2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
Probably, almost all gardeners were faced with the appearance of yellow spots on wide cucumber leaves, after which the plant stopped growing, bearing fruit, and soon died altogether. Moreover, such a picture is observed with the same frequency both in open ground and in a greenhouse that seems to be protected from most pests. Where does this attack come from and can it be overcome? Let's try to consider the reasons why yellow spots appear on cucumber leaves, and at the same time ways to deal with them.
If we are talking about an amateur inexperienced in agricultural technology, we can assume a banal leaf burn. It occurs when water remains on the leaves in hot sunny weather. Rounded droplets create the effect of a lens, and the living tissue below them is burned by a focused sunbeam, resulting in spots on the leaves of cucumbers and their young fruits. That is why all plants, and cucumbers in particular, are recommended to be watered either early in the morning or in the evening, so that the plants have time to dry before the onset of heat. If this is not possible, it is advisable to use bottom irrigation along the aisles, leaving a relatively dry area.around the stem to prevent root rot.
The next factor leading to plant disease is the deficiency of certain minerals in the soil. A lack of potassium or magnesium can lead to yellowing of greens, and this usually manifests itself on old leaves. In this case, yellow spots on cucumber leaves usually appear first along the edges, and then gradually capture the space between the veins. If a similar symptom is observed in one or more plants, then it is urgent to carry out mineral dressing in order to protect the rest from premature wilting.
It will be much more difficult to cope with various fungal diseases that affect both very young and mature lashes. Yellow spots of a pale color and regular round shape that have appeared on the leaves of cucumbers usually indicate infection with anthracnose or ascochitosis. It is caused by a special fungus that prefers a warm, humid environment. It is especially dangerous during rainy periods and with heavy dew. With this disease, one can also observe the appearance of dark brown or black depressed spots on the petioles, stems and fruits of the plant. Carriers of the fungus can be infected seeds and host plants wintering in the soil. As a surgical treatment, spraying with phytosporin or a 1% solution of Bordeaux mixture can be used. And damaged plants should never be left for the winter! They must be burned as soon as possible so that those remaining inside the stemthe spores failed to affect the following plantings.
Another dangerous disease that causes yellow spots on cucumber leaves is downy mildew, or downy mildew. It usually develops during the period of active fruiting - in late July or early August - and appears as small bright yellow dots. Over time, they increase, and then the leaf dies off. Under conditions favorable for the fungus (temperature changes, high humidity, etc.), this infection is actively transmitted with water during rains and irrigation and leads to the death of plants within 1-2 weeks after infection.
In addition to the fungus, yellow spots on cucumber leaves can be caused by the common mosaic virus. Despite the harmless name, this disease is highly dangerous for plants, especially young ones. Its carrier is the gourd aphid, wintering in the roots of infected weeds. There are no chemical methods of dealing with common mosaic yet, therefore, to prevent it, it is necessary to observe crop rotation and get rid of weeds in a timely manner.
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