Reading guide:There are many tomato growers, and it is not uncommon to encounter the "legs" of tomatoes turning black (tomato stems turning black). It's not like tomatoes want to be fashionable, and tomatoes it's sick. The disease has a great impact on the growth of tomatoes, and it is also contagious. As for what kind of disease it is, don't worry, netizens, because the situation of blackening is also different. Regarding the disease, many old vegetable farmers in the industry call it "black pole disease". At worst, it will affect the yield, and at worst, the tomatoes will die directly.
Regarding this tomato black pole disease, such a name is just a description of the disease in the colloquial language of our old vegetable farmers. In fact, infection in different growing locations of tomatoes can also produce different diseases. There are probably two parts of the disease that are most common: the bottom of the tomato stem and the middle of the tomato stem or the location of the branch, both of which turn black or brown. The color of such tomato stems is collectively referred to as black poles. But it's actually different diseases, so let's talk about these two cases.
The appearance of black at the bottom of the tomato stem is usually caused by blight or basal rot. Which one is causing it is still necessary to observe to determine. For this method of identification, it is relatively simple.
That.
1. Base rot, more precisely, stem base rot, also known as blight.
How to correctly judge the factors of the disease is mainly to see whether there are lesions around the stem at the location of the disease, and the surface is in a state of contraction. In the later stages of severe disease, a moldy substance of brown spider silk can be observed, and the tomato plants basically wither and die. Generally, it cannot be saved in the later stage of the disease, and it must be controlled in the early stage.
The disease must be solved at the beginning of the disease. Optional drugs: methyl phosphorus emulsifiable agent, used in the early stage of the disease. Generally, it needs to be sprayed 2-3 times, once every 7-10 days. In addition, you can also use Jinlei water powder, which is also good. 68% powder is diluted 700 times, sprayed 2-3 times continuously, with an interval of 7 days. There are other drugs, such as: Dixone, methyl tobuzin, green heng vicious spirit, etc., the specific usage can be described in the instructions.
That.
Second, the blight, in a specific point, is Phytophthora root rot.
The disease also occurs at the base of the tomato stem, and the disease is also found all around the stem, but these lesions are sunken. This is an important factor that distinguishes it from stem rot.
*The disease must be carried out at an early stage of the disease. Selected drugs: 58% methalene-manganese-zinc powder diluted 500 times or 722% Pulik water diluted 600 times or 72% Kelu wettable powder 700 times, etc., generally in the early stage of the disease to spray 2-3 times, about a week apart.
Regarding the blackening of the tomato stalks, this disease will be a little more numerous. However, the common ones are basically caused by stem blight, late blight, early blight and stripe spot, and if you want to solve the blackening of the stem, you need to start with these diseases.
That.
1. Late and early blight.
Late blight is characterized by a blackish-brown turn on the stem, especially on the diseased fruit. In early blight, irregular brown spots with mildew appear in the usual location.
Prevention and control drugs: methalin, chlorothalonil, carbendazim commonly used in late blight, and mancozeb commonly used in early blight. In addition, there is a drug that can be used at the same time for early blight and late blight, the drug Golden Redomir, see the instructions for use.
That.
2. Stem blight.
In general, the symptoms of stem blight are mainly oval brown spots on the stem, and they are elongated up and down. In the later stages of the disease, the inside of the stem is also rotten.
Prevention and treatment drugs: prevention and treatment drugs are recommended to start medication at the beginning of the disease, generally you can choose 80% mancozeb diluted 600 times or 64% alum wettable powder diluted 400 times, etc., need to be sprayed 2-3 times continuously, sprayed once every 4-7 days, and can be basically controlled. Drugs can be recycled to prevent drug resistance.
That.
3. Streak disease.
The disease, which mainly shows strip-shaped spots on the tomato stalks, is also black-brown in color. It is mainly on the epidermis and does not invade the inside of the stem.
Prevention and treatment drugs:The prevention and treatment drugs must also be in the early stage of the disease, and the selected drug 64% alum powder is diluted 500 times or 722% Pulik water diluted 800 times or 25% methanine powder diluted 800 times, etc., need to be sprayed 2-3 times continuously at an interval of 5-7 days. In addition, the drug must be recycled, otherwise drug resistance will develop.
Summary:The tomato leg turned black, not for the better, but because the tomato was sick. Approximately** is the above introduction, if you want to determine which one it is, you have to refer to the symptoms I talked about above. Next, it is the situation of medication, I simply recommend several drugs, in the prevention and treatment of a certain disease, must be recycled, otherwise drug resistance will occur. There is a better identification method or ** medication, you can share it in the comment area.