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Kalamazoo, MI (Jpwrhse@charter.net)

As many questionable things as I'm am doing this year I was bound to have a problem eventually. I just submitted a couple of pictures to my diary (probably not available until tomorrow). Browning then dying leaves, first by the leaf's veins and edges eventually whole leaf will die. These leaves are near the stump. Also yellow spots on several leaves 10 foot down the vine. What could it be? I sprayed bifenthrin about 5 days ago for SVB, found out it also would take care of my Cuke beetles and if I had them spidermites. I treated with tebuconozole tonight in case of powdery mildew or a fungus problem. I am burying vines and growing out over grass. Any help?

7/17/2006 7:10:55 PM

Danville, CA (petman2@yahoo.com)

Got any pics of the underside of the leaf?

7/18/2006 2:03:12 AM

Kalamazoo, MI (Jpwrhse@charter.net)

I just posted a couple pics of the undersides to my diary and emailed them to you.

7/18/2006 8:47:18 AM

Danville, CA (petman2@yahoo.com)

I see nothing. Literally nothing. Very strange. Come on guys and gals, lets help this person out. Someone out there has to have seen this.

Any fertilizer, foliar feed, insecticide, herbicide, etc. in the week or two prior?

7/19/2006 1:41:21 AM

Kalamazoo, MI (Jpwrhse@charter.net)

Miracle Grow 2 weeks ago, Bifenthrin 1 week ago, will do again today (SVB), I sprayed tebuconozole the day I posted this message in case of fungus or powdery mildew or something. Can't tell if that has helped yet or not. Plant seems to be growing fine but don't want to ignore in case it is the start of a bigger problem.

7/19/2006 10:24:58 AM

President - GPC

LongMont Pete sprayed Bifenthrin on his kins and reported issued with the leaves. It did not kill them but he said it curled/ deformed them. Im getting ready to poss do the same think for yellow leaves but mine are on the old growth first.

7/19/2006 2:09:32 PM

Kalamazoo, MI (Jpwrhse@charter.net)

My problem seems to be spreading. I think it is a problem originating in the old growth first as well. Your pic looks similar but I have nothing like what you have under my leaves. Also my leaves aren't curling, new growth leaves are big and beautiful, old growth continues to brown around the edges and seems to have expanded to a couple more leaves as well.

7/20/2006 10:54:42 AM

Ctpumpkin@optonline.net

This is a strange one. It looks like a Leafg Spot disease. But which one? The necrosis is fairly defined by veins so I want to suggest Angular Leaf Spot. But then in another part of the same leaf a leison has breached a vein.

Here is a fact sheet with some of the classic ALS lesions pictured.

http://s142412519.onlinehome.us/uw/pdfs/A3801.PDF

It could also be Ulocladium leaf spot but it doesn't look like Target LS.

This Cornell link has some of the common leaf spots for veiwing.

http://vegetablemdonline.ppath.cornell.edu/DiagnosticKeys/CucurLeaf/CucLeafKey.html

7/20/2006 2:13:00 PM

Kalamazoo, MI (Jpwrhse@charter.net)

I'm wondering if we are not seeing several different things. I see alot of information about older leaves geting brown around the edges with age, starting around this time of year. The holes in the middle could be left over damage from the cuke beetles before I killed them. Finally the yellowing I'm seeing on some of the newer leaves could be from Bifenthrin. Doesn't appear to be any of the things listed in the pages you sent me Tremor. I think we will wait this out and see what happens. If I loose the plant it will be a leason learned. I will keep updating as necessary. Thanks to everyone for their help.

7/20/2006 3:20:52 PM

Ctpumpkin@optonline.net

Keep in mind that bonce damage to a leaf has occurred (like beetle chewing, wind stress, etc) the resulting necrosis (brown stuff) takes a little while to stabilize.

Foliar diseases are like that too. If a fungicide works & stops a disease that was active, then for several days we are still watching the damaged cells dying. Once the tissue has finished drying up, we call the brown spot "necrotic". Many growers mistake this for a failure, which in one way it was. If we predict disease occurrence properly & always spray right before the pathogen starts infection, then the successful spray event results in....you guessed it....absolutely nothing! If fungicides work as desired, we see nothing happen. LOL What a let down success is huh?

Remember that while there are many different leaf spot variations, the fungicdes for leaf spots are (mostly) all the same so a positive ID isn't necessary to be succesful controlling it. Bacterial leaf spots are a little different.

7/20/2006 6:19:39 PM

Hudsonville, Michigan (michiganpumpkins@sbcglobal.net)

Hey Jpwrhse:
I don't know about the leaf problem, but if you are interested, we are having the first ever Michigan Giant Pumpkin Growers Patch tour tomorrow (Saturday) and this year it happens to be in the Grand Rapids area. You may be able to pick the brains of some of the state's best if you can make it...We are meeting at the Hudsonville McD's at 9:15am. Five patches, then picnic at Joe Platte's place.
e-mail me if you want more info...
Frank

7/21/2006 7:33:57 AM