Crop diseases are classified according to their pathogens and can be divided into fungal diseases, bacterial diseases, viral diseases, nematode diseases, and diseases caused by some parasitic plants. We can visually identify parasitic plants caused by parasitic plants. Fungal diseases and bacterial diseases each have their own unique conditions and conditions, and the most fundamental difference is the condition.
Identify by eye
Bacterial disorders: In general, pyoderma is a disorder that is inherent to bacterial diseases and is mostly accompanied by odors. If the plants die quickly and the leaves are still green, it is bacterial wilt. It is a bacterial disease.
Fungal Disorders: Fungal diseases are those around or at the site of the disease. For example, yellowing or wilting, molds such as downy mildew are accompanied by a black or white mildew layer on the back of leaves, while leaf mold is on the back of leaves. It grows gray-brown to dark brown moldy layer, spots, rust, powder, and sclerotia, such as sclerotinia and white peony disease.
Virus diseases: Virus diseases include diseases caused by bacterioplasma, viruses, and viroids. The symptoms of the disease include yellowing (such as orange yellow dragon disease), leaf rolling, or mosaic (such as cucumber mosaic virus disease). The main, few along the stem or fruit stripe-like (such as tomato virus streak).
Recognized by weather conditions
Virus diseases generally occur in high temperature and drought conditions; bacterial diseases mostly occur after heavy winds and heavy rains (because their pathogens mainly invade the wound); different types of fungal pathogens of fungal diseases occur under different climatic conditions.
Identifying diseased parts by plant
Some diseases only occur in the leaves, such as leaf mold, leaf spot, etc. Some occur only in the base of the stem or stem. For example, the incidence of tomato bacterial wilt is on the stem of the stem base, and stem rot Occurs only at the base of the stem.
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