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Fredericton, New Brunswick, Canada

Can anyone suggest whats wrong with this leaf? There are a few of these in my patch. Not too many so its likely not an immediate concern. But I wonder what the cause is?
http://tingleyspc.homelinux.org/Photos/Pumpkins/2007/img_0347.jpg
http://tingleyspc.homelinux.org/Photos/Pumpkins/2007/img_0348.jpg

Thanks, Daryl

9/8/2007 2:02:14 PM

Santa Rosa California

i'm not sure what it is called but i've seen it before

9/8/2007 2:59:48 PM

Topsfield, Ma.

Pretty interesting leaf design there...sorry I can't add any insights. probably good it isn't rampant throughout the patch !
Best of luck, Duff

9/20/2007 8:06:23 PM

Ctpumpkin@optonline.net

It is unusual to see yellow veins like that. One would suspect that a mobile element such as Nitrogen was deficient & beig pulled out of the older leaves to grow the new ones.

Cold can do strantge things too.

We need more info.

Are all secondaries terminated?
Have all the tertiaries been kep cut?
What kind of fertility program?
Soil tests results: pH, %OM, Mg. K, etc

9/21/2007 10:14:38 AM

Fredericton, New Brunswick, Canada

Thanks you for your interest in my problem. I am getting more and more leaves with this pattern, so I would like to understand the cause.
Secondaries terminated - around 15'
Tertiaries: Early in the year they were cut of, but since the middle of August, the patch has become somewhat overrun.

Fertilizer consisted of lots of manure last fall (fall 2006) and some fertilizer (high N) this spring, before planting. Nothing since. Soil results taken mid August 2007. The pattern did occur after the first cool night. Perhaps shortly after, not sure.

OM 3.3
N-not tested (lab doesnt do it)
ph 7.0
P 288
K 568
Ca 3049
Mg 190
B .8
Cu 7.0
Zn 6.6
S 336
Mn 73
Fe 245
Al 888
Sodium 83
%K 6.5
%Mg 7.1
%Ca 68
%Na 1.6

9/26/2007 8:04:54 PM

Ctpumpkin@optonline.net

Nitrogen is a potentially mobile element. When the plant needs N to create new growth, the older leaves make the sacrifice. These leaves appear to be middle age which suggests that the oldest leaves aren't functioning well now. The LOW %OM would suggest that N is suffering especially now that the temps are dropping.

To test this theory, choose a section of the plant & hit it with higher Nitrogen. If the symptoms subside then we probably have our answer.

9/27/2007 1:04:57 AM

Fredericton, New Brunswick, Canada

Thanks again for your intrest. There is not much growing time left here, so experimenting will have to wait. I mentioned adding nitrogen fertilizer in the spring. In fact it was a slow release Nitrogen (bad idea), which I have been accusing of causing too much growth in late summer. (Seemed to be more vigorous than other years).
After reading your previous note I have been wondering if Magnesium is the problem. (Mg is a bit low I think)

Any thoughts on that?

9/27/2007 1:50:34 PM

Berlin,mi.(zuhlke2@hotmail.com)

http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=67433
http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=67430
here's a couple of post from sherry larue. maybe this will give you an idea. looks identical to me.

9/27/2007 2:49:37 PM

Fredericton, New Brunswick, Canada

Thanks very much Steve. The pictures are pretty similar. Seems to confirm Tremor's idea that a shortage of something, maybe Nitrogen, is the problem.

The pumpkin on the plant those leaves were on (a 1502) went down in early Sept, OTT about 362. The remaining plant in the field has the same symptoms, and more and more leaves are getting it. I may as well try hitting it with some N, although I expect frost here anytime.

9/27/2007 8:27:35 PM