These plants (Squash and cucumbers were planted 2 weeks ago. I can not believe the growth. Suddenly the leaves are beginning to develop brown spots. Any idea what is happening? The containers are self-contained but I did mix a slow release fertilizer rather than use the 10-10-10 strip.
Disease or deficency ?
I hope you get an answer soon, because my cucumbers are doing the same thing, planted in coir with the fertelizer strip.
Are you seeing anything on the back of the leaves? This could be some type of sucking insect. Spider mites and white flies can do this sort of damage.
Mine do the same every year, it's mainly on older leaves and never on the new foliage. Never have figured it out. It doesn't seem to slow down production at all. I just remove the bad leaves.
Here's a link of Cucumber diseases that might help... http://vegetablemdonline.ppath.cornell.edu/factsheets/Cucurbits_Foliar.htm
If the spots or patches are crisp and brown, underwatering is the most likely cause. If the area is soft and brown, overwatering is the probable cause. Watering during strong sunshine can cause something similar too. Beads of water form a magnifying glass for the suns rays and burns spot s on leaves. And that is my learned opinion...........well.........actually it came straight out of the book. :-)
You all made me go outside and check on the Lemon Cucumber =).
Thanks for posting your question!
One more other thang............you notice in Ray's post above, he said it the spots showed up on the older leaves only and not on the new leaves. Thats what made me think it was a temporary over/underwater deal that didn't seem to really do much harm to his plants in the long run.
Thanks for the info Jay. Since it doesn't take over the plant, I've ruled out disease awhile ago. I just figured it's what cucumbers do and their older leaves just die off eventually, kinda like my squash does. The leaves do get very dry and brittle. Mine are in an EB so it's curious if over/under watering is my problem. With your info, I'm thinking our heavy morning dew and morning sun could be causing it. I've been picking a lot of nice cukes all week, so production is still good.
I have always had a hard time trying to figure our whats going wrong with my plants. My best books on the subject, with good explanations and pictures (I like pictures) are written by D.G.Hessayon who has written a series of "Expert" books. The two I have are "The Container Expert" and "The Greenhouse Expert." The Greenhouse Expert seems to have a little more extensive information on diseases and problems and has one whole page on Cucumbers.
Ray, like you my first thought was that over/underwater made sense but how could that be true with self contained methods of growing? I had decided I would try allowing most of my water to be used before I replenished water supply, which I may still try. Your theory "heavy morning dew and morning sun could be causing it" very well describes conditions here currently. I am encouraged that none of you feel that production suffers. This is my first attempt at self contained gardening with anything but tomatoes. I am thrilled with results so far, but very pessimistic about any little negative aspect !! . LOL