Tomatoes: How To Diagnose A Spot

2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38

The process of harvesting ripe tomatoes will be in full swing very soon. Summer residents are already in anticipation of a rich harvest, because the seedlings were a success! But what is this black bloom on the leaves, which became noticeable only on the beds? And where did this brown coloring of greenery come from? What's wrong with tomatoes and how to save your plantings?

Whitefly and Rusty Mites Can Leave Crop

Such a parasitic insect as a whitefly is dangerous for tomatoes in all phases of its development. Already at the stage of flat, pale green larvae, they tenaciously grab the leaves, drawing life-giving juices from them. These pests are easy to recognize by the characteristic black bloom that appears as a result of their vital activity. Having eaten on your beds, they leave behind a sticky discharge, where favorable conditions are created for the development of another trouble - a sooty mushroom. He then gives a black color to the feces of the larvae. To get rid of the whitefly, it is recommended to spray the plants with actellic solution during the growing season of the tomato.

If the leaves and other parts of the plant acquire a brown or rusty hue, one can suspect this is the harmful vital activity of a rusty mite. Other symptoms that will help to establish the correct diagnosis of the affected plantings are leaf falling, cracks in the skin, hardening of the tissues of the ripening fruit. The tick spreads very quickly, and if measures are not taken to combat it in a short time, it will soon seize the territory with peppers and eggplants, and settle on potatoes. In a difficult battle with a pest, such drugs as rovikurt and karbofos will become your faithful helpers.

What will stains on tomatoes tell you about?

The most dangerous infection for nightshades is late blight. On the leaves, late blight is manifested by discoloration and wilting, and later - brown dark spots. Also, the fungus makes itself felt with a white bloom on the sheet apparatus, it becomes noticeable with high humidity. Fruit damage is manifested by the formation of a hard dark spot, from which the disease penetrates deep into the tomatoes.

Phytophthora prevention is carried out even before sowing the seeds and during the care of the seedlings. The conditions that lead to disease must also be remembered in the process of planting tomatoes in the ground. These include thickened plantings, placing tomatoes after other nightshades, infestation of the site with perennial stubborn weeds.

To protect tomatoes from fungus will help the introduction of phosphorus-potassium dressings. During the period of fruit setting, it is recommended to treat the plants with garlic infusion. If signs of phytophthora are found, copper-containing preparations should be used - Bordeaux liquid, polycarbacin. Stop spraying 3 weeks before harvest.

Brown leaf spot can be mistaken for phytophthora. With such a lesion, a light mushroom bloom also appears on the underside of the leaf. But on the reverse side, the spots have a yellow tint. If you let the disease take its course, the color of the affected area turns brown, a velvety layer will be visible on it, and then the leaves will dry out altogether. Most often, the disease occurs during the flowering period of plants.

For preventive purposes, it is necessary to regularly ventilate plantings in protected ground. Another factor that contributes to the development of infection is temperature drops. The diseased parts of the plants must be removed in a timely manner, and the tomatoes must be treated with copper oxychloride once every one and a half weeks.

A macrosporiosis signal will be a round brown pigmentation on the leaves and stems. The spots grow in size and merge with each other. The disease also affects the fruit. To combat it, the same drugs as against phytophthora.