Controlling Summer Diseases on Apples – A Brief ReminderDave Rosenberger, Anna Wallis, and Dan Donahue
Current recommendations for control of sooty blotch & fly speck (SBFS) and fruit fungal decays:
Fungicide recommendations have not changed much in recent years. A quick summary is provided below:
- Topsin M + Captan: Standard treatment for SBFS and summer fruit rots, but late-season applications of Topsin M are not acceptable for some markets, and the Topsin M label limits applications to a total of 64 oz/A/year. Most growers are finding that Topsin M must be applied at 12-16 oz/A for good results, so that means that this combination can be used no more than 4 or 5 times per year.
- Captan plus a labeled phosphite fungicide: This combination is just as effective as Topsin + Captan against SBFS, but the phosphites have little or no activity against black rot. Thus, with this combination control of black rot and other summer fruit rots is dependent on the rate of Captan that is applied.
Inspire Super + Captan: Inspire Super is very effective against SBFS, but like the phosphites, it is less effective than Topsin or strobilurin fungicides for controlling fruit rots. Using Inspire Super during summer may also contribute for selection pressure for DMI-resistant apple scab if primary scab was not completely controlled, although that assumption remains unproven.· Flint + Captan, Pristine + Captan, and Merivon + Captan all provide nearly equivalent control of both SBFS and summer fruit rots. The latter two have better long-term residual activity than Flint and are therefore preferred for the last spray in August or September when a long residual is needed to cover the gap until harvest. All of these combinations include strobilurin fungicides (FRAC group 11) and have label limitations on the total number of applications per season and/or the number of sequential applications that are allowed.· Fontelis does not have much activity against SBFS and is not recommended during summer.Captan applied alone can be effective if applied at higher rates (4 to 5 lb/A of Captan 80W) and at no more than 14-day intervals. However, mixing captan with one of the fungicides mentioned above generally provides better results.
Annual Summer Meeting of the Massachusetts Fruit Growers’ Association
in cooperation with University of Massachusetts Fruit Program
TUESDAY, July 21, 2015
Red Apple Farm
455 Highland Ave., Phillipston, Massachusetts
10:00 AM Welcome to Red Apple Farm — Al Rose, MFGA President
10:15 AM Orchard Tour
NOON Catered Lunch provided with the registration charge
1:15 PM Welcome to the Annual Summer Meeting and announcements– Al Rose, President
1:20 PM UMass update
1:30 PM Educational Program — Quan Zeng, CT Ag. Expt. Station: “Where did all the fireblight go in 2015?”
2:30 PM Adjourn
2 pesticide license recertification credit hours will be offered for the day.
Registration for this meeting will be $25 for Mass. Fruit Growers’ Association members ($35 for non-members) per person and will include the tour, educational program, pesticide recertification credits, and lunch.
To ensure the availability of the meal, please pre-register by adding the appropriate number and type (member or non-member) registrations to your shopping cart and paying with a credit card.
We must receive pre-registrations by Friday, July 17 to assure availability of the lunch.
PDF version of this announcement where you can send in your registration (by Friday, July 17) and pay by check
go to http://massfruitgrowers.org/2015/2015summermeeting.html where you can register for the meeting (by Friday, July 17) using a credit card