How to diagnose plant diseases in the field?

The procedures for disease diagnosis usually include:

(1) Carefully observe all symptoms of diseased plants, including plant symptoms such as discoloration, necrosis, rot, wilting and deformity, as well as pathogenic diseases such as mold, powder, rust and granules. , find out the symptoms that play a key role in diagnosis, and identify and describe the symptoms.

(2) careful analysis, including asking and checking data, should grasp the characteristics of various diseases as much as possible, and investigate and ask about medical history and related files.

(3) Sampling inspection combined with necessary comprehensive inspection and special inspection such as microscopic inspection and autopsy.

(4) Using the step-by-step elimination method, we can get appropriate conclusions, so as to judge the types of plant diseases: infectious diseases or non-infectious diseases, such as which pathogens caused infectious diseases, such as trauma or nutritional deficiency, and what nutrition is lacking.