What are the common pests of osmanthus trees?

What are the common pests of osmanthus trees? How should prevention be carried out? Also please have experience to help introduce the varieties of osmanthus many, there are four common: Jin Gui, Yin Gui, Dan Gui and Sijigui. The fruit is purple-black drupe, commonly known as laurel seed. Common diseases of osmanthus fragrans mostly occur in leaves, mainly brown spot, blight and anthracnose, which can cause early defoliation, weaken plant growth potential, reduce flower yield and ornamental value of osmanthus fragrans. Therefore, the cultivation network organized osmanthus tree brown spot disease, blight and anthracnose harm and control methods, the following detailed list for netizens reference. Osmanthus brown spot disease harm: osmanthus brown spot disease early onset, the leaves appear chlorotic yellow spots, gradually expanded into nearly circular spots, 2 to 10mm in diameter, or due to the expansion of spots restricted by veins become irregular spots. The lesion is yellow-brown to grayish brown, with a yellow halo around the lesion. Brown spot disease generally occurs in April to October, old leaves are more susceptible than young leaves. The pathogen overwinters on diseased leaves as hyphae, and produces conidia for primary infection in spring of next year. The conidia are transmitted by air current and raindrops. Osmanthus wilt disease harm: osmanthus wilt disease pathogen invasion from the leaf edge, leaf tip, occurred in the leaf edge and leaf tip of the leaf. At the beginning of the disease, the leaves of Osmanthus fragrans produced light brown spots, gradually expanded into round or irregular disease spots, and then expanded into nearly round or irregular gray brown spots with dark brown edges. The blight occurs from July to November and can occur all year round in sheds with poor environmental conditions. The pathogen is transmitted by conidia through wind and water. High temperature, high humidity, poor ventilation environment conducive to the disease. The disease was more serious in the old leaves and lower leaves when the plant grew weak and after overwintering. The harm of osmanthus anthracnose: osmanthus anthracnose infects osmanthus leaves. At the early stage of the disease, chlorotic spots appeared on the leaves of Osmanthus fragrans, and gradually enlarged to form round, semicircular or elliptical spots. Lesions are light brown to grayish white, with reddish brown rings at the edges. Under moist conditions, pale pink myxospore discs appeared on the lesions. Anthrax occurs between April and June. The pathogen overwinters in diseased leaves as conidia and is transmitted by wind and rain. Prevention and control methods of osmanthus disease: 1. The prevention and control of the following diseases should first reduce the source of infection. Such as autumn thoroughly remove disease leaves, potted osmanthus flowers to remove disease leaves in time. 2. Strengthen the management of osmanthus trees. Select fertile, well-drained soil or substrate for planting osmanthus fragrans; increase organic fertilizer and potassium fertilizer; planting density should be appropriate to facilitate ventilation and light transmission, reduce leaf humidity and reduce disease occurrence. 3. Spray 1:2:200 times of Bordeaux mixture at the beginning of the disease, and then spray 1000 times of 50% carbendazim WP or 1000 to 1500 times of 50% benlaite WP. 4. In the seriously ill area, when the seedlings are out of the nursery, they should be soaked and disinfected with 1000 times potassium permanganate solution. Osmanthus tree pest control methods: the main pest of osmanthus is mites, commonly known as red spiders. Once the disease is found, it should be disposed of immediately, and it can be used for mite cleaning, aphid mite killing, and triazole (azole) tin foliar spray. Spray evenly on both sides of the blade. Once a week, 2-3 times in a row, you can cure. Why doesn't the osmanthus tree bloom? How to make osmanthus blossom early