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 Hi! 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 possible. 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 days? 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.
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