Causes of the appearance of spots on the leaves of cucumbers
Spots on the leaves of cucumbers are not a reason to immediately destroy all plantations and be left without a crop. First of all, you need to pay attention to the methods of care. It is possible that the problem lies in improper watering or the quality of fertilizing. Also, spots on the leaves of cucumbers can appear if the plant is exposed to diseases or is affected by parasites. To determine the true cause of this crop change, you need to study all the signs of spotting.
Causes of the appearance of spots on the leaves of cucumbers
Features of cucumber bacteriosis
If yellow spots appear on the leaves of cucumbers, the problem may lie in several reasons, and one of them is cucumber bacteriosis. The main symptom of this disease is that watery patches begin to appear on the back of the cucumber leaves. After this, the disease manifests itself in the fact that the leaves of the cucumbers are covered with yellow-green spots. At first glance, it may seem that this is a common angular spotting. But this is not so, because bacteriosis changes not only deciduous veins, but also goes beyond them. Over time, the spots will be brown, but the yellow tint remains unchanged.
Treatment of such a disease should be carried out with fungicidal preparations. Give preference to substances such as Cuproxat or Oxychlor. You can also spray with Bordeaux liquid solution.
Malnutrition
Spots on cucumber leaves can turn yellow if:
- the farmer introduces an insufficient amount of nutrients into the soil;
- uses substandard fertilizers.
It is important to remember that cucumbers are picky crops, therefore they require special attention and care. If you do not know what to do in such a situation, apply fertilizing with mineral fertilizers. It is best to give preference to complex fertilizers, because they are aimed at improving the condition of cucumbers.
Cucumber mosaic
If yellow spots appear on the leaves of cucumbers, perhaps the reason lies in the disease with cucumber mosaic. It manifests itself in the fact that it forms yellow areas with a slight green undertone. Subsequently, the mosaic structure of the spots begins to develop.
Once you notice these signs, the first thing to do is remove and burn any damaged bushes. It is better to burn them away from garden plots. Nearby bushes should be sprayed with a drug such as Farmayod. Due to the fact that this disease is carried by aphids, you need to get rid of it too. To do this, use Kinmix.
Weather
Quite often, especially when it comes to growing cucumbers in a greenhouse, the plant undergoes a change in temperature. When the leaves are fully formed, the slightest contact with glass or film can lead to specks.
Temperature affects leaf health
To prevent this from happening, keep the foliage of the plant away from heaters and other things. To do this, it is necessary to tie up not only the main stem, but also the side shoots.
Causes of the white spot
White spots on cucumber leaves have a bad trait. They can infect the plant, both in open ground and in a greenhouse. Powdery mildew or white mosaic is considered the most common cause of this change. Although, white spots can be the result of exposure to spider mites.
- White mosaic is characterized by the fact that it forms white spotted areas on the surface of the leaf, in the form of a mosaic. Treatment for this disease follows the same principle as in the case of cucumber mosaic.
- Powdery mildew affects not only the foliage, but also the stem or fruit. It is characterized by the appearance of white spots with a slight tinge of rust. As soon as the disease begins to develop, the bush completely dies. The spread of symptoms most often occurs during wet weather. You can get rid of such a problem with the help of colloidal salt, from which the solution is prepared. 20 g of the substance is diluted in a 10-liter bucket of water. A solution of soap or copper sulfate will also help.
- Spider mite. Its main distinguishing feature is dotted spotted areas. If you look at the outside of a cucumber leaf, you will see such specks on it. Treatment takes place according to the following principle: first of all, remove all infected parts of the bush. After that, each bush is treated with Karbofos.
The presence of brown spots
Brown spots on the leaves of a cucumber appear if the plant begins to get sick with anthracnose or ascochitosis. Such fungal infections most often affect cucumber crops.
- Anthracnose is characterized by the fact that it brings small spots of brown to the leaves. Such spots have the effect of being depressed into the foliage. If the disease develops rapidly, then voids begin to form in such places. You can get rid of this fungal disease with the help of the drug Poliram.
- Ascochitosis is characterized by the fact that it forms not only brown, but also black areas. They can even appear on greens. The peel of such vegetables becomes white, and the inside begins to acquire a slimy structure. This fungal disease most often only affects greenhouse plants. For treatment, experts recommend using Bordeaux liquid and spraying every other day. Copper sulfate can also help.
Conclusion
As you can see, spots on cucumber leaves, in most cases, appear due to poor-quality care. If the farmer realizes his mistake and begins to correct the situation, then he will be able to save crops and get high yield rates. If the treatment is not carried out on time, then no harvest will be possible. It is recommended to carry out preventive measures and properly care for the plants, because the treatment will require much more money, effort and time from you.