Stopped Spraying......

6 years ago

1st year plantings last year, I def. did notice some shrubs deleafed a bit early into the season due to No Spray....

This year, I started spraying around early summer, right after the 1st spring flush. Was consistent around 10-14 days (kinda was spraying right before a heavy forecasted rain). Did notice some roses - the oldest leaves were not deep green but more like a yellowish green, so I have back off spraying in the last 2-3 weeks to see and observe....

So far, I don't see signs of BSD, just one or 2 shrubs with a few very yellow leaves.

Buds are starting to bloom.

Going to stop spraying unless I see signs of BSD. Buses definately much more leafier on the ones I observed last year with BSD and more canes than leaves ;-)

Featured Answer

Moses, Pitt PA, cold W & warm/humid S z6

6 years ago

last modified: 6 years ago

If you are growing black spot prone roses, unsprayed, they will show damage sooner or later. Your yellowing older leaves are more than likely due to heat/dehydration stress, or just plain old leaves whose functional life of no longer than 5-6 months, is coming to an end. At that age even a vigorous, healthy bush growing under ideal conditions says 'good bye,' to those leaves. They often don't look very good before their end.

Moses

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Comments (7)

lkayetwvz5
6 years ago
Wish you the best. After this season I will either be using a systemic or eventually shovel pruning a whole bunch of new 'disease resistant' roses.

'kinda spraying right before a heavy forecasted rain' - was that supposed to be facetious? Otherwise a waste of spray if not. One of the problems usually around here there's never a good time to spray because of rain.
a1an
Original Author
6 years ago
last modified: 6 years ago
ikay.....skip the systemic. pollinators and all.

It's my understanding spraying pre rainy event is primarily so that once on foliage. it prevents/mitigates the spores from doing their thing. I don't have the whole rhyme or reason, but more or less, on my 10-14 day schedule, I kinda did it before a known -rainfall- event....as a mid 2 week guideline as my rough frequency of interval.
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a1an
Original Author
6 years ago
Thx Moses. At least 3 off the top def. had BSD during spraying. I did not do a thorough check on all the foliage but more a rough eyeball since I stopped spraying for almost 3 weeks now. Just wanted to share....I wanted to be in the no spray camp, but after seeing what happens when you don't ,
Moses, Pitt PA, cold W & warm/humid S z6
6 years ago
The answer is to grow black spot free/extremely resistant roses. They're out there.

Moses
seil zone 6b MI
6 years ago
Moses is correct, even if you spray diligently you will still get some yellowing leaves. That does not mean spray more. It's just the natural life cycle of the leaves.

If you make the no spray choice you have to be prepared to wait at least a couple of years for your entire eco system to flush out any toxins you put in it earlier. That works for both fungicides and insecticides. So for a while your roses will probably look pretty shabby. It does get better though. But if you are a no spray garden you also have to learn to except that you will have disease and insect damage from time to time. You learn to live with it. Since I don't grow my roses for the leaves I concentrate on the beautiful blooms and ignore the messy leaves!
rosecanadian
6 years ago
I love this advice...especially Seil's comments.