Yellow leaves on cucumbers: the causes and methods of fighting

Cucumber, belonging to the family of pumpkin, comes from India. Therefore, it is warm, light and hygrophilous. In the process of cultivation, many summer residents, despite careful care, are puzzled by the problem of yellowing of the leaves. The reasons for this can be many.

The leaves turn yellow on cucumbers when they are affected by the most formidable disease - downy mildew. It develops rapidly if the humidity of the air is increased, mainly in cold weather. On the upper side of the adult leaves, yellowish oil spots appear near the veins, and on the underside there is a white-purple plaque. Over time, such leaves, starting with the spots, wither. The rapidity of the development of the process can be such that in a week it seems as if a deep autumn has come. We can no longer talk about fruit bearing.

As soon as the signs of the disease are revealed, it is necessary to stop watering, ventilate the greenhouse well, cover the soil with cucumbers with something dry, for example, chalk or ash, remove the leaves with stains and burn them. Healthy leaves should be sprinkled with a bright pink solution of potassium permanganate to stop the development of pathogens.

More often bacteriosis (cucumber disease) spreads in the greenhouse . The leaves turn yellow at first with angular spots that later wither. On the underside These leaves can be seen pink droplets of liquid. Similar cloudy drops appear on the sores of the fruit. The disease progresses sharply in wet weather. It is known that cucumbers do not like drafts, but greenhouses need to be constantly ventilated, because they suffer even more from bacteriosis and stem rot.

As soon as the leaves turn yellow with cucumbers, they need to be sprinkled with garlic infusion (200 g of crushed leaves and arrows filled with 5 liters of water and infused 4 hours). Watering in the greenhouse should be reduced to a minimum, supplemented with infusion of various weeds or manure (fresh), give additional potassium top dressing. You can treat diseased plants with a Bordeaux liquid, but after that, within 20 days, eating fruits in food will be unsafe.

Leaves of cucumbers stain yellow, acquiring a yellow-green color, with a lack of trace elements. This is the least of their evils. They need to be fed with a special fertilizer, diluted according to the instructions. It is desirable to do this in the evening, after watering.

If damaged by a spider mite , they lighten first, then the leaves turn yellow on cucumbers, and later die off. These insects are very small, visible only under a magnifying glass. To get rid of them you can by treatment with garlic infusion, provided that it will fall on the underside of the leaves. The use of chemistry is undesirable, since cucumbers will become dangerous for food intake for almost 3 weeks.

The leaves turn yellow on cucumbers and when they attack black melon aphids. This happens, as a rule, in August. Against it, it is better to use garlic, pine needles, green soap and other home remedies. The body of the aphids is very tender and even water heated to 50 ^° C will ruin it, and the plant will not harm it.

As you can see, there are many reasons for yellowing leaves on cucumbers, but more ways to combat this phenomenon. In time, the measures taken will help to cope with any misfortunes, without which no dacha season passes. Be attentive to your planting, and they will thank you with an abundant harvest.