Tuesday, June 19, 2012

Blackspot Susceptibility; Old Garden Roses

'Madame Hardy'
At last comes the third blog in my series reviews of roses for blackspot susceptibility.  Two Mondays ago I reported my Griffith Buck roses and last Monday it was the Canadians and Rugosas.   Since I also grow a fair group of Old Garden Roses (compared to some mythical average rosarian in my mind), I'll throw down on them in this third blog of the trio.  As before, the first number is the estimated percentage of leaves with blackspot and the second number the estimated percent defoliation.

Old Garden Roses:
Fantin Latour 60%-20%
Madame Hardy 0%-0%
Double Scotch White 0%-0%
Konigin Von Danemark 0%-0%
Comte de Chambord 0%-0%
La Reine Victoria 0%-0%
Zephirine Drouhin 5%-0%
Celsiana 0%-0%
Duchesse de Montebello 0%-0%
Charles de Mills 10%-15%
Louise Odier 5%-50%
Ballerina 30%-30%
Rose de Rescht 70%-5%
Variegata di Bologna 80%-10%
Red Moss (Henri Martin) 0%-20%
Salat 0%-5%
Duchesse de Rohan 0%-5%
Reine des Violettes 10%-10%
Madame Issac Pierre 10%-0%
Cardinal de Richelieu 0%-0%
Belle de Crecy <5%-5%
Blush Hip <5%-0%
Coquette de Blanches 5%-0%
Duchess of Portland 5%-0%
Frau Karl Druschki 10%-10%
Ferdinand Pichard <5%-0%
Shailor's Provence 0%-0%
Madame Plantier 0%-0%
Maiden's Blush 0%-0%
Seven Sisters 0%-0%
La France 20%-80% (not really an OGR, but the first Hybrid Tea).

This is normally a fairly blackspot-free group, but Fantin Latour got spotted up early and pretty badly, and Variegata di Bologna presently has a touch of the fungal flu.  As you would expect however, it is hard to go wrong with Old Garden Roses.  Most of our current disease troubles began after the breeding of 'La France'.  I grow 'La France' for conversations-sake only; if there was ever a balled-up, blackspot ridden rose, it is that first miserable offspring of crossing a Hybrid Perpetual with a Tea rose.  Why, oh why, did society ever decide that 'La France' was the future of roses?  For sheer gloriousness, I think the world went wrong and should have stayed with 'Madame Hardy', 'Duchesse de Montebello', and 'Madame Plantier'. Those are three classy old dames who can still show a gardener a good time.

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