2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Ring spot affects not only tomatoes - other crops often suffer from it: decorative, fruit and vegetable. You can find the ill-fated ailment on cucumbers, currants, raspberries, pumpkins, strawberries, tobacco, watermelons, grapes, zucchini, melon, as well as hydrangeas and roses. Many indoor plants are no exception - pelargonium, gloxinia and orchids can also be affected by this harmful scourge. By the way, it can attack plants throughout the growing season. With such a prevalence of destructive ring spotting, it doesn't hurt to have an idea of how to deal with it
A few words about the disease
Initially, the manifestation of the ring spot virus can be observed on the leaves. At first, light specks form on them, alternating with areas of dark green color. And some time later, spots in the form of rings begin to appear on the leaves. Often they merge with each other, forming rather bizarre patterns.
Often, ring spotting is confused with chlorosis. It differs from chlorosis in that the formation of necrotic spots slowly begins in the places of lesions, and the leaves of the tomato wrinkle and die off rather quickly. Buds on shoots with infected leaves are usually not tied.
If the ring spot attacks the whole plants, then they begin to noticeably lag behind in growth, and after some time, all the leaves die off. Deciduous plants almost always die. It happens that the ring spot gets to the fruit. In this case, the fruits become very shallow and noticeably thinned out, and also look sick and unsightly. Of course, the yield in this case drops significantly.
The causative agent of ring spot is a harmful virus that overwinters on a number of cultivated plants, as well as on perennial weeds. Crops such as lakonos, ragweed, nettles, numerous nightshade plants and various types of mint often contain the virus in their roots. And in the spring, it activates along with the juices and begins to gradually migrate to new places of its breeding.
The ill-fated virus is transmitted mainly through equipment and hands while working with infected crops, as well as with plant sap. And it is also easily tolerated by some pests (for example, nematodes, thrips, etc.).
To a large extent, the spread of this harmful misfortune is facilitated by an excessively dense planting of crops, as well as increased air humidity in combination with high temperatures. Unfortunately, often ring spotting can be detected only when the plants are completely affected by it.
How to fight
Before planting, tomato seeds are recommended to be treated with a 1% solution of potassium permanganate. More precisely, in this solution the seeds are usually soaked for thirty to forty minutes. After such soaking, they must be thoroughly rinsed with cold water. Or you can just soak the seeds for ten minutes in water with a temperature of sixty degrees. Also, before planting tomatoes, it is necessary to disinfect the soil, and not only in greenhouses, but also in open ground - this will help destroy all the viruses lurking in it.
Tomato plantings should be periodically inspected for the appearance of annular spot on them. If rather suspicious leaves are found on growing tomatoes, on which necrotic ring spots clearly appear, all infected leaves must be removed along with the shoots and burned. It is categorically not recommended to put them in compost.
All tools that were used when caring for tomatoes must be thoroughly disinfected in an alcohol-containing solution or in a solution of potassium permanganate.
Preventive treatments against all kinds of diseases and various pests will also serve well in the fight against ring spotting.
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