Yes, the copper is absorbed and spread throughout the plant. From the Phytoncorp website:Ray, is phyton 27 considered systemic?
Particle size? These are applied as solutions.I use copper occassionally. I have kept it off dendrobes as per the 'heresay'. I did spray a renanthera seedling and it died but who knows. It doesnt harm paphs at recommended concentrations. You should note that 'copper' isnt copper. Apparently particle size is very important for effectiveness. The finer the better.
Leslie , what amount/ concentration do you use ?I have used phyton 27 on all plants in my collections including the cuthsbertsoniis, kingianum hybrids, dendrobium species with no issues. I do use a lower dose and wash blooms after (sometimes they damage softer cattleya blooms).
I have not tried other brands so I can't speak for them.
In former times a mix of Calcium Hydroxide and Copper Sulphate was used as fungicide for growing grapes, called BORDEAUX MIX.I read an interesting article in an AU orchid mag where a chemist did experiments on reducing the toxicity of copper sprays by mixing it with lime. If I remember correctly ,he also did trial with dendrobium and found no toxicity problems when used this way. He advised not to let it drip onto the p/mix particularly if it was acidic. He said it was still one of the most potent anti-fungals to be had. I now mix copper (oxychloride in this case) with calcium hydroxide into a paste before diluting then use that for spraying.
Yes. Copper sprays are suspended particles in solution. Particle size is important. http://www.scaffolds.entomology.cornell.edu/2012/SCAFFOLDS 3-12-12.pdfParticle size? These are applied as solutions.
Yes. Copper sprays are suspended particles in solution. Particle size is important. http://www.scaffolds.entomology.cornell.edu/2012/SCAFFOLDS 3-12-12.pdf
I read another article but cant find it now; same consclusions.