Golden Leaf Privet, Wood Rhinoceros, Privet genus, semi-green small shrub, has the reputation of "golden jade full hall". The golden leaf Privet leaves are beautiful in color and adaptable. During the growing season, the leaves of the Golden Privet take on a brilliant golden yellow. When landscaping, the golden leaf Privet is often selected to form shrub color blocks with purple leaf barberry, safflower berberi, dragon cypress, boxwood, shu juniper, etc., to highlight its strong sense of color contrast, so as to obtain excellent ornamental effect. In addition, the Golden Leaf Privet can be trimmed into a ball shape and is heavily used in combination patterns and hedge construction. However, the golden leaf Privet is often affected by a disease, that is, the golden leaf Privet leaf spot disease.
Occurrence characteristics
Privet leaf spot disease is a fungal disease. The disease is caused by the pathogenic fungus of the genus Streptosporidium hemiknospora. Privet leaf spot disease predominantly occurs on leaves and branches, and overwinters on plant disease residues in the form of mycelium. Conidia are transmitted by airflow or leaf contact, usually through invasive hosts such as wounds and stomata, with a incubation period of 10 to 20 days. The most suitable temperature for hyphae growth is 26 °C, and the most suitable temperature for spore germination at 18 °C to 27 °C. Therefore, the onset of golden leaf Privet leaf spot disease generally begins in early April, and July, August and October are the peak periods for the incidence of gold leaf privet leaf spot disease. Plots where the onset of the disease was more serious in the previous year, and the onset of the disease in the next year is generally more serious. Usually, on plots of continuous cropping, dense planting, poor ventilation, and excessive humidity, the incidence of golden leaf Privet leaf spot disease is more serious.
Specific performance
At the beginning of the onset of Privet leaf spot disease, small brown spots appear on the leaves, often with chakras, and the edges are yellow. The initial spots are smaller, and later expand into irregular reddish-brown spots. The center of the lesion is grayish-white, accompanied by some black mold spots, namely the conidia and conidia of the pathogen. With the gradual increase in temperature, the later disease spots begin to connect into pieces, eventually causing the entire leaf to scorch and fall off and die. The branches of the Golden Leaf Privet will dry out when they are harmed. When the disease is severe, it will lead to the death of the whole plant and pieces of the golden leaf Privet, and the entire planting area will show a large area of bare branches.
Prevention and control methods
(1) Under the environmental conditions of wet and cold, sweltering heat, continuous cropping, over-dense planting and poor ventilation, the leaf spot disease of the golden leaf Privet will occur more seriously. Therefore, the cultivation management of seedlings should be strengthened and the planting density should be reasonably controlled. At the same time, it is also necessary to pay attention to increasing the application of phosphorus and potassium fertilizers and reducing the amount of nitrogen fertilizer to improve the disease resistance of the entire plant.
(2) Properly prune, cut off over long branches, long branches and young branches to improve ventilation and light transmission conditions, especially to increase the ventilation and light transmission of the inner chamber, timely remove diseased branches, diseased leaves, dead branches, dead leaves, and dead leaves, and transfer them elsewhere for destruction.
(3) Pharmaceutical control: Spraying 1% of the fungus stop 2000 times liquid has a good effect on the prevention and treatment of golden leaf Privet leaf spot disease. In addition, 25% carbendazim wettable powder 500 times liquid, or 25% imidamine emulsion 500 to 600 times liquid, or 70% methyl tolbuzin 1000 times liquid, or 80% daisen zinc 500 times liquid, or 75% Bacillus Clear wettable powder 600 times liquid and other agents for prevention and control. The application should be applied evenly, and the application can be rotated. Generally about 10 days is a cycle period, continuous spraying of 4 to 5 times of the agent, you can effectively prevent and control the golden leaf Privet leaf spot disease.
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