From

Location

Message

Date Posted

Vancouver Washington

I have read several posts about the yellow mottling that can occur in AG leaves. The answers seem mixed....cold soil which causes a nitrogen shortage? - or simply a nitrogen shortage if the soil is warm - a micro-nutrient shortage - such as manganese or magnesium?

It would be great if some of you experienced sorts could please take a look at my diary and give me your input. This seems like it would be an easy diagnosis for you botany majors and plant specialists.

Here are my two pics:
http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=83959
http://www.bigpumpkins.com/Diary/DiaryViewOne.asp?eid=83960

5/28/2008 11:39:54 PM

Ohio

Vancover, I always seem to have atleast one leaf on a plant look similar to that in the beginning of the season, Im pretty sure mine is from cold soil,,,but,,, I also had leaves look similar to that when I had spider mites under the leaves. (TREMOR showed me this trick) Take a dark piece of paper and then shake the leaf over it and see if you have any white specks on the paper. If you do then you have spider mites.

5/29/2008 7:27:38 AM

Hudsonville, Michigan ([email protected])

I have the same thing on one of mine this year. Exceptionally cold May in Michigan this year. Plants are quite a ways behind average growth. I'm going with cold soil preventing nutrient uptake as the probable cause. The problem will go away as the soil heats up.

Frank

5/29/2008 9:49:01 AM

and/or this:
just the plant showing its true colors.
you'll note that the VINES of an AG plant are
a mixture of yellow and green. as long as the
MaJoRiTy of the leaves don't show yellow you are okay,
in my opinion----the only time it got outta hand for me there was definitely a LOT of the yellowing and a simple,
single sprinkling of a gallon or two of
Miracle Grow 15-30-15 (@1 TBSP./gal.)
took care of it and it did not come
back on that plant, probably in like 2002.
leaf here, leaf there, i wouldn't worry.
in fact, i just handed a plant over to my coworker
moments ago with the same darned affliction and
we are so not worried at this point---eric

5/30/2008 7:04:15 PM

[email protected]

It could also be a slight iron defficiency. A little ironite would do the trick.

5/30/2008 10:30:59 PM

Puyallup, WA

I'm not so sure that it is just one single factor. My Iron readings are over 50 ppm and I can still get an occasional yellow spot on a leaf. My soil tempperature is usually over 70 degrees...and I would not say that it is due to "cold soil". Since "stress" in humans can cause a multitude of symptomes....my theory is that it can do the same in your AG plant.

6/1/2008 1:47:24 AM