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花卉常见病害及其防治（Common diseases of flowers and their control）.doc

花匠小妙招
2024-12-23 04:03

花卉常见病害及其防治（Common diseases of flowers and their control）

花卉常见病害及其防治（Common diseases of flowers and their control） Common diseases of flowers and their control Category and damage The flower in the growth process, often encounter the pest infection effect and adverse environment, the occurrence of a series of pathological changes in physiology and morphology, resulting in the quality of flower and yield decreased, this phenomenon is called flower disease. There are many causes of flower diseases, which are mainly caused by infection of harmful organisms such as fungi, bacteria, viruses, plasmids, nematodes, algae, mites and Parasitic Seed Plants and the adverse environment. The flower diseases caused by these different characteristics are known as fungal diseases, bacterial diseases, virus diseases, nematode diseases and physiological diseases (or non infectious diseases). 1. fungal diseases Fungal diseases are caused by fungi. Fungi are low - class organisms that have no chlorophyll. Individuals vary in size, and most must be seen under a microscope. The development of fungi is divided into 2 stages: nutrition and reproduction. The mycelium is vegetative, and asexual and sexual spores are the propagule. They are mainly through the spread of wind, rain and insects seeds or flowers, flowers and plants, invades the body through the pores of epidermal passages, etc. and all kinds of natural orifice lenticels wound, also can directly invade the epidermal injury. Symptoms of white powder, rust, coal, stains, decay, blight, deformity, etc are found on the diseased parts. The main rose black spot, powdery mildew, leaf spot, chrysanthemum peony red spot disease, orchid anthracnose, rust, rose flower seedling blight etc.. 2. bacterial diseases Bacterial diseases are caused by bacteria. Bacteria are smaller than fungi, and are a single celled, low organism that can be observed only under a microscope. They usually use the seedlings and stubbles spread rain, water, soil, insects, flowers. The main body from the plant stomata, lentice