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When can I quit spraying?

Posted by jockewing 9a (My Page) on
Tue, Nov 12, 13 at 15:00

I live in S. Louisiana and must spray in order to keep blackspot in check. I usually do this on the weekend as I work during the week, and I usually never miss a scheduled "spray". All it took was a couple missed weeks in August when it kept raining right after I sprayed or the rain prevented me from spraying to defoliate several of my plants.

My question is, now that we are in November and have had a few cold fronts, do I need to keep spraying? We may not have a freeze until sometime in January here, so I don't know if there is a specific temperature at which BS quits being active. If I quit now, when do I need to re-start?

Can any of you fellow Southern growers advise me?

Follow-Up Postings:

RE: When can I quit spraying?

Blackspot will spread if wet for 8-12 hours continuously at 55 to 79 degrees. It is active year around in zone 9.

RE: When can I quit spraying?

So if it hasn't really rained in several weeks, do I still need to spray just to be safe?

RE: When can I quit spraying?

Black spot can form when there hasn't been any rain in a long time if it is humid enough. I know this from experience.

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