保定绿化银杏苗木病害防治

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银杏苗木通称银杏树,俗名白果树、公孙树。园林雷竞技中的银杏树适应性强,对气候、土壤要求都很宽,是园林、行道、公路、田间林网、防风林带以及机关、学校、工厂雷竞技的理想栽培树种。   1.银杏苗叶枯病,在一般老栽培区比新栽培区发病严重。轻者银杏苗叶片提前枯死脱落,重者全部脱落,树冠光秃。8至9月为该病的发生高峰期。防治方法:加强管理,提倡冬季施肥,防止积水。   2.银杏苗黄化病,银杏苗早期黄化病是一种非侵染性病害,除干旱之外,地下害虫、土壤积水、起苗伤根、土壤缺肥等均可导致黄化现象的发生。防治方法:银杏苗圃地下害虫防治,及时排水,防止烂根,天气干旱时适当灌水。   3.黄蓟马虫害,该虫雌虫黄褐色,雄虫淡黄色,体长1.2毫米左右。有一对透明而细长的翅。防治方法:早春施肥,提高银杏苗叶片叶绿素含量,增强树势。   4.白粉蚧,又称桃白蚧,树虱子,盾蚧科。该虫借风力和苗木传播,每只产卵50至400只。防治方法:落叶后,发牙前20天用石硫合剂200倍,喷均树干。
The prevention and cure of seedling diseases of Ginkgo biloba in Baoding is commonly known as Ginkgo biloba, commonly known as White Fruit Tree and Gongsun Tree. Ginkgo biloba tree in landscape greening has strong adaptability and wide requirements for climate and soil. It is an ideal cultivated tree species for greening gardens, roadways, highways, field forest networks, windbreak belts and organs, schools and factories. 1. Ginkgo biloba seedling leaf blight is more serious in general old cultivation area than in new cultivation area. Leaves of light Ginkgo biloba seedlings withered and fell off earlier, while those of heavy Ginkgo biloba seedlings all fell off and their crowns were bare. The peak period of the disease is from August to September. Control methods: Strengthen management, advocate winter fertilization and prevent water accumulation. 2. Ginkgo biloba seedling yellowing disease, Ginkgo biloba seedling early yellowing disease is a non-infectious disease, in addition to drought, underground pests, soil water, seedling root injury, soil fertilizer deficiency can lead to the occurrence of yellowing phenomenon. Control methods: Ginkgo nursery underground pest control, timely drainage, prevent rotten roots, when the weather is dry, appropriate irrigation. 3. Yellow thrips pest, the female is yellow-brown, the male is light yellow, the body length is about 1.2 mm. It has a pair of transparent and slender wings. Control methods: Fertilizer application in early spring can increase the chlorophyll content of leaves of Ginkgo biloba seedlings and enhance tree vigor. 4. Powdery scale, also known as peach scale, tree lice, shield scale family. The insect spreads through wind and seedlings, laying 50 to 400 eggs each. Prevention and treatment methods: After defoliation, 200 times of stone sulfur mixture was used 20 days before teeth eruption, spraying the tree trunk equally.