论文部分内容阅读
西鹃小叶病在长江流域普遍存在,其症状表现为:2—3年生西鹃常于夏末在叶片上出现褪绿和杂色观象,随后,叶脉间呈黄绿色,病叶早落,花小色淡,新生枝条上部的叶片狭小,枝条纤细,节间缩短,形成簇生小叶,生长停滞。小叶病的原因是由于栽培介质中有效态锌含量过低而引起的。一般栽培西鹃多用山土,各地山土的pH值,一般在5—7之间,有些则偏碱,
Rhododendron leafhopper disease is prevalent in the Yangtze River valley and its symptoms are as follows: 2-3 years old Rhododendron often shows chlorotic and variegated images on the leaves in the late summer, followed by a yellow-green color between the veins, Small flowers pale, the branches of the upper branches of the narrow leaves, slender branches, internodes shortening, the formation of clusters of leaflets, growth stagnation. The cause of lobular disease is due to the low level of available zinc in the culture medium. General cultivation Rhododendron with mountain, around the mountain soil pH, generally between 5-7, while some are slightly alkaline,