The most difficult thing in crop planting process is “identification of various diseasesâ€. According to the knowledge learned by Xiaobian, if you can't identify pests and diseases, you can't solve the problem of crops, which will seriously affect the growth of crops. Share how to easily identify crop pests and diseases.
The first step: different crops, choose to exclude
Different crops have different types of diseases. For example, corn has large spot disease, rice has rice blast, and cucumber has downy mildew. Let us first determine which crop is diagnosed or which crop. There are about a thousand kinds of diseases in various crops that we have come into contact with. This one excludes at least 50% of the diagnostic accuracy, and the difference in crops should be easy for everyone. At least farmers also know their own species. What is it.
The second step: the disease category, distinguishing and eliminating
We have identified the disease crops. The next four reasons for understanding the crops are:
Pathogens, adverse environment, phytotoxicity and fat damage.
To distinguish between these three reasons, it is not difficult to remember the following three characteristics:
Pathogen: From the field of Daejeon, there is a disease occurrence center. It is found that there is a diseased seedling. When there are several leaves that start to rot, the other two categories can be excluded.
Bad environment: If it is a disease caused by a bad environment, the same problem will occur in the same crop in a piece of land, or even in a city. If the leaves are frozen, or the fruit is dried, you can rule out Two other major reasons;
Phytotoxicity: If it is a phytotoxicity or a fertilizer that causes crops to have spots or yellow leaves, most whole fields will occur in general, and there will be no "several, few" caused by "pathogens". Nor will it be the same as a bad environment. If a village or the entire city has the same problem at the same time, then we can rule out the other two major reasons.
The third step: precise elimination of different periods and parts
After determining a pathogenic disease (also known as an infective disease), the third step is the disease caused by the growth stage of each crop. It can also be said to be "the pathogen that is willing to invade the specific plant parts in a special period", at least More than half are different.
For example, rickets and blights occur in the seedling stage of crops. Cucumber downy mildew occurs almost exclusively on the leaves. These different germs, which like “eatâ€, are certain for most of the time, so find information. At the time, you can add a few more words to the search engine, such as "corn seedling disease, watermelon vine disease, rice heading disease", so that we at least increase the diagnostic accuracy rate by at least 20%.
Step 4: Different environmental conditions
After determining the crops, disease majors, specific periods, and pathogens on specific crop organs, our diagnostic level has reached at least 80 points; however, there are still several diseases to distinguish, then we need to understand the weather. Look for "late blight", the data will show, what kind of bacteria, what crops are easy to infect, and then what temperature and humidity conditions occur, also known as "onset conditions."
Many diseases of peppers in the fruiting period are different. Late blight occurs in low temperature and high humidity, anthrax occurs in high temperature and high humidity environment, powdery mildew likes hot weather, bacterial sore disease likes strong wind and heavy rain, bacterial wilt blight It is easy to occur in repeated years of planting. Powdery mildew is caused by excessive use of nitrogen fertilizer. Viral diseases like aphids, white powder, and zinc fertilizer on peppers.
More pesticide knowledge , please pay attention to China Pesticide Network
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