage of the disease, the lesions are of round or near-circular shape with a few sizes, and a little irregular shape; the lesions are purple-black to black, and the edges are light in color. Subsequently, the color of the lesions deepens, showing black or dark black, and the boundary between healthy and healthy parts is obvious. The color of the lesions in the center of the lesions has faded and the gray and black mold spots have appeared. When the disease is severe, the lesions are connected and the entire leaf quickly turns yellow and falls off prematurely. The law of occurrence: Lagerstroemia brown spot is caused by the infection of C. squaridae. The pathogenic bacteria is wintered on the diseased body in the form of mycelia or conidia, and the first infestation is carried out by conidia the following year. And reinfested and spread by air or wind and rain. Brown spot disease generally begins to occur in early summer and is seriously endangered in the fall. It is easy to break out in high temperature and rainy season, especially when the storm is frequent. Usually, the lower leaves are more susceptible than the upper leaves. Control methods: 1 horticultural control: early detection, timely removal of diseased branches, diseased leaves, and concentrated burned or buried in order to reduce the source of bacteria. Strengthen cultivation and management, pruning, and make the plants airy and transparent; the best for family pots is to replace new soil every year. 2 Chemical control: In the early stage of disease, 50% carbendazim WP may be sprayed 500 times, or 65% zeocin WP may be 1000 times, or 75% chlorothalonil WP may be 800 times. 3, coal pollution Coal pollution, also known as coal smoke disease, commonly occurs in garden plants throughout China. Invasion of crape myrtle is mainly caused by the damage of Lagerstroemia viviparum and Lagerstroemia speciosa, and the mucilage excreted by them is used as a nutrient to induce the large-scale reproduction of coal-borne pathogens. After the onset of disease, the diseased plant leaves covered with black mold layer, not only affect the ornamental value of crape myrtle, but also affect the photosynthesis of leaves, leading to plant growth and weakness, early defoliation. Symptoms: Lagerstroemia's pathogenic bacteria are also fungi. However, there are many types of pathogenic bacteria in coal contamination, and a variety of pathogens can be found on the same plant. Their symptoms are slightly different, but the black mold layer or black pulverized coal layer It is an important feature of the disease. Coal fouling mainly affects the leaves and branches. The disease firstly occurs along the main vein on the front of the blade and gradually covers the entire leaf surface. In severe cases, the surface of the blade, branches or even the petiole are covered with black coal powder; these black powders will Blocked leaf stomata and hindered normal photosynthesis. The law of occurrence: The pathogen of coal pollution is overwintering on diseased leaves and diseased branches in the form of mycelia or ascular capsules. Since mucilage from the exoskeleton of Lagerstroemia speciosa and Lagerstroemia viviparum can provide nutrients for the pathogens of coal contamination, the occurrence of coal pollution will occur in large quantities after these two pests occur. From late June to early September, it is the period for the damage of Lagerstroemia perfringens and Lagerstroemia speciosa. Moreover, the high temperature and high humidity at this time are also beneficial to the occurrence of this disease. Therefore, the spring (wintering pathogens), autumn (Chongqing And caused by long-spotted turtles) season is the peak period of Ziwei coal contamination. Control methods: 1 horticultural control: strengthen the cultivation and management, rational arrangement of planting density; timely pruning diseased branches and excess branches, in order to facilitate ventilation, light transmission, so as to enhance the digital potential and reduce the incidence. The potted crape myrtle in the family can be treated by removing the diseased leaves or washing the moldy layer of the leaf with water before use, which can play a certain control effect. 2 Pharmacy control: The prevention and treatment of long-spotted mites and cicadas, which will be introduced later, is a key factor in preventing coal pollution. For plots with more severe disease in the previous year, it can be sprayed with lime sulfur 3 to 5 degrees before germination in the spring to eliminate the source of overwintering. Plants that have been exposed to coal contamination during the growing season may be sprayed with 70% thiophanate-methyl wettable powder 1000 times, or 50% Our Butyl Rubber Stopper For Lyophilized Preparation is made of medically Butyl rubber.The procedures of vulcanization, die cutting, washing and packaging in the workshop are set to meet the relative cleanliness classes.Moreover the quality control system is established according to GMP standards. Our advanced complete automatic vacuum technics make vulcanization process available.Our products have a successful compatibility between rubber stoppers and medicine.If you are looking for a supplier in china, welcome to contact us. Butyl Rubber Stopper For Lyophilized Preparation Butyl Rubber Stopper For Lyophilized Preparation,Stopper For Lyophilized Preparation,Butyl Stopper Medical Rubber Stopper,Assorted Butyl Rubber Stopper SUZHOU CRH PHARMACEUTICAL TECHNOLOGY CO.,LTD , https://www.crh-health.com
Lagerstroemia Powdery Mildew
Lagerstroemia brown spot
Lagerstroemia contamination