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University of California Agriculture and Natural Resources Agriculture and Natural Resources Blogs
MON, MAY 27 2024
by Geoff Langford
on June 23, 2013 at 4:48 PM
Saw this last season. Check out the new primocanes. If the tips are coming through yellowish, then more likely to be iron. Otherwise I agree with your diagnosis. PH is a bit higher than I would usually see and this could be the underlying issue
by Mark Bolda
on June 24, 2013 at 8:21 AM
Thing was Geoff that the primocanes were fine. It really does seem to be a draw of that big fruit load on some of the micronutrient fractions.  
Thanks for commenting!
by Patrick Kingston
on June 24, 2013 at 9:06 AM
One note, is this is an organic ranch, may be important to mention. And what about nematodes? Has there been any sampling for Nematodes?
by Mark Bolda
on June 24, 2013 at 10:52 AM
Hi Patrick, I will add the note about it being an organic ranch. We already talked, but so everybody else knows nematode evaluations are normally done as part of the workup at the UCCE Diagnostic Lab and none were found here.
by miguel ahumada
on July 18, 2013 at 8:27 PM
I had see this often in fields here in Oxnard. I always I tribute to Mg, Mn, Fe deficiency...specially in soil around with a 7.2 thought the double charge of this cation react with soil ph and become fix in the soil solution..
by Mark Bolda
on July 19, 2013 at 7:57 AM
I see your point Miguel, in this case we have a soil of 7.6 and sure enough Mn, Fe and Mg are in short supply in the yellow leaves when compared to the green.  
Great input here.
by miguel ahumada
on September 18, 2013 at 11:18 AM
Mark..I had seing this sysmthoms over and over in southern california. I 'm total agreed about the way to proceed...When I encounter these sypthoms I had treated as Mn, Mg, Fe defienciences and I have corrected with Chelates and fertilizers that have these minarals! Miguel
Reply by Mark Bolda
on September 18, 2013 at 3:23 PM
Thanks Miguel for your comments on this - interesting that it has become so common in Southern California, since I've only seen it as pronounced as it is here once (which was the reason for the post). Keep an eye peeled for more!
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