Ninebark and powdery mildew
Posted 26 April 2012 - 08:52 AM
Posted 26 April 2012 - 09:32 AM
If they're subjected to irrigation spray, you might check to see if modifying the watering schedule could dry them out a little quicker.
If none of those things works, then I'm with you - move 'em or lose 'em.
Posted 26 April 2012 - 06:32 PM
A good rule of thumb when pruning out canes: Remove up to a 1/3 of older canes a year...
Consider donating your shrubs to a volunteer garden group should you decide not to keep them...
Posted 28 April 2012 - 09:37 AM
Posted 28 April 2012 - 08:02 PM
Interesting article with a University of Connecticut evaluation of various ninebarks for mildew resistance, at http://www.amerinurs...ticle-7868.aspx -- note that Summer Wine is pretty good but plain old, been-around- forevere' Nanus' is a virtual star.
Also notes there about you-didn't-suspect-this-is-what-mildew-can-do fungal deformities.
As for treating mildew-prone plants:
Milk and water I haven't heard of, but Cornell University Extension did quite a lot with baking soda and water years back; found it fairly effective, although it had to be re-applied after rains and in general applied more often than over-the-counter fungicides (which are formulated with sticking agents in the mix). MY daughter an I used it on roses and phlox and tried to be scientific about it -- it was helpful against mildew and black spot but no way was it armor-all, or a cure.
The garlic oils, oil soap sprays (we've used Murphy's oil soap, 1T in about half-gallon of water) and even canola oil, have shown as much effect in mildew prevention. (None of the fungicides or home formulae are curatives, just preventives.) Also the anti-dessicants form effective fungus-protection barriers -- products such as Wilt Pruf and Moistur-in.
But just to say: Organic is a slippery term. How natural is it for a plant to have a milk bath, or for stems and soil to be doused with sodium bicarb or oil? All organic tenets say to first make sure you have done everything you can to correct the culture -- the light, air, water, soil -- before doing these things with topicals.
Posted 01 May 2012 - 11:31 AM
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