Diseases of cucumber, pumpkin, zucchini and patisson
Jun 30, 2018
Anthracnose is expressed in round, slightly blurry spots on the leaves of plants planted in a sheltered soil. Stains, increasing, merge, covering a significant part of the plate of the leaf, giving it a burned appearance. Then the leaves turn brown, dry up and crumble. On whips and stems mucous orange pads are formed. Control measures. Compliance with fructification and destruction of post-harvest residues;Treatment of greenhouse frames and wooden parts of greenhouses with gray colloid( 40 g per 10 liters of water).When the first signs of the disease appear, the plants are treated with homo( 40 g per 10 liters of water) and 1% with a Bordeaux mixture( 100 g per 10 liters of water).
Powdery mildew affects leaves and stems from the moment they grow back, they look chloro-like, underdeveloped and even die. On the old leaves, rounded white spots appear on the underside, the number and size of which gradually increase, they merge. The leaves become light or yellow-green, wrinkled and darkens.
False mildew often infests cucumbers during fruiting. On the leaves appear greasy green spots, the leaves brown and dry up. Infection persists in the soil up to 6-7 years. Control measures. Cessation of irrigation, later spraying with topaz and chom, alternation of cultures.
White rot affects all the organs of pumpkin plants, manifests itself in the form of a white flocculent deposit, on which black dots subsequently appear. The tissues of the plants become soft and mucilage, the plant fades, and then perishes.
Control measures. Alternation of crops. Placement of cucumber after legumes, onions or cabbage;treatment of diseased areas with crushed charcoal, lime-lint or chalk.
Fusarium wilt - various types of soil fungi affect cucumber plants of any age. The seedlings wither on the shoots, the upper part of the stem and root rot. On the lower leaves spots are formed, the tissue of the leaf begins to die off, and the leaves of the upper tiers become pale. At the base of the stem, white fluffy deposits can sometimes be found.
Control measures. Use of healthy seeds with mandatory dressing before sowing in a 1% solution of potassium permanganate;alternation of crops;thorough loosening of the soil.
Ascohitosis affects the leaves and stems of plants grown in sheltered soil. Symptoms of the disease are observed in the nodes of the stem, on not completely removed petioles of leaves and shoots, then spread up and down the stem. Serious spots with numerous black dots form on the affected areas. There is also a disease of the leaves, beginning with the lower, weakened and least illuminated, in the form of chlorotic spots with a large number of black dots.
Control measures. Replacement of contaminated soil;disinfection of seeds before planting;compliance with the optimal regime for growing plants;Treatment of plants before flowering with colloidal sulfur( 40 g per 10 liters of water).
Brown, or olive, spotting caused by the fungus, manifests itself in lowered night temperatures and high humidity, more often in sheltered ground. Symptoms of the disease are observed in the form of numerous rounded brownish spots with a light center and a light border on the leaves. The spotting also appears on the petioles of leaves, stems and fruits in the form of small watery spots, which rapidly increase, the peel is cracked, gelatinous drops appear on the surface. Later the spots are covered with dark velvety mold, instead of them ulcers are formed. Control measures. Respect for crop rotation;replacement of soil;at the appearance of the first signs of the disease spraying of plants 1% - Bordeaux mixture( 100 g per 10 liters of water) or homo( 40 g per 10 liters of water).The treatment is repeated after 10-12 days.
Bacteriosis, or angular spotting, is common in cucumbers grown in sheltered soil, affects all organs of plants. Symptoms - light brownish spots on the cotyledons, greasy angular - on the leaves, which gradually darkens and wither. Affected tissue falls out. In place of dried oily spots, ulcers are formed. On sick organs of plants appear sticky droplets of turbid yellowish liquid. When dry, they form a film. Control measures. See Brown Spots.