Hi Vince:
Regulaid and LI700 have different formulations that can each have different 
effects on different chemicals.. For example, Kasumin is more soluble in water 
than strep. and strep is insoluble in organic solvents like ether, ethanol, 
etc. (LI700 has PE-ether see blow), not sure about Kasumin.

Regulaid..  2-butoxyethanol (surfactant used in paint), poloxalene ( used as a 
stool softener and non ionic surfactant), monopropylene glycol (used as 
moisturizer in cosmetics)

LI700 … Methylacetic Acid (used as a solvent in paint, nail polish, and glue), 
Phosphatidycholine (soybased product), Alkyl Polyoxyethylene Ether (a non ionic 
surfactant that enhances penetration of certain chemicals through membranes).

Mosbah Kushad University of Illinois

From: apple-crop [mailto:apple-crop-boun...@virtualorchard.com] On Behalf Of 
Vincent Philion
Sent: Wednesday, June 21, 2017 4:15 PM
To: Apple-Crop discussion list <apple-crop@virtualorchard.com>
Subject: Re: [Apple-Crop] Shopping list: Looking for insight on flyspeck, fire 
blight, pheromone trap thresholds


Won’t answer about SBFS, but hopefully someone will. ;-)

My 2 cents for other disease stuff:

2) Fire blight
     Why is Regulaid specified as a penetrant adjuvant for use with 
streptomycin applications during bloom?  Does it have unique characteristics 
that make it better for this purpose than other penetrants such as LI700?

We don’t have Regulaid, but I can tell you substituting for LI700 doesn’t work 
for Kasumin. Never tried with Strep.

We had reduced efficacy when LI700 was mixed with Kasumin.

     If grower is applying captan at same time, has much strep efficacy is lost 
by not adding the penetrant to the mix to avoid captan phytotoxicity?

It’s interesting you mix strep with fungicides considering this should reduce 
strep efficacy:

Goodman, Robert N., 1964: Compatibility of streptomycin with some fungicides 
and insecticides. Plant Dis Reporter: 180-181

     If there is none or even minimal active fire blight in the orchard, is 
there reason to spray strep after hail damage?

I see none whatsoever.

 My take on it has been to not bother as long as you are just cutting fire 
blight out, and that it is more important to remove fire blight as soon as 

I didn’t change my opinion since we wrote that about 10 years ago. But this 
question keeps coming back.

Toussaint, V., et V. Philion. 2007. Natural Epidemic of Fire Blight in a Newly 
Planted Orchard and Effect of Pruning on Disease Development. In XI 
International Workshop on Fire Blight 793, 313‑320. ISHS.

    Do we all agree that strep provides protection for a flower for about 2-3 

Yes. But since the flower has a finite life and gets more difficult to colonize 
as it ages, there is no point in respraying the same flower.

  Though I can imagine scenario with temps around 90F where a single cohort of 
flowers could be vulnerable to a second fire blight infection period after 
receiving a strep application.

I can’t. Show me how this is possible!

Bye for now,

Vincent Philion, agr.

apple-crop mailing list

Reply via email to