Bulbous plants, including tulips, are susceptible to various diseases. Some of them are infectious in nature, that is, they are caused by fungi and viruses, while non-infectious ones are associated with the influence of unfavorable external factors. Tulip bulbs are infected both during storage and during the growing season.
To start treatment, you need to understand the causes of the disease, know its signs. Timely prophylaxis will help to avoid infection.
Fungal plant diseases account for more than 80%. The ways of penetration of infection into tulip tissues are different: through the stomata, epidermal cells, due to mechanical damage, burns. Fungal spores, mycelium particles are carried by insects, wind, water drops, and remain active in the soil, on plant residues.
The disease manifests itself in different ways - it is either a whitish bloom near the growth point and the neck of the bulb, or growing weeping areas. At first, the affected area is small, but it rapidly increases in size. A bulb infected with rot does not germinate and dies. The infection is transmitted through the soil, where the pathogen is able to remain active for five years. With high humidity, high acidity of the soil, the infection spreads at a rapid pace.
The first sign of damage is uneven germination - an infected bulb either does not sprout, or they will be very weak. Then the sprouts will turn yellow and die. Later manifestations are gray with a bluish bloom, watery formations on the shoots.
It is impossible to cure a diseased plant - it is dug up, capturing as much land as possible, destroyed, the soil under it is covered with ash. If it is not possible to transplant flowers, the site is treated with a 1.5% formalin solution (10 l / 1 m²), then tightly covered and kept under a film for three days. The same solution is used to disinfect all instruments used in containers.
Most often, weakened and damaged tissues are exposed to this type of rot. The flesh of the bulb softens, becomes dark brown, dull black sclerotia appear on it, the stem loses its elasticity, becomes brittle, the color of the flowers fades.
With a strong degree of damage, sprouts do not appear, but if they sprout, they will grow slowly. High humidity, long-term storage aggravate the manifestations of the disease. The activation of pathogens and their rapid reproduction is facilitated by the use of fresh peat, steamed soil - they do not contain natural antagonists of the pathogen.