2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Cucumber bacteriosis develops best at fairly high humidity. Sometimes this disease is also called angular bacterial spotting of cucumber leaves. In addition to cucumbers, such a dangerous ailment can also attack watermelons with melons. At the same time, it does not matter at all whether all these crops grow in protected ground or in the open. Quite often the shortage of the cucumber crop can reach fifty percent. Infected cucumbers lose not only their commercial qualities, but also their ability to be stored and transported optimally
A few words about the disease
Quite angular spots appear on cucumber leaves when affected by this ailment. At the very beginning of the development of bacteriosis, they are oily, and then, after some time, they turn brown and dry out. And in the center of the specks on the leaves, numerous holes are formed. Often this leads to a suspension of the growth of cucumbers, as well as to the fall of the leaves.
On the undersides of infected leaves, in wet weather, cloudy yellowish specks consisting of accumulations of harmful bacteria can be seen. And in dry weather, they look like a whitish bloom.
On young cucumbers, holes are formed with dried edges. One gets the impression that they were pecked by birds. The tissues in the affected areas become corky, and the growing fruits become ugly and curved. If the cucumbers have been severely affected, bacteria that penetrate the seeds are retained both on their surface and in the inner layers of the shells.
On numerous ulcers, pathogens of rather harmful soft bacterial rot sometimes develop as a secondary phenomenon, provoking rotting of the whole fruit. In general, this can be encountered in high humidity conditions in greenhouses.
The causative agent of this disease is pathogenic bacteria. The spread of bacteriosis of cucumbers occurs with plant debris or seeds. Harmful bacteria infect the cotyledons, and from the cotyledons, the infection subsequently spreads to the real leaves. During the growing season, dried parts of dead plants or infected cotyledons can be carried by raindrops, as well as insects or wind. The harmfulness of bacteriosis is almost always directly dependent on which parts of the plants were attacked by the disease, as well as at what stage their defeat occurred.
How to fight
Cucumber seeds for subsequent sowing should be taken only from healthy plants. And even then, pre-processing will not hurt them. As a rule, seeds are disinfected chemically or thermally. And it is possible to reduce the spread of bacteriosis along with the degree of its development by soaking the seeds for twelve hours in solutions of various microelements (boron, iron, zinc, manganese, copper) at a concentration of 0.03%. It is extremely important to follow the rules of crop rotation when growing cucumbers.
The selection of varieties resistant to bacteriosis will also serve well. The least affected by this ailment are such varieties as Phoenix, Drop, Competitor, Othello F1, Eliza F1, Harmony F1, Angelina F1, Koni F1, Amur F1, Masha F1 and Dzherelo.
In protected ground, it is imperative to carry out various sanitary and preventive measures: disinfect the soil or replace it, thoroughly clean the greenhouses from vegetation residues, disinfect greenhouses and hotbeds, as well as all used equipment.
All vegetation, especially in wet weather, is recommended to be sprayed with 1% Bordeaux mixture. Such spraying will not harm young seedlings.
In the fight against all kinds of diseases of cucumber, including bacteriosis, a drug called "Fitosporin" has proven itself excellently. With the observance of a two-week interval, it is used to water the leaves. Also, to combat bacteriosis in protected and open ground, the means "Abiga-Peak" and "Kuproksat" are used, and Fitolavin-300 will be especially suitable for protected ground.
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