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When can I quit spraying?

10 years ago

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?

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Comments (3)

michaelg
10 years ago
Blackspot will spread if wet for 8-12 hours continuously at 55 to 79 degrees. It is active year around in zone 9.
jockewing
Original Author
10 years ago
So if it hasn't really rained in several weeks, do I still need to spray just to be safe?
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amberroses
10 years ago
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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