Purple leaves in tomatoes: causes and methods of treatment


Violation of the technology of growing garden crops under the conditions of home gardening often causes a change in the appearance of plants and a significant decrease in yield. A symptom of the disease is often a change in the color of the foliage. In tomatoes, purple leaves are quite rare, however, this problem requires increased attention and the use of the correct treatment or prevention regimen.

Botanical features of the culture

To understand why a tomato has purple leaves and what to do if seedlings develop very poorly or do not grow at all, you need to know the botanical features of tomatoes and be able to distinguish the physiological state of the plant from the symptoms of disease damage.

Tomato or tomato (Solánum lycopérsicum) belongs to the herbaceous plants of the Solanaceae family, which are widespread in our country. This tasty and healthy vegetable crop has the following characteristics:

  • strongly developed root system of the rod type;
  • branched, well-forming and fast-growing roots;
  • deepening the roots of seedlingless tomatoes per meter or more;
  • the diameter of the root system is about 1.5-2.5 m;
  • propagation of culture by seeds, cuttings and stepsons;
  • a stalk of an erect or lodging type, with branching, with a height of 30-200 cm or more;
  • foliage, dissected in large lobes;
  • flowers of small sizes, painted in various shades of yellow, collected in a brush;
  • the fruits are juicy multi-nested berries that vary in shape, size and color.

Seedlings of tomatoes: problems with growing

In home gardening, cultivation of non-standard and standard varieties of tomato is practiced.

Growing problems

If the leaves or other aerial parts of the tomato have become different from the color stated in the varietal description, it is necessary to determine the cause of this phenomenon as soon as possible and choose the most effective way to rid the garden crop of the problem.

Purple leaves

Orange-violet or pale leaves with a violet tint appear on tomato bushes not too often. The most common causes of this occurrence are as follows:

  • lack of nutrients, namely phosphorus;
  • non-compliance with the temperature regime.

As a rule, such physiological conditions adversely affect yield indicators, but do not cause the death of a vegetable crop.

Violation of staining of tomato seedlings

It should be remembered that there are several varieties of tomatoes in which, at the stage of formation of the first leaves of seedlings, a purple hue appears on the veins or on the leaf plate itself from the bottom of the stem. A striking example of this variety is the tomato "Good", the leaves and stems of which at the seedling stage acquire a delicate violet-lilac color.

There are several external reasons for the color change, including growing seedlings in a too cold soil substrate, as well as low air temperature or insufficient amount of phosphate fertilizers. If measures are not taken in a timely manner, tomato seedlings will be too weak, often ill and poorly adapted for planting in a permanent place. Also, productivity indicators of garden crops are significantly reduced.

Fruit color change

In recent years, it has become fashionable to grow tomatoes in the home gardening, forming the fruits of unusual coloring. Ripe tomatoes of these varieties can be not only red, pink, orange and yellow, but also purple.

Among these varieties, for example, is the tomato, well-known to foreign and domestic amateur vegetable growers "Cherokee purple heart" or "Cherokee Purple Heart", bred by American breeders. The purple pigment called anthocyanin contained in the ripe fruits of this variety is a powerful antioxidant that helps in the fight against cancerous tumors and cardiovascular diseases.

There are a number of pathological conditions that cause a change in staining of the fruit at different stages of ripening. If we are not talking about varieties artificially enriched with anthocyanins, then you should pay attention to neighboring cultures. Quite often, a purple hue on tomato fruits appears as a result of pollination with eggplants growing in the immediate vicinity.

But if the fruits acquire not just purple, but almost black staining, this may indicate damage to tomato bushes by such rather dangerous diseases as late blight or apical rot.

Methods of treatment and prevention

Depending on what caused the purple color of the aerial parts of tomato bushes, the following measures may be required:

  • the application of phosphorus-containing fertilizers in the cultivation of tomato seedlings;
  • temperature regulation in the room for growing seedlings or adult plants to indicators of at least 18-20 ° C;
  • proper preparation of the soil for planting with a deep digging in the autumn period and the application of organic matter, as well as mineral fertilizers at the rate of 7 kg of manure, bird droppings or compost and 40 g of superphosphate per square meter of planted area;
  • spring digging and processing of greenhouse soil with the addition of 25 g of superphosphate and 20 g of potash fertilizers to each square meter of the landing area;
  • top dressing of tomato seedlings planted at a constant place a couple of weeks after planting with organic mineral fertilizers in the form of manure and superphosphate dissolved in warm water;
  • mandatory two main root dressings of tomato bushes at intervals of a couple of weeks with solutions based on 20 g of superphosphate, 15 g of potassium salt and 10 g of ammonium nitrate, diluted in a bucket of warm water.

For irrigation, it is necessary to use warm water, heated during the day by the sun's rays, irrigating directly to the root system and preventing water from entering the aerial part of the plant.

Brown spotting in tomatoes: treatment

Thus, in order to get strong and most productive plants, it is necessary to periodically inspect seedlings and tomato bushes, as well as to control the temperature and observe the rules of agricultural technology for growing vegetable crops.



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