Probably, almost all gardeners faced with the advent of broad cucumber leaves yellow spots, after which the plant has ceased to grow, bear fruit, and soon all die.And this picture is observed with the same frequency and in the open field and in protected, it would seem, the majority of greenhouse pests.Where does this attack and whether it can be overcome?Let's consider the reasons why there are yellow spots on the leaves of cucumber, and along with ways of dealing with them.
the case of inexperienced agricultural technician in the buff, we can assume banal leaf burn.There he is when in hot sunny weather on the leaves is water.Rounded drops create the effect of the lens, and the living tissue is burned underneath the focused beam of sunlight, resulting in formation of spots on the leaves and young cucumber fruits.That is why all the plants and cucumbers in particular, it is recommended to water either early morning or evening to heat before the plants have time to dry.If this is not possible, it is advisable to use a lower watering the aisle, leaving a relatively dry area around the stem to prevent rotting of the roots.
Another factor leading to the plant disease - deficiency of certain minerals in the soil.Yellowing of greenery can result in a lack of potassium or magnesium, and it usually appears on the older leaves.In this case, the yellow spots on the leaves of cucumber usually appear first on the edges, and then gradually capture the space between the veins.If this sign is observed in one or more plants, it is necessary to urgently conduct mineral fertilizer to keep the rest of premature aging.
will be much more difficult to cope with a variety of fungal diseases affecting both very young, and formed whip.Tread on the leaves of cucumber yellow patches of pale colors and the correct round shape usually indicate infection or askohitozom anthracnose.Called it a special fungus, prefer warm humid environment.Special danger he represents in rainy periods and plentiful dew.In this disease, you can also observe the appearance of dark brown or black spots on the depressed petioles, stems and fruit plants.Carriers of the fungus can be infected seeds and plants carrier, wintering in the soil.As surgical treatment can be applied spraying fitosporin a 1% solution of Bordeaux mixture.A damaged plants in any case can not leave for the winter!They need to burn as soon as possible to the rest of the stem in dispute could not affect the next planting.
other dangerous diseases, as a result of which appear yellow spots on the leaves of cucumber, is considered to downy mildew, or peronosporosis.It usually develops during the period of active fruiting - in late July or early August - and manifests itself in the form of small bright yellow dots.Over time they are increased, and then the sheet dies.Under favorable conditions for the fungus (changes in temperature, humidity, etc.), the infection is transmitted actively with water during rain and watering leads to the death of plants after 1-2 weeks after infection.
addition to the fungus, yellow spots on the leaves of cucumber virus can cause mild mosaic.Despite the innocuous title, the disease has a high risk for the plants, especially the young.Its carrier serves melon aphid, wintering in the roots of infected weeds.Chemical methods of struggle against the common mosaic does not exist, so preventing it is necessary to observe crop rotation and promptly get rid of weeds.
