2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
Cucumber, belonging to the gourd family, comes from India. Therefore, it is warm, light and moisture-loving. In the process of growing, many summer residents, despite careful care, are puzzled by the problem of yellowing leaves. There could be many reasons for this.
Leaves on cucumbers turn yellow when affected by the most formidable disease - downy mildew. It develops quickly if the air humidity is increased, mainly in cold weather. Yellowish oil spots appear on the upper side of adult leaves near the veins, and a white-purple coating is observed on the underside. Over time, such leaves, starting with spots, dry out. The rapidity of the development of the process can be such that after a week it seems that deep autumn has come. We can no longer talk about fruiting.
As soon as the signs of the disease are revealed, it is necessary to stop watering, ventilate the greenhouse well, cover the soil under the cucumbers with something drying, for example, chalk or ash, remove the stained leaves and burn them. He althy leaves should be sprayed with a bright pink potassium permanganate solution to stop the development of pathogens.
More oftenbacteriosis (cucumber disease) is spreading in greenhouses. The leaves turn yellow at first with angular spots, which later dry out. On the underside
of such leaves are visible pink droplets of liquid. Similar cloudy drops are found on the sores of fruits. The disease progresses rapidly in wet weather. It is known that cucumbers do not like drafts, but greenhouses must be constantly ventilated, because they suffer even more from bacteriosis and stem rot.
As soon as the leaves on the cucumbers turn yellow, they should be sprinkled with garlic infusion (200 g of crushed leaves and arrows, filled with 5 liters of water and infused for 4 hours). Reduce watering in the greenhouse to a minimum, feed with infusion of various weeds or manure (fresh), give additional potash top dressing. You can treat diseased plants with Bordeaux liquid, but after that it will not be safe to eat the fruits for 20 days.
Cucumber leaves turn yellow in spots, acquiring a yellow-green color, with a lack of trace elements. This is the lesser of all evils. They need to be fed with special fertilizer, diluted according to the instructions. It is desirable to do this in the evening, after watering.
When damaged by a spider mite, the leaves on cucumbers first lighten, then turn yellow, and later die off. These insects are very small, visible only under a magnifying glass. You can get rid of them by treating with garlic infusion, provided that it gets on the underside of the leaves. Use of chemistryundesirable as cucumbers will become unsafe to eat within almost 3 weeks.
Leaves turn yellow on cucumbers and when attacked by black melon aphids. This usually happens in August. Against it, it is better to use garlic, pine needles, green soap and other home remedies. The body of the aphid is very delicate and even water heated to 50 0C will destroy it, but will not harm the plant.
As you can see, there are many reasons why the leaves on cucumbers turn yellow, and there are even more ways to combat this phenomenon. Timely measures taken will help to cope with any misfortunes, without which not a single summer season passes. Be mindful of your plantings and they will thank you with a bountiful harvest.
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