Brown-brown spots on the leaves of tomatoes: what it is and how to fight

  • Dec 27, 2019

In this article I would like to describe a few basic causes of cinnamon-brown spots on the leaves of tomatoes. Hopefully, finding out the diagnosis, you will be able to defeat the disease and save the plant.

Brown-brown, the so-called "rust" spots on tomato leaves are likely to testify about a particular fungal disease of tomatoes.

Gangrene Gangrène (brown rot)

A photo: https://otomatah.ru/wp-content/uploads/2018/07/buraya-gnil.jpg
A photo: https://otomatah.ru/wp-content/uploads/2018/07/buraya-gnil.jpg

Fungus-pathogen enters the plant through the affected tissues. Initial symptoms of infection on the leaves in the form of dark gray or brown spots with concentric dry yellow halo. The spots grow and eventually covered by a layer of very dark spores. Subsequently fungus proceeds to fruits, which causes formation of dark spots weeping. Development of the disease contributes to soil waterlogging and warm humid weather.

The sources of infection are contaminated substrate and the seed and plant remains uncleared. Therefore, the soil and the greenhouse structure should be decontaminated before sowing, the seeds etched in the future to comply with all the requirements of agricultural technology culture. Affected fundazol bushes are sprayed, screener Oksihomom or 1% Bordeaux liquid. Heavily infested tomatoes advisable to destroy.

Cladosporium (brown spot, leaf mold)

A photo: https://fermer.blog/media/res/3/7/3/8/5/37385.pkcc2o.840.jpg
A photo: https://fermer.blog/media/res/3/7/3/8/5/37385.pkcc2o.840.jpg

Externally, the disease often resembles the above Gangrene Gangrène - on leaves of tomato (first lower) appear yellow-brown spots, which are then darken and spread throughout the plant. Stains on the inner side of the sheet coated with a velvety gray bloom. Affected leaves eventually curl, dry out and fall off. Fungus-pathogen most actively distributed in greenhouses, where constant high humidity and air temperature.

Timely and disinfect the greenhouse soil, in time to remove all plant debris, etched seeds, crop rotation to respect, not "overdo it" with irrigation, with the appearance of disease-affected process tomatoes fungicides barrier, HOM, Barrier, Abig Peak etc. From folk remedies to combat Cladosporium well proven garlic infusion.

Alternaria (dry spot)

A photo: https://otomatah.ru/wp-content/uploads/2018/07/Korichnevy-e-pyatna-na-list-yah-pomidorov.jpg
A photo: https://otomatah.ru/wp-content/uploads/2018/07/Korichnevy-e-pyatna-na-list-yah-pomidorov.jpg

Another fungal disease with similar symptoms - a small well-defined gray-brown spots first cover the lower tomato leaves (mainly at the edges), then the infection spreads over the whole surface part plants. The disease can manifest itself very early - immediately after planting tomato seedlings in open ground or greenhouse, and without the adoption of measures of treatment can lead to death of plants.

At the first sign of the disease should be treated plants with a solution of copper sulfate or fungicides - INFINITY, Acrobat MC, Kuproksat et al. In order to prevent need to etch the seeds before planting tomatoes, in a timely manner to remove and burn all plant residues infected cultures, strictly observe the rotations.

Late blight

A photo: https://i.ytimg.com/vi/OKJrIwDyBdo/maxresdefault.jpg
A photo: https://i.ytimg.com/vi/OKJrIwDyBdo/maxresdefault.jpg

This is perhaps the most common disease of all vegetables, including tomatoes, especially cultivated in greenhouses. Activities fungus-pathogen seen the emergence of a vague form of large brown spots with a light edging on the leaves and stems. On the reverse side of the wafer sheet in wet weather noticeable whitish coating. The plant dries. In the future, the disease moves to the fruit, making it unfit for consumption. The disease is activated in wet weather, especially with a marked drop day and night temperatures.

Will get rid of the late blight of tomato processing plants 1% Bordeaux liquid, 0.3% th suspension of 90% copper oxychloride or corresponding fungicides - HOM, Abig Peak Speed, Revus, etc. In order to prevent before flowering plants can be sprayed with garlic infusion, a solution of iodine or Fitosporin-M. Preventive measures are also growing resistant varieties of tomatoes and timely destruction of plant residues on site.

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