Cucumber diseases and their treatment

Today we're covering an important topic: cucumber diseases, leaf photos, and treatment. It's crucial to understand which conditions are fatal to cucumbers, which will result in a good harvest, what to do when certain symptoms appear, and what preventative measures will save our harvest and keep our cucumbers from going to waste.
But you can't live on cucumbers alone, look: Planting potatoes under straw — growwise-en.techinfus.com.

Powdery mildew

This is probably the most well-known cucumber disease affecting greenhouse plants. Initially, a white coating appears on the underside of the leaves, followed by white spots on the leaf tips, which then darken, the foliage falls off, and the plant dies.

How to combat: Remove affected leaves immediately as soon as you notice signs of powdery mildew. To avoid chemicals, you can use folk remedies like marigold infusion (many gardeners plant these flowers with the first rays of warm sun; they also repel many pests). Horsetail is also good if the disease is just beginning to appear.

If powdery mildew has already invaded your cucumber patches, you'll need to resort to more effective treatments: Topaz, Paracelsus, and Switch and Horus are also effective. For prevention, it's good to use phosphorus and potassium, which will strengthen the plants. Pre-treatment with Trichodermin is also recommended, and you can also use Fitodoctor. With these measures, your cucumbers will definitely be immune to this dreaded cucumber disease.

Our readers also recommend using a plant growth activator to prevent many diseases, which protects plants from harmful fluoride.

Downy mildew

An equally serious enemy of your cucumbers, yellow spots appear on the leaves all over the place, eventually turning purple. The foliage then begins to curl upward, dry out, and die.

Causes of occurrence:

• pathogens could well have remained on the winter remains,
• Also, sharp temperature changes contribute to this disease, low daytime temperatures, below 20 degrees.
• Violation of crop rotation - cucumbers need to be rotated in sections, returning them to their original location only after 4 years.

PreventionRegularly inspect cucumber vines, and if you notice any disease, take immediate action. Copper-containing products and fragicides are useful in this case. Quadris is a good choice for the latter, as is Aliette. Ridomil Gold and Topsin are also helpful.

Treatment:
• If powdery mildew has struck your greenhouse, the best measures are to raise the temperature to 20°C or higher, remove excess moisture, and avoid watering with cold water. Incidentally, cold watering can also lead to a number of other diseases.
• mix 2 ml of Topaz in a bucket of water and spray the cucumbers.
• Pour 40g of HOM into a bucket of water, stir and spray on cucumber vines.

Folk methods for combating powdery mildew in a greenhouse:

— mullein infusion: 1 kg/3 days of water, leave for 24 hours, pour in 3 liters of water, spray the plants.
- Pour a liter of milk into a liter of water, strain, and spray.
Mix 50g of baking soda and laundry soap, pour into a bucket of water, and spray. Repeat this process once a week until you achieve consistent results.

After harvesting, be sure to disinfect both the soil and the walls of your greenhouses. Be sure to warm and disinfect seeds before planting, as seeds are often the source of disease.
See also: Growing cucumbers in open ground in the Moscow region.

Bacteriosis

This disease is also called angular spot, because it affects the corners of the plant, becoming covered with an oily coating. In greenhouses, this disease most often affects cucumbers, causing the fruit to become distorted and covered with ulcers.

Preventive measures: mandatory soil renewal, purchasing healthy seeds and/or disinfecting them, treatment can be done with Bordeaux mixture, a one percent composition.

Gray rot

When the temperature outside or in the greenhouse is 17 degrees Celsius or even lower, when the humidity is high, when the plantings are dense, and you're watering your cucumbers with cold water—that's when gray mold begins to rage. A nasty gray coating, slippery and disgusting, appears on the stems, and immediate action is needed.

- cut off all areas where gray mold has already settled
- trim the shoots, hang them less frequently, avoiding thickening, and apply (if these measures do not help) the Switch preparation.

White rot

Cucumbers are primarily affected by this fungus, which begins as white mycelial spots on the leaves, then darkens, and the cucumbers themselves become watery and unpleasant-tasting.

Treatment: Trichodermin, Switch, you can also use Rovral and Sumilex.

Ordinary mosaic

Cucumbers grown in open ground, where ants and, consequently, aphids, whose sap they feed on, are particularly susceptible. Aphids often carry the disease. They can also easily survive the winter in weeds.

The first signs appear on seedlings as mosaic-like leaves, distortion, and wrinkling. On mature plants, warts appear on the foliage, variegated spots appear on the fruit, and cucumbers become distorted.

PreventionCrop rotation is essential, and timely removal of weeds, cut branches, and leaves is essential. It's best to choose varieties resistant to mosaic, such as Pasadena or Othello.

White mosaic

The leaves begin to wrinkle and become covered with light spots.

Cause: crop rotation violation, infected seeds.
Prevention: choose resistant varieties, treat seeds, preparing them for planting.
Treatment: removing damaged leaves.
Take a look: Cucumbers in a barrel - Ganichkin's cultivation.

Fusarium wilt

This harmful fungus often attacks greenhouse cucumbers. It manifests itself as wilting of the shoots, starting at the tips and progressing to the root system.

Reasons: high humidity, contaminated soil and seeds.
Prevention: healthy seeds, seed treatment, soil disinfection in the greenhouse, watering with warm water, optimal humidity.

Olive spot

The correct name is cladosporiosis; the virus appears on the fruits, most abundantly towards the end of summer.
Causes: high humidity, drafts, and temperature differences between night and day. The foliage becomes covered in spots similar in color to olive oil, and the leaf edges turn yellow. There are ulcers on the fruit, and a web-like mycelium under the leaves.

PreventionDisinfect everything in the greenhouse, including any ropes and trellises left over from summer, and completely disinfect it in the fall. Avoid temperature fluctuations and high humidity during cultivation.

Root rot

The foliage begins to wither and dry out, and the roots, if you remove damaged plants, become rotten and have a reddish tint - this is root rot.

Reasons: high, excessive temperatures, insufficient watering, or, even worse, watering with cold water.
Prevention: do not thicken, be sure to observe crop rotation, returning cucumbers to their former place no earlier than after 4 years, treat with Previkur.
TreatmentStimulates the formation of new roots in cucumber vines. To do this, add fresh soil to a depth of about 5 centimeters under the roots and water the area around the roots with warm water.

Anthracnose

It is also called copperhead and appears as brown spots and wet ulcers on cucumbers.
Causes: infected seeds, fungus persisting in weeds left over from summer, failure to maintain crop rotation.

Treatment: 1% Bordeaux mixture, which should be sprayed weekly on diseased bushes, copper sulfate (0.5% solution), and charcoal dusting.

Spider mite

To prevent this pest from damaging your crops, remember to practice crop rotation, remove all weeds and not leave them in the beds, providing shelter for the mite and its offspring, do not overcrowd the plantings, and monitor the humidity.

Tick ​​control:

• Plant-pin will be very helpful if you have cucumbers in a greenhouse.
• Actofit – in addition to greenhouses, also helps cucumbers grown in open ground.
• Etisso is very active, good for greenhouses, and actively destroys spider mites.
• Fitoverm is a good drug that effectively fights ticks, but it is addictive and needs to be alternated with others.

Why do leaves turn yellow?

An important question that every gardener often asks themselves when trying to find the causes. These could be:
1. potassium deficiency – feed with an infusion of ash and onion peel;
2. temperature changes - cover the cucumbers at night;
3. Olive mosaic - read above.

See also: When to dig up carrots and beets in the Moscow region.