Causes of spots on pepper leaves
If changes occur in the appearance of the pepper bush, the culture needs treatment. Often there are spots on the leaves of pepper, associated both with a violation of the rules of cultivation, and with the development of infectious and fungal diseases.
Causes of spots on pepper leaves
In nightshade late blight - a frequent phenomenon. The peak of the disease occurs in the second part of the summer season, when sharp changes in the daily temperature begin: it is too hot during the day and rather cold at night.
The disease affects all the vegetative parts of pepper bushes, and on the foliage manifests itself in the form of large brown spots. In most cases, spots on the leaves of sweet pepper can be seen on the outside. Under the action of the fungus, a white coating is formed on the lower part of the leaf blades, which resembles a web. The result of late blight is dried and fallen foliage.
Phytophthora fungus is actively spread by spores formed on the inside of the sheets.
If brown spots appear on the leaves as a result of infection with late blight, it is recommended to feed pepper plantings with fertilizers containing potassium. Such top dressing helps increase plant immunity against late blight. Plants should also be sprayed with preparations containing copper.
Dark, practical black, spots on the leaves of pepper appear upon infection of plantings with alternariosis. This viral disease leads to the fact that the lower layer of leaves is covered with spots at the initial stage, then the foci of dark color grow and merge with each other, moving to the upper leaf layers. The result of damage to plants by dry spotting is falling leaves.
Excessive humidity, including frequently occurring mushroom rains and night dew mixed with daytime dry weather, is a provoking factor contributing to the development of alternariosis.
Create protections against dry spotting helps:
- disinfection of the soil and its cleaning from plant debris;
- treatment of plantings with antiviral drugs.
Mosaic - a dangerous viral infection that affects pepper plantings. First of all, it affects the foliage. The first sign of the development of a mosaic on pepper is the appearance on the upper side of leaf blades of light, from white to milky, spots in the form of a mosaic pattern. Subsequently, leaf blades become wrinkled.
Mosaic spreads through infected seeds, plant debris preserved in the soil, and is also carried by insects.
The disease can affect all the seedlings.
Among the effective measures to combat mosaic are:
- preliminary heat treatment of the seed material by heating at a temperature of 70 ° C or its disinfection by disinfection by sodium hydroxide with a concentration of 2% or sodium phosphate with a concentration of 10%;
- treatment of pepper plantings against insects;
- removal of seedlings affected by mosaic;
- spraying plants with preparations, among the components of which are aloe juice, chrysomal and afidol.
The causative agent of bacterial spotting is a bacterium, which primarily leads to an external change in pepper leaves. The primary sign indicating the defeat of pepper plantings by bacterial spotting is yellow and green spots on young seedlings and dark, almost black, on adult bushes.
At the first stage of infection, the foci of yellow with green are small in size, but over time they grow and become red with a brown and black tint. As a result, foliage curls, dries and falls.
The spread of bacteria occurs through damaged areas on the plant and pores on foliage and fruits. Bacterial spotting stops development when humidity drops and rarely appears in regions with cold climatic conditions.
An effective way to combat bacterial spotting is regular spraying and disinfection of seed material. Seeds can be disinfected by soaking them in solutions with any medical antibiotic or by phytolavin treatment. As a prophylaxis, to protect plantings from bacteria, they use drugs containing copper. Also, gardeners often make infusions of garlic (25 g per 5 liters of water) and spray them with plants.
Violation of mineral nutrition
The lack of some elements of mineral nutrition can also lead to spots on the leaves of pepper.
With an insufficient amount of phosphorus in the diet, the leaves become covered with dots of purple color and become wrinkled. Primary signs are observed on the lower tier of seedlings, but gradually spotting passes to the upper rows.
With a lack of nitrogen-containing components, a yellow spot appears on the foliage. Usually it hits young seedlings. Leaf blades dry, harden and fall off. Subsequently, the ovaries fall with the foliage.
White spots cover the leaves of pepper with insufficient amounts of potassium in the diet. Subsequently, white spots become yellow, starting from the edges, resembling burns. Then the spots become brown, and the leaf blade acquires a dark color.