2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
English, or green speckled mosaic is characterized by a highly specialized pathogen virus and is found mainly in protected ground. This is what makes it different from an ordinary mosaic. Weak deformation of the leaves, their mosaicism and slight lightening of the veins - these are the main symptoms of this ailment. In order to save the harvest of crispy cucumbers, it is important to identify the ill-fated attack in a timely manner and get rid of it in time
A few words about the disease
The first symptoms of this disease can be found on young plants twenty to thirty days after the cucumber seedlings are planted in a permanent place. Most often this happens when the air temperature rises sharply to thirty degrees.
On the plants attacked by the English mosaic, the development of reduced wrinkled leaves begins, and the number of female flowers, as well as of fruits, significantly decreases. Those fruits that have already set are characterized by slow development, acquire a mosaic color and are deformed. And in general, their quality deteriorates markedly.
The alternation of light green areas with dark green ones with the defeat of the English mosaic is quite clearly expressed. A particularly vivid manifestation of mosaicism can be observed in the case of a lesion of cucumbers with a white strain of the virus - only areas along the veins remain green, and all other parts of the leaf blades are strongly discolored. Fruit on infected plants is also characterized by a rather uneven color.
The causative agent of the infection is a harmful virus that has incredible resistance to the action of even the most extreme environmental factors - its viability remains when frozen, dried, and even when heated to 90 degrees. On dry leaves, the pathogen can persist for a year. And this virus usually infects a fairly small number of cultures. Typically, it is only found on cucumbers, watermelons, and melons. At the same time, he was not noticed on zucchini with pumpkin.
Sources of destructive infection are plant debris, soil and seeds, and in the seeds, viruses can be deployed both in the embryos and in the skin. And secondary infection can easily occur if contaminated juice gets on healthy crops. This usually happens during fruit collection. In principle, infection is possible even with the usual contact of healthy crops with infected ones. And viruses can also be stored in the inventory in a dried form. As for the reserve plants, these are the representatives of the pumpkin family.
How to fight
When planting cucumbers, it is recommended to give preference to resistant hybrids (F1), such as Pasalimo, Pasadeno, Pasamonte, as well as Octopus and Ofix. It is equally important to strictly observe the rules of crop rotation.
The cucumber seeds used must be free of infection. It is noteworthy that in those seeds that have been stored for two years or more, the infection is significantly reduced.
It is useful to carry out thermal disinfection of seeds before sowing. It is carried out according to the following scheme: first, for three days, the seeds are heated at a temperature of about seventy degrees, then for another three days they are heated at a temperature of fifty to fifty-two degrees, and finally the seeds are heated again at a temperature of seventy-eight to eighty degrees. throughout the day. Such a procedure contributes to the complete release of the seeds from the infectious agent.
The spatial isolation of all kinds of pumpkin crops from each other helps to reduce the spread of harmful scourge to a considerable extent. Seedlings are often vaccinated with Virog-43. And the spread of the English mosaic helps to limit spraying with solutions of trace elements or a 10% solution of skim milk.
Also, with the permanent cultivation of cucumbers in greenhouses, the soil in them should be systematically replaced and disinfected.
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