If the temperature regime and the humidity level of the air are disturbed in the greenhouse, then the carefully cultivated cucumber bushes begin to ache. The earlier to detect and identify the disease, the more healthy the harvest will remain. So let's look at the cucumber in the greenhouse.
The most common diseases of cucumbers in greenhouses
Anthracnose is a fungal disease of cucumbers, which arises due to high humidity in the greenhouse. The disease begins with the appearance of light brown spots on the stems and leaves, and then on the fruits of deep ulcers with pink mucus. Infected fruits must be immediately destroyed, since they will not grow to normal size.
Control measures : if you find the first signs of the disease, sprinkle once a week with a solution of Bordeaux liquid (1%).
Downy mildew ( peronosporosis ) has become the most common and dangerous disease of cucumbers in the greenhouse. Most often appears in early August after a sharp change in temperature, strong condensation on the film or watering with cold water. First, oily green spots appear on the leaves, increasing during the week, then the leaves turn brown as after the burn and dry up after 2 to 3 days.
Control measures :
- cessation of watering and top-dressing for 6 to 7 days;
- spraying after lowering the humidity with a warm (22-24 ° C) solution of Topaz (1 ampoule per 10 liters of water);
- ventilation of the greenhouse, not allowing a decrease in temperature in it (during the day 20-25 ° C, and at night 18-22 ° C);
- For the night, the plants are additionally covered to maintain the temperature.
Root rot on cucumbers occurs when using in the greenhouse soil previously used for growing cucumbers, a sharp drop in temperature and with improper planting of seedlings. You can determine by the fact that the leaves during fruiting begin to fade, and the stem at the very roots turns yellow and cracks appear.
Control measures:
- when planting, do not strongly soil the seedlings and do not pour the earth over the summer;
- if found, prepare a solution (dilute 1 teaspoon of copper sulfate, 3 tbsp chalk for 0.5 l of water) and moisten the affected part of the stem to the roots;
- destroy the affected plants together with the soil and burn, and pour the hole with a solution of copper sulfate.
Also, in conditions of high humidity in the greenhouse, cucumbers may appear gray and white (mold) rot .
Ordinary (white) cucumber mosaic - this virus disease in the greenhouse can be determined by the yellow and white spots on young leaves with wrinkles. It leads to slow growth, poor flowering and variegated coloring of the fruit. Infected plants need to be destroyed, and the rest tied up again. For the prevention of this disease, it is necessary to carry out disinfection, observe the norms of planting density and grow more resistant varieties of cucumbers to this virus.
Fusariosis of cucumbers - this disease occurs often when grown in greenhouses. It appears yellowing of leaves when the ovary appears, then the whip withers and the lower part of the stem decays.
Control measures :
- disinfection of greenhouse soil;
- seeding of seeds with the biopreparation trichodermine (4g / kg) and its introduction into the soil;
- maintaining the correct temperature and humidity in the greenhouse;
- watering with warm water (20 ° C).
- destruction of infected bushes.
Phytophthora on cucumbers in a greenhouse is very rare, it can be determined by the appearance of green fruits of brown
Also in greenhouses on the leaves of cucumbers, diseases such as powdery mildew and brown (olive) spotting can appear, weakening plants, which can be disposed of by thoroughly disinfecting the soil and the greenhouse itself after each growing season.
Maintaining the right microclimate in the greenhouse and careful care will help to avoid any diseases of your cucumbers.