My guess is that it’s not so much the heat as the humidity, Kevin. I think when you get as dry as it gets in Riverside on a hot day, it may indeed kill off the epiphytic bacteria, and make further transmission difficult. Today and tomorrow it looks like your dewpoint is 47 to 52 F (8 to 11 Vincent), and RH dips to nearly 20%! Perhaps the heat/water stress also stops progress in infected tress.
Dan > On May 22, 2017, at 12:36 PM, Vincent Philion <vincent.phil...@irda.qc.ca> > wrote: > > Hi! > > it would be interesting to define “cool” in the southern California context. > ;-) > > Temperature in the mid-90 (35 ℃ for the rest of the planet) (or more) clearly > isn’t favorable for blight. Flowers age faster at that temperature, while the > bacteria is slowed down. > > Plus, if the trees are under water stress the bacteria can’t progress > normally. > > Your “cool” is our “warm” and that’s why we struggle with FB, but also scab > and CM. > > Vincent > > > >> Le 22 mai 2017 à 00:29, kuffelcr...@kuffelcreek.com a écrit : >> >> A long, cool spring here in Southern California allowed quite a few FB >> strikes, three days in the low to mid-90's stopped it in its tracks. >> Formerly limp shoots with sticky ooze and now crispy and dry, and pruned >> stumps do not get re-infection. That's all I'll see of it until next >> spring, weeks of 100+ weather and 5% humidity sees to that. Unfortunately >> it doesn't slow down the CM a bit, which is my next nemesis on the >> calendar. >> >> Kevin Hauser >> Kuffel Creek Apple Nursery >> Riverside, California >> Nakifuma, Uganda >> >> On Mon, 22 May 2017 02:45:06 +0000 (UTC), lee elliott <pippm...@yahoo.com> >> wrote: >>> For the first year ever I havent seen any FB here is western Illinois, >>> could it be th 86 degree days we had burned it out, I believe FB burns >> out >>> after a few hot days, some dont believe this but experience has taught >> me >>> it is true, Shoot bligt and root sucker blight has allways been a >> problem, >>> I am sceptical that these antobiotic sprays work at all, only good for >> the >>> blooms and chemical dealers, Copper does work well on young hursery and >>> non-bearing trees that get shoot blight where your not woried about >> fruit >>> finish, My person opiniion, low soil levels of copper, (do a leaf >> anayisis) >>> make the tree stressed and contribute to FB. Just my 2 cents worth, Lee >>> Elliott, Upstart Nursery, Winchester Illinois >>> _______________________________________________ >>> apple-crop mailing list >>> apple-crop@virtualorchard.com >>> http://virtualorchard.com/mailman/listinfo/apple-crop >> _______________________________________________ >> apple-crop mailing list >> apple-crop@virtualorchard.com >> http://virtualorchard.com/mailman/listinfo/apple-crop > > _______________________________________________ > apple-crop mailing list > apple-crop@virtualorchard.com > http://virtualorchard.com/mailman/listinfo/apple-crop _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.com http://virtualorchard.com/mailman/listinfo/apple-crop
