Cucumber vine and leaves problem

Cucumber    None Given

Every year I have this problem with cucumbers, but usually it at least lets me have several cucumbers before it kills the plant. This year it kills cucumber vine already. I do not know what it is, it seems that something attacking the plan from root, since leaves are affected from bottom first and the problem moves. At first plan and its leaves look like they are not watered, and then leave drops and dries. Wine might continue to grow but very slowly.
Another problem is seems new, it is all plant leaves changes color to have many bright yellow-green spots. Tomatoes growing next to it are not affected.
Soil is mostly clay, but I plant the cucumbers in organic soil brought from Home Depot. Hopefully there is something to help this problem. My family loves cucumbers! Thank you for any advice.

Posted by: Halyna (1 point) Halyna
Posted: June 25, 2016

Dr. Ravishankar Narayana commented,
Hi Halyna, the pictures are very bright. Can you please upload new ones with less light. Thanks
almost 6 years ago.

Halyna commented,
Dr. Ravi Narayana, I provided 4 more pictures, hopefully they will help.
almost 6 years ago.


There are several issue going on with your plants. The yellow spots on the cucumber leaves (image 1) may be due bacteria, Pseudomonas syringae (angular leaf spot). The main symptoms are appearance of small, circular spots initially on leaves. This spots enlarge into angular to irregular, water-soaked areas at later stage.
It is minor disease and not effects the crop yield. Remove the infected leaves and burn them. Since bacteria spreads through splashing water avoid overhead application of water and leaf wetting.

Second issue may be fusarium wilt, a fungal disease caused by Fusarium oxysporum. The fungus is soil borne first infects the roots and then stem. The infected plant become stunted, wilt and die eventually. Generally symptoms appears on lateral vines and usually starts from the tip. To confirm the disease cut open the roots and stem to see brown discoloration of vascular tissue. Also you may see white fungal growth on this wilted vines.

Remove the infected plant and burn them. Avoid moving the soil to other part of garden. Next time grow available resistant varieties.

Posted by: Dr. Ravishankar Narayana (15 points) Dr. Ravishankar Narayana
Posted: June 26, 2016

Halyna commented,
Dr. Ravishankar Narayana, thank you for your reply. What can I do to fix this problem in the soil after I take out the sick plants? This is the only place I can use for gardening. Should I cover these land part with plastic to have sun kill all fungus? Thank you!
almost 6 years ago.

Dr. Ravishankar Narayana commented,
Yes you can sterile the soil using black plastic mulches. Dig deeply the infected area and cover with plastic mulch (http://homeguides.sfgate.com/use-blac...). Make sure you sterile all the equipments after this process. After soil sterilization you can apply biocontrol agents like rhizobacteria and plant growth-promoting yeasts to suppress the remaining fusarium in soil.
almost 6 years ago.

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