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Post  landarch Thu Jul 25, 2013 8:01 pm

My cucumbers and green beans have come down with a problem...can't tell if it's soil/ nutrient related or pest related...crispy pale leaves


Here's a shot of my cucumber trellis...leaves are turning pale an dry with only new growth is green. 
need help - cucumber pics Cuke_t10

underside with tiny bug
need help - cucumber pics Cuke_l10

new leaves flush green then start the symptom...yellowing on the edges
 need help - cucumber pics Cuke_l11

 individual leaf up close
need help - cucumber pics Cuke_l12

 same problem with green bean leaves
need help - cucumber pics Bean_l11
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Post  camprn Thu Jul 25, 2013 8:55 pm

I would have to say manganese and or iron deficiency. Maybe nitrogen. Could be your pH is off. send out a mix sample to Umass.

http://customers.hbci.com/~wenonah/min-def/beans.htm

http://aggie-horticulture.tamu.edu/vegetable/cucurbit-problem-solver/leaf-disorders/iron-deficiency/

http://soiltest.umass.edu/

http://soiltest.umass.edu/sites/soiltest.umass.edu/files/forms/soilless-greenhouse-media/Soilless%20Greenhouse%20Media%20Sample%20Submission%20Form-editable.pdf

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Post  Triciasgarden Thu Jul 25, 2013 10:37 pm

Oh wow Landarch, those look sad.  I hope you can solve the problem!  It will be a good learning experience for us all.
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Post  landarch Thu Jul 25, 2013 11:41 pm

It is sad...didn't have this problem last year and all I did was add home-made compost to the squares before planting.  The compost should be good stuff as it's made with kitchen and garden scraps, coffee grounds, shredded leaves, manures, lawn clippings, etc.  I put down an organic fertilizer a few days ago to see if that would help (Chickity Doo Doo 5-3-2).  Need to do a soil test on the Mels Mix before the fall garden goes in.
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Post  grownsunshine Fri Jul 26, 2013 1:51 pm

"Ditto" to Tricia's comment.
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Post  landarch Fri Jul 26, 2013 6:24 pm

just came back from a local garden center...spider mites.  It's a problem in our entire area...worst they've seen in over 20 years.
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Post  camprn Fri Jul 26, 2013 6:43 pm

landarch wrote:just came back from a local garden center...spider mites.  It's a problem in our entire area...worst they've seen in over 20 years.
Woah! Shocked 

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Post  sanderson Fri Jul 26, 2013 9:25 pm

The only spider mite situation I have been exposed to was told to me by someone who gave me some leftover wire garden mesh (like for supporting around tomatoes, circling a compost pie, etc.)  They got the wire from someone in No. California who was growing a "specialty crop."  Long story short, the "crop" got stressed and was taken over by spider mites.  That in turn, reduced the value of the crop.  Does that make sense??  I guess they are really bad?  Will have to research.  Okay, now that I have written the words 'spider mite,' I am sure I jinxed myself and will now suddenly find SM in my garden. need help - cucumber pics 3555472862
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Post  boffer Fri Jul 26, 2013 10:52 pm

sanderson wrote:...Okay, now that I have written the words 'spider mite,' I am sure I jinxed myself and will now suddenly find SM in my garden. need help - cucumber pics 3555472862

I took pictures this AM of some my cukes that I thought looked like landarche's.  But I don't think I'll post them-I don't want to jinx myself either! Razz 

(on second thought, my problem doesn't resemble hers at all! Wink  )
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Post  unit649 Sun Jul 28, 2013 9:52 am

landarch, I am glad that you posted this.  I had one yellowish leaf on my cucumbers, near the ground.  After seeing your pictures, I looked more closely and I believe that I have the same problem.  

Like boffer said, I don't want to jinx my little babies, but looks like it is spreading, so I better do something now.  

What did the garden center recommend for spider mites?

Madge
need help - cucumber pics Imag1112
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Post  landarch Sun Jul 28, 2013 8:23 pm

they recommended Neem Oil...and you can shake the leaf over a sheet of white paper and see the tiny, tiny mites crawling around if you actually have them.

Neem Oil once ingested makes the mites stop feeding...and I think they just starve to death...and if the eggs are sprayed I think it smothers them.  They recommended spraying every 5 days or so.  One spray bottle was around $13...so it may get expensive just to save a few of my vines...both sides of every leaf should be sprayed.
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Post  unit649 Sun Aug 18, 2013 3:01 pm

landarch, I was wondering if you were able to save your plants.  I tried the home remedy solutions, baking soda solution, and then DE.  They seamed ok for awhile, even got about 25 large cucumbers.  But now it looks like this same plant is dying, and the 2nd plant is starting to look the same.  If the neem helped you, I will try it.  I have so many baby cucumbers on this vine, I want to save them if there is a way.Sad 
Madge

The plant on the left is first and worst affected.  But now the healthy one on the right is also showing the same symptoms.
need help - cucumber pics Imag1615

I pruned away a lot of the dead leaves, but there is still some pretty cukes.
need help - cucumber pics Imag1616

I don't think the small one in the back is going to make it, as it is yellowish looking.
need help - cucumber pics Imag1617
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Post  camprn Sun Aug 18, 2013 4:31 pm

unit649 wrote:
need help - cucumber pics Imag1615


this looks a lot like downy mildew to me.............

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Post  camprn Sun Aug 18, 2013 4:37 pm

unit649 wrote:
need help - cucumber pics Imag1112
The chlorosis seen in this photo may be due to iron defeciency......... or not. Did this same type of yellowing pattern persis over the past several weeks?

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Post  unit649 Sun Aug 18, 2013 6:18 pm

campern,
Thank you for answering.  I don't see any mildew. I have powdery mildew on my cantaloupe. Is that the same as downy mildew?

The first pic above, was the first sign of the problem.  It has just gradually escalated up the vine.  And now to the second plant, that is beside it.
Madge

Here is a pic from Aug 1st, showing only the first yellowing leaves, in the bottom right corner and the deep green of the other leaves.
need help - cucumber pics 20130816
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Post  camprn Sun Aug 18, 2013 6:38 pm

Powdery mildew and downy mildew are two distinct diseases.

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Post  unit649 Sun Aug 18, 2013 8:02 pm

Thanks again campern, reading up on it now.
Madge
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Post  WriterCPA Sun Aug 18, 2013 8:36 pm

Landarch,

Looks like a mix of powdery mildew and a mosaic virus. I've brought back my beans, cukes, and pumpkins with some spread to my beets. Over the last two weeks I've had wonderful revival with new growth on the plants.

I gave daily treatments of 2 oz of 3% hydrogen peroxide (from the drug store) in one gallon of water using a hand sprayer for a week. Now I do treatments about every third day and after rain to keep things under control.

There are several good threads discussing hydrogen peroxide (just search on peroxide). In one or two of them I put in some scientific literature on using H2O2. I'm leery of using the 35% hydrogen peroxide Food Grade. This is nasty stuff I only would use under a fume hood in a chem lab, along with heavy gloves and goggles. By the time you get it diluted, it's down to the same thing as starting with the simpler and safer 3% grade. Food grade is for sterilizing food packaging. You don't want a sterile garden, microbes are essential to proper plant growth.
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Post  unit649 Mon Aug 19, 2013 12:07 am

Maria, thank you. I will try the peroxide mix tomorrow, I have used it before on other plants.  I will do a search for the mosaic virus.

I went out and cut one of the leaves to get good pictures.  While taking the pics, I found a tiny green worm thing.  Plus I think a flea beetle.  And one that I do not know.  All on one leaf.
I did not see anything that looked like the downy mildew.  There is a bit of the DE white powder still on the leaf.
Madge
front of leaf
need help - cucumber pics 20130818

back of leaf
need help - cucumber pics 20130819

unknown critter
need help - cucumber pics 20130820

flea beetle on right
need help - cucumber pics 20130824

green worm
need help - cucumber pics 20130822
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Post  WriterCPA Mon Aug 19, 2013 12:46 am

Apparently the mosaic virus, which looks like what you have, is carried from plant to plant by aphids.

http://images.search.yahoo.com/search/images?_adv_prop=image&fr=chrf-ydwnld&va=mosaic+virus+cucumbers

I did find one positive reference to treating mosaic virus with hydrogen peroxide, along with my own experience.  I won't call it a cure, but the Dirt Doctor seemed very positive.

http://www.dirtdoctor.com/Hydrogen-Peroxide-Newsletter_vq2387.htm

I tore out my most affected plants, but others have recovered.  The general rule is to tear out all of the plants.  So late is the season, I'd say reach for the brown bottle and pray.
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Post  sanderson Mon Aug 19, 2013 2:25 am

Unit,  The green hairy caterpillar is interesting.  Is it one of the poisonous or irritating types?
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Post  camprn Mon Aug 19, 2013 7:26 am

Madge, have you tried contacting your local Extension Service for their help? We can keep guessing what the troubles are, but they can actually ID what the troubles are and give you advice on treating it appropriately.

http://ces.ca.uky.edu/ces/

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Post  landarch Mon Aug 19, 2013 9:24 am

Yes, I was able to save my plants from the spider mites...I applied Neem Oil right before going on vacation in early August and when I came back a week later the vines looked 100% better.  We did receive tons of rain and very cool temps (70's which is extremely cool for KS in august) while I was gone.  Now my vines are dying from the wilt virus...and the variety County Fair that is wilt resistant, develops tiny cucumbers that just dry up and form nothing.  The base of my vines have been stripped of the green outer layer and are all scarred brown...I think the rolly-pollies have been eating the base.  Anyway, I think I can harvest at least some more cukes before October frost.  I'll try to post a follow-up pic this evening.
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Post  camprn Mon Aug 19, 2013 10:10 am

If the baby cukes are drying up and falling off, this sounds like you may be having pollination troubles. Are you seeing bees?

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Post  unit649 Mon Aug 19, 2013 2:14 pm

Just came from the County Extension Office.  The problem with my cucumbers is bacterial Anthracnose.  They recommended sulfur.  I know there has been discussion on here about sulfur.  So what do you all think.
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