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How long to wait to spray Cornell on new roses?

Posted by trberry5 6b (My Page) on
Wed, Apr 21, 04 at 11:36

I just received 3 new rose bushes and am wondering if I need to wait to start them on Cornell. I mean, i don't know what the nursery used on them and don't want to risk burning the leaves if they've used sulfur or something.

What do ya'll usually do?

Follow-Up Postings:

RE: How long to wait to spray Cornell on new roses?

  • Posted by Kimm1 4a/5b-MI (My Page) on
    Fri, Apr 23, 04 at 7:13

If these are potted and already leafed out you could start spraying now, if its necessary. If these are bare root there is no reason to spray until they leaf out.

RE: How long to wait to spray Cornell on new roses?

I disagree on the basis that research has shown that blackspot is carried in lesions on the canes. This is all the more reason to spray the canes thoroughly whether they have leafed out or not.

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