Cucumber disease

10 years ago

last modified: 10 years ago

I am growing some cucumber plants in a box I built and am training them with a trellis. The plants are probably about a month and a half old. They were growing great until something struck them and is spreading like wildfire. The leaves are dying and have white spots and brown patches. The problem started from the bottom of the plant and has been continuing its way up. At least 90% of the leaves have the disease and it is getting to the new leaves daily. I have sprayed with "GardenSafe Fungicide 3" and that did nothing. I then made my own with water, veggie oil, and baking soda and that did not help. The leaves are dying rapidly and soon I'll be left with nothing. There is quite a bit of fruit and it they are growing well with no infection on them at all. Does anybody have a suggestion of what it is and how I can organically treat it? I grew cucumbers in this same box 3 years ago and nothing like this happened then. It is for the most part new dirt in the box as well ( a lot of compost ).

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Comments (9)

Jean
10 years ago
Doesn't look like disease to me.

What sort of fertilizer do you use? how much and how often?

And please describe your watering practices.
Jennifer
10 years ago
it looks similar to squash bug damage in my opinion
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gary
Original Author
10 years ago
@Jean fertilized when I planted, 2 weeks after planting, and then again about a week ago. This most recent one was with a different fertilizer so that could've made a difference but I do not remember if this problem was happening before I applied the new fertilizer or not. I usually water once every 3 days, sometimes 2 when it's extremely hot and the soil is dry (heat index has been in the 110's the last few days where I live.)
gary
Original Author
10 years ago
@Jean forgot to mention the type of fertilizer: The first rounds were EcoScraps organic tomato herb and vegetable. The most recent was Burpee natural & organic tomato + vegetable.
vm3y
10 years ago
Did anyone figure out the issue? I'm having the same problem.
Patti Chicago Zone 5b/6a
9 years ago
My plants are doing this same thing this year. They were growing so nice and then within a few days they look like the above pictures. I have them in a raised bed with tomato plants so I am wondering if I should pull this plant out and toss it or leave it until the fruit that are on the plant can grow until ready to pick. I have them vining up a few bamboo poles and it is working well. My plants have a few nice cucumbers on them and the lower leaves are the ones I have already pulled off. I do not want my plant to infect my tomatoes. I need the opinions of the forum here. I water well and only the bed, not the plants. The tomato plant may be crowding the cuke plant but I know its not causing the leaves to die. I have been spraying with an insecticide soap but the rain may wash that off. Should I use something stronger or just let the plant go?
farmerdill
9 years ago
Looks like Downy Mildew. If it is I know of no way to stop it once infected. Resistant varieties help as does a copper based fungicide used as a preventative. http://vegetablemdonline.ppath.cornell.edu/NewsArticles/Cuc_Downy.htm https://growingsmallfarms.ces.ncsu.edu/growingsmallfarms-downymildew09/
Patti Chicago Zone 5b/6a
9 years ago
Farmerdill - thanks for the help.
Amy (NE Ohio)
9 years ago
I have no idea, but it looks similar to angular leaf spot to me: https://www.extension.umn.edu/garden/yard-garden/vegetables/diseases-of-cucurbits/angular-leaf-spot/