Do you see long vertical cankers, dark brown streaking, cracking bark?
On 7/20/18, Doug Nelson <doug.nel...@nelsonmultimedia.com> wrote: > hugh makes me think i dont have fire blight given his description. What I > have happening is clusters of trees (about 4 or 5 per cluster in 3 > different clusters) across my 6000 tree orchard. When the tree becomes > symptomatic all the leaves brown and the entire tree seems to dies withing > 5 days- all the leaves become droopy then brown at once. Maybe this is > something else happening? Attached are pictures. > [image: 22297.jpeg] > [image: 22289.jpeg] > [image: 22291.jpeg] > [image: 22301.jpeg] > > On Thu, Jul 19, 2018 at 7:45 AM Kari Peter <ka...@psu.edu> wrote: > >> Pruning out fire blight this time of year can be tricky depending how >> much >> fire blight you are pruning out. Excessive pruning will encourage more >> shoot growth = more shoot growth means susceptible shoots to fire blight >> right now especially with conditions favorable for disease. Trees should >> be hardened off right now meaning new shoot growth should be finished. >> When this occurs, the bacteria stops moving in the trees and new fire >> blight incidence should stop. I would highly recommend avoiding doing >> anything that would encourage new shoot growth right now. If it were me, >> I >> would just wait until the dormant period to aggressively remove >> everything. There is much debate about cleaning pruning shears between >> cuts. I don’t recommend it because the bacteria can move 3 feet beyond >> the >> site of visible infection, so disinfesting is a moot point. Here is my >> latest article (June 26, 2018) in Penn State Fruit Times about what to do >> about fire blight now (it’s just below the info about apple scab): >> >> >> >> https://extension.psu.edu/mid-season-tree-fruit-disease-update >> >> >> >> And a note: do not spray any streptomycin. Streptomycin is for bloom >> time >> only, and after a trauma event, such as hail. Do not spray it beyond >> these >> times. If you are concerned about new shoot growth (if this is a new >> orchard pushing right now), I would recommend Cueva to limit spread of >> shoot blight. >> >> >> >> Kari Peter, Ph.D. >> Assistant Research Professor - Tree Fruit Pathology >> Department of Plant Pathology and Environmental Microbiology >> Penn State Fruit Research and Extension Center >> 290 University Dr., P.O. Box 330 >> Biglerville, PA 17307-0330 >> >> Office: 717-677-6116 Ext. 223 >> Fax: 717-677-4112 >> E-mail: ka...@psu.edu >> <https://webmail.psu.edu/webmail/shell.cgi?timestamp=1362517824> >> >> Twitter: https://twitter.com/drtreefruit >> >> >> >> >> >> >> >> >> >> *From:* apple-crop-boun...@virtualorchard.com [mailto: >> apple-crop-boun...@virtualorchard.com] *On Behalf Of *Hugh Thomas >> *Sent:* Thursday, July 19, 2018 1:14 AM >> *To:* Apple-crop discussion list >> *Subject:* Re: [apple-crop-2] What to do when fireblight hits tall >> spindle >> >> >> >> Doug, it's sort of complicated. First, you probably know the bacteria >> travels from the tip downwards. The idea is to cut well below where the >> infection has traveled. You can cut away some bark and see where the >> brown >> area meets green cambium. I cut pass this point - well past it. I'm >> guessing I would cut about three times the length of the affected area. >> For >> example, if the tip has died back 6 inches, I would remove 18 inches of >> that limb. This is my gut but but this has worked for me in the past. I >> don't know the extent of your knowledge, but you need to be careful not >> to >> spread the bacteria with your tools and hands. Some people dip their >> tools >> in alcohol or Clorox between cuts. I use Clorox wipes on my shears, >> making >> sure I use a fresh wipe almost every cut, as the wipe ought to be very >> wet. >> On small limbs, say a quarter of an inch or less, I rip the limb off. The >> big thing is, take action now!! With warm weather you can get a lot of >> damage. If you burn the limbs, don't let the smoke drift into your >> orchard >> - something a guy told me.... >> >> Sent from my iPhone >> >> >> On Jul 18, 2018, at 10:24 PM, "wincowg...@centurylink.net" < >> wincowg...@centurylink.net> wrote: >> >> Doug- where are you located? >> >> What rootstock(s)? >> >> What cultivars? >> >> How old are the trees in your tall spindle? >> >> What was your fireblight control program at bloom? >> >> any post bloom program(s) >> >> >> >> Win >> >> >> >> On Jul 18, 2018, at 9:26 PM, Doug Nelson >> <doug.nel...@nelsonmultimedia.com> >> wrote: >> >> >> >> I appear to have fireblight popping up in my orchard. The ipm group tells >> me to prune all limbs back to central leader and not to do any spraying. >> >> >> >> What do you do? >> >> _______________________________________________ >> apple-crop mailing list >> apple-crop@virtualorchard.com >> http://virtualorchard.net/mailman/listinfo/apple-crop >> >> >> >> Win Cowgill >> >> Apple-Crop Co-Founder >> >> Professor Emeritus, Rutgers, the State University >> >> Visiting Scholar, UMASS-Amherst >> >> CEO- Win Enterprises International, LLC >> >> Editor Horticultural News >> >> PO Box 143 >> >> Baptistown, NJ 08803 >> >> Office 908-489-1476 >> >> Fax- 908-996-6404 >> >> Email: wincowg...@mac.com >> >> www.wincowgill.com >> >> www.virtualorchard.net/ >> >> http://giselacherry.com/ >> >> http://virtualorchard.net/njfruitfocus/index.html >> >> http://www.appletesters.net >> >> http://nc140.org >> >> Twitter @mrsuncrisp <https://twitter.com/mrsuncrisp> >> >> >> >> _______________________________________________ >> apple-crop mailing list >> apple-crop@virtualorchard.com >> http://virtualorchard.net/mailman/listinfo/apple-crop >> >> _______________________________________________ >> apple-crop mailing list >> apple-crop@virtualorchard.com >> http://virtualorchard.net/mailman/listinfo/apple-crop >> > > > -- > Doug Nelson > President > Nelson Multimedia Inc. > -- Maurice Tougas Tougas Family Farm Northborough,MA 01532 508-450-0844 _______________________________________________ apple-crop mailing list apple-crop@virtualorchard.com http://virtualorchard.net/mailman/listinfo/apple-crop
