Diseases and pests of violets are dangerous, first of all, for those varieties that were created as a result of breeding. They fight them with the help of special chemicals, treating both the leaves of plants and the soil in which they are planted.
The photos and descriptions of violet diseases and their pests offered on this page will help you get an idea of how they look. Also below you will learn about the treatment of diseases of violets and pest control of flowers.
Species violets, for the most part, are rarely affected by diseases and pests. More susceptible to diseases are violets created or cultivated by humans for a long time.
In order for plants to successfully resist diseases and pests, it is necessary to create their own, optimal growth conditions for each species and observe the agricultural practices of cultivation. In addition, it is very important to identify affected plants as early as possible and take measures to combat pathogens.
Diseases of violet flowers (with photo)
Below is a description of violet diseases with photographs – both common and quite rare for these plants.
Viola flower disease black skin (causative agent – imperfect fungi from the genera Fusarium, Hyphomycetas, etc.) leads to the death of seedlings and seedlings of the viola. When young plants are affected by the black leg, white spots and constrictions form in the lower part of the stem, which subsequently turn brown and rot, as a result of which the plants wither and die.
control measures. Seeds before sowing must be treated with a fungicide, sowing should be carried out only in the treated soil, when watering, add potassium permanganate to the water (the water should be light pink in color). However, it should be borne in mind that too long a solution of potassium permanganate for irrigation can lead to inhibition of plants. If, nevertheless, the seedlings began to die from the black leg, immediately remove the dead plants, reduce watering, slightly drying the top layer of soil. Sprinkle the earth around the remaining plants with dry fine calcined sand, perlite or ash. If this does not help and the death of plants continues, urgently dive the remaining seedlings into fresh soil.
Root rots are caused by a complex of imperfect fungi from the genera Fusarium, Hyphomycetas, Rhizoctonia, etc.
Most often, weakened plants are affected by root rot in winter and early spring, this is one of the reasons for the damping of plants. Under adverse weather conditions in the summer on damp, heavy soils, adult plants can also be affected by root rot.
Control measures. Creation of optimal conditions necessary for the development of this species. Species affected by root rot should not be planted in soil in which fresh manure has been introduced, as well as in places where plants affected by this disease have been in previous years.
Powdery mildew is caused by marsupials from the genera Sphaerotheca, Oidium, etc. Pay attention to the photo, this violet disease affects the lower and upper sides of the leaves, stems, petioles and buds – a white powdery coating forms on them, and then dark dots.
The disease appears in the second half of the growing season, in hot, dry weather.
control measures. Spraying with a systemic fungicide and creating good conditions for plant growth: timely weeding, loosening the soil, top dressing and watering in dry weather.
Viola rust is caused by the fungus Puccinia violae. Small, yellowish, slightly depressed spots form on the upper side of the leaves, and convex orange-yellow tubercles form on the underside of the leaf.
Control measures. Collection and destruction of affected leaves or plants in general. Removal of plant residues after vegetation or their deep incorporation into the soil. In case of damage – spraying with bayleton, benzyl, topaz, tilt, folicur preparations.
Viral and microplasma diseases are caused by various types of viruses and mycoplasmas. Symptoms can also be different: yellowing of individual shoots; twisting, wrinkling, leaf deformation; the appearance of mosaic spots and patterns of yellow, cream, bronze color; underdevelopment on shoots of buds; seedlessness. Viral diseases with certain symptoms appear most often on individual plants.
control measures. Removal of affected plants. Fight against aphids and other leaf-sucking insects – carriers of viruses.
Pests of violet flowers and their photos
The pest of violets is aphids – small translucent insects of green, black or reddish color, living on the plant in large colonies. It can attack young, tender leaves and growing points of viols, leading to leaf deformation, necrosis and death of leaves and young shoots.
Control measures. With a small lesion, aphids can be removed mechanically. With a stronger one, spray the plant with a solution of soap (better – insecticidal or household), infusion of potato tops, tobacco, or plant ladybugs or common lacewing on the plant. Apply insecticides when aphids appear in large numbers.
Thrips is a small insect 0.8-0.9 mm long, yellow or brown. Pay attention to the photo of this pest of violets: thrips forms silver spots on the leaves, then they turn brown and dry.
It affects plants (including seedlings) in greenhouses, less often in open ground in hot, dry weather.
control measures. Spraying plants with water, decoction of ash. In case of severe damage – the release of a predatory mite amblyseus on the plant or treatment with insecticides.
Slugs – in wet weather, they can severely affect the delicate parts of plants, gnawing holes in leaves, flowers, or gnawing stems. Slugs infect plants mainly at night, during the day their presence is indicated by shiny mucous stripes on the soil and plants.
Control measures. Place small pieces of boards, dense fabric, etc. near the plants, periodically collect slugs from under them and destroy them. The soil around the plants can be sprinkled with a mixture of ash and lime. Spray the plants with a suspension of mustard. To combat slugs, it is useful to place frogs and toads in the garden.
Spider mite – the leaves become whitish in color, and then a silvery spider web appears on them, on which, with a magnifying glass (and with good vision and with the naked eye), you can see slowly moving insects that look like tiny spiders.
Ticks most often infect plants in hot, dry weather. Fragrant violet can suffer greatly from the defeat of this pest.
Control measures. Frequent spraying of plants with water or tobacco infusion, with severe damage – treatment with insecticides.