Plant disease had to prevent the relevant knowledge

Plant disease has to be the prevention of disease-related diseases, generally divided into two kinds of physiological diseases and parasitic diseases…
Physiological diseases, mainly due to climate and soil conditions are not appropriate to cause. “..
Often caused by physiological diseases are: summer light caused by burns; winter cold damage caused by; too much water lead to rot; water shortage caused by coke side of the blade, wilting; lack of certain nutrients in the soil, the lack of disease and so on.
Parasitic disease is due to fungi, bacteria, viruses, nematodes and other infections caused by flowers.
These morphological differences, but most of the parasitic and virulence, and has a strong fecundity, from the susceptible plants through a variety of ways (stomata, wounds, insects, wind, rain, etc.) spread to healthy plants up
, In the appropriate environmental conditions, growth, development, reproduction, transmission, and again and again, and gradually expand the spread.
Therefore, these diseases on the flowers caused the greatest harm.

Fungi

Fungi are low organisms that have no eucaryotic chlorophyll.
It is mycelium as a vegetative body to spore propagation, flower disease is the most important category.
Most of the fungal diseases have obvious symptoms, such as mold, powder, rust, points, filaments, etc., these features are one of the main basis for identification of fungal diseases.
Common fungal diseases are powdery mildew, anthrax and so on.
Bacteria are a type of single – celled prokaryotic organisms that reproduce in a split fashion.
Bacterial disease is characterized by the organization of the affected tissue was Shuizhuang-like or lesion of light transmission, and in wet conditions from the site of the outbreak of bacterial mucus, the emergence of “overflow pus” phenomenon, which is the main basis for identification of bacterial diseases
one.
Common bacterial diseases are iris bacterial soft rot and so on.
Virus is a very tiny parasite. Virus is a very tiny parasite..
Must use the electron microscope to observe its shape.
It is parasitic in the living cells of flowers, and can flow with the host juice flow in the body of the flower spread to the whole plant, causing the whole plant disease.
Virus disease often presents mosaic, yellow, deformity, ring spot and other symptoms.
Common viral diseases are narcissus virus disease.
Nematodes are a class of lower animals.
Nematode body slender, slightly pointed at both ends, body length is generally 1-2 mm, like a roundworm.
A small number of female worms were spherical or pear-shaped.
More live in the soil, parasitic in the roots of flowers, stimulate the local host cell proliferation, the formation of tumor-like.
Common nematode diseases are cyclamen root knot nematode disease.