Source: NCSU COOPERATIVE EXTENSION, 7/19/22

Before I get into the disease updates for the week, just a reminder to register for the 2022 Apple Field Day, which will be held on Thursday, July 28 beginning at 4 p.m.! It’s free, and if we get enough sponsors we may actually feed you something other than a disease apple from one of my research orchards…….

At this point in the season, you’ve likely got a solid program of captan, ziram, ProPhyt, and/or a strobilurin such as Merivon or Luna Sensation working for you. Most growers I’ve spoken with have been doing a great job of tightening those spray intervals and it’s my hope this rainy weather begins to calm itself. For summer rot (e.g. bitter rot, black rot) and GLS, if you’ve applied a strobilurin (FRAC 11) 2 or fewer times this season, I’d consider the following: Captan (1/2 rate) + Merivon (5.5 fl oz) OR Ziram (3-4 lbs/A) + Merivon (5.5 fl oz/A) + a sticker such as Bond Max. If there’s been strobilurin resistance confirmed in your orchard I’d choose captan over the ziram option, or simply mix all three fungicides. The Merivon also has excellent efficacy against flyspeck/sooty blotch.

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