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  • From: Bill Shoemaker <wshoemak AT illinois.edu>
  • To: "Market Farming" <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Spinach "tip burn"
  • Date: Sat, 17 Apr 2010 07:37:57 -0500 (CDT)

Tip burn is techincally a calcium deficiency, however, practically, it's a
water relations problem. Calcium ions are carried by water through the plant
to growing tissue. But not very efficiently because of the size of the ion
and the passive movement. So if you have rapidly growing tissue, high temps
and less water available, you can get tip burn. In my experience though, its
always at the edges of the leaves. If you have a problem with the row covers,
it'll cause abrasion on more than just the leaf edges. Hope that helps you
sort it out.

Bill

---- Original message ----
>Date: Fri, 16 Apr 2010 21:38:42 -0700
>From: Chris Bailey <chrisbailey.wenatchee AT gmail.com>
>Subject: [Market-farming] Spinach "tip burn"
>To: market-farming AT lists.ibiblio.org
>
> My spinach (Emu F1, now baby leaf size) is showing
> some leaf tip damage, but it doesn't look like
> actual tip burn and I believe my calcium levels are
> okay.  It has been covered by floating row cover
> since planted (for leaf miner), but now I'm
> suspicious that the row cover is causing the damage
> (since it seems to only be upper tips that would
> have come into contact with the fabric).  Is
> spinach too tender for floating row cover?  Should
> I hoop it?  Or should I be looking for some other
> culprit?
>
> Chris Bailey
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William H Shoemaker, UI-Crop Sciences
Sr Research Specialist, Food Crops
St Charles Horticulture Research Center
535 Randall Road St Charles, IL 60174
630-584-7254; FAX-584-4610




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