Cherry blossom white stripe feather disease
The symptom of white stripe feather disease is becoming more and more serious in recent years, especially the cherry blossoms. The disease mainly occurs in the roots of trees, and the fibrous roots gradually spread to the lateral roots and main roots. The characteristic of the disease is that the diseased root is covered with a layer of gray silk mesh, and then the root decays, resulting in detachment of the cortex and serious loss of root absorption function. If the disease is mild, the cherry blossom grows poorly, the tree is weak, and the serious one causes death.
The pathogen and regular pathogen is DematophoranecatrixHarting, and the sexual generation is rare Rosellinianecatrix. The bacteria also infected poplar, willow, ginkgo, paulownia, wax plum, begonia, mountain peach, tea, spruce, cedar, elm leaf plum, peony and peony and other plants. The pathogen overwintered with hyphae, fungal cords and sclerotia in soil or in diseased remains. White feather is a soil-borne root disease, and the infection cycle is not obvious. From April to May of the following year, under the condition of more Rain Water and moist soil, the fungal cord spread in the soil. Germs can invade from wounds and lenticels of tender roots. Generally, trees planted in poor drainage, weak growth and waterlogged depressions are seriously affected. The white stripe plume disease occurred seriously in Beijing from July to August, and there were small black spots on the mycelium membrane in the later stage, that is, the ascomycetes of the pathogen.
Integrated prevention and cure
(1) strengthen maintenance and management and pay attention to drainage in depressed land after rain. Rational fertilization, especially the application of compound fertilizer, can promote the growth and strength of root system. When planting new greens, choose disease-free seedlings. If serious plants have occurred, they should be cut down and burned in time.
(2) if the disease is light, the root irrigation of 50% Nongliling or 70% Tushuxiao 500 times solution.
- Prev
Control of cherry blossom leopard bark moth
Leopard beetle, also known as six-star bark moth, belongs to Lepidoptera, Leopard bark moth family. Distribution and harm: it is distributed in Henan, Hebei, Shaanxi, Shandong and other provinces in China. Feed on a variety of fruit trees and flowers and branches with larvae. Injurious: there is a feeding ring between the xylem and phloem at the base of the injured branch, and there is a wormway from bottom to top. There are several fecal holes on the branches and a large number of long oval insect feces are excreted. The upper part of the injured branch yellowed and withered, and it was easy to break in case of wind. Morphological characteristics of adults: the length of female moth is 20-38 mm, and that of male moth is 17-30 mm.
- Next
Management of summer cherry blossoms
1. Grass mulching has high temperature in summer, evaporates quickly, and the amount of water is more than that in other seasons, but it is still necessary to adhere to the principle of "no dry, no watering". Cherry blossoms are shallow root plants, and the roots are close to the surface of the soil and are easy to dry. Straw can be used to cover the roots of the trees, which can not only maintain moisture and resist drought, but also prevent the capillary roots of cherry trees from being exposed, and greatly reduce the evaporation of soil water. 2. Dry entanglement and drought prevention can be wrapped with straw within 2 to 3 years after planting to prevent the trunk from drying. Because the cherry blossom bark is thin, wrapping the bark can prevent it.
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