Planting Tips

Chapter 55 What are the common bacterial diseases of flowers?how to prevent
Bacteria are single-celled microorganisms.Diseases caused by bacteria infecting flowers are called bacterial diseases.Bacterial infection is mainly transmitted through stomata, nectaries, wounds, etc., and is generally spread by running water, wind and rain, insects, soil, and diseased plant remnants.The main symptom types of bacterial diseases are rot, necrosis, tumor, deformity and wilting.Its main manifestation is that the affected tissue is water-soaked, and under humid conditions, bacterial mucus often overflows from the diseased part, resulting in "pus overflowing".This is one of the important basis for identifying bacterial diseases.

Common bacterial diseases include soft rot, root cancer, bacterial perforator, bacterial leaf spot, etc., which are described below.

(1) Soft rot generally harms vegetative organs such as rhizomes, corms, bulbs, and tubers, and sometimes harms leaves or stems.Usually the affected area is water-soaked at first, then turns brown, and finally becomes slimy and rotten.Under the condition of high humidity, it becomes a rancid slurry; under dry conditions, the diseased part loses water and becomes powdery and shriveled.Soft rot mainly harms bulbous flowers, Clivia, and cactus.Control methods: cut off the diseased plants, apply sulfur powder or zinc zinc on the cut; burn the diseased roots and leaves; practice crop rotation, disinfect the soil and propagation materials before planting, and use 1% formalin or streptomycin 1000 times solution.

(2) Root cancer bacteria often infect the roots and form irregular tumors, which are light brown in the early stage, rough in surface, soft or spongy, and then darken in later stages, and the internal tissues become lignified and become hard tumors , leading to the death of the whole plant in severe cases.Root cancer mainly harms plum blossoms, cherry blossoms, chrysanthemums, roses, dahlias, carnations, geraniums, and begonias.Control methods: plant disease-free seedlings or implement crop rotation; remove diseased tumors immediately after the onset, and apply sulfur powder or 0.1% mercuric chloride water for disinfection.

(3) Bacterial perforation disease mainly harms the leaves of cherry blossoms, plum blossoms, peaches, apricots, etc., and sometimes the branches and fruits are also damaged.In the early stage of the disease, light brown water-soaked, nearly round or irregular-shaped lesions appeared on the leaves, with a light yellow halo around them. Later, the lesions continued to expand and turned dark brown or purple-brown. The edges of the lesions became lignified, causing perforation .

防治方法：发病前喷65％代森锌600倍液预防；及时清除受害部分并销毁；发病初期喷洒50％退菌特800～1000倍液。

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