Cherry at Preharvest and Harvest
See General Recommendations for guidelines on table use. Read all product labels carefully.
= link to additional information in Orchard Pest Management
Spotted wing drosophila: This recently introduced pest has caused damage in unprotected cherries. Damage is not always predicted by high trap counts in the local area. Cherries become vunerable when they change from green to straw, and are fully vulnerable several weeks before harvest. Many products used for effective cherry fruit fly control do not work well controling SWD. Recommendations made here are based largely on laboratory bioassays. See also: http://www.tfrec.wsu.edu/pages/swd/
Western cherry fruit fly: Begin protective sprays within five days of first emergence of adults is indicated by the CFF model in your region. This is usually about four weeks before harvest of Bing Cherry, or when the cherries reach late "straw" color. Continue to cover spray about every 7 to 10 days, depending upon whether the product applied has a contact or a contact/residual effect. Since the introduction of spotted wing drosophila, more attention must be concentrated on this pest, and all sprays that appear to be effective on SWD appear to be very effective on CCF. Sprays must be applied every week, or even more frequently, for SWD. Some products that were very effective for control of CFF do not effectively control SWD. So, the SWD control program should take precedence over CFF control.
Entrust SC: There is a Washington 24(c) label for Entrust that allows a shorter preharvest interval, but has more restrictions on rate and timing. See label.
GF-120 0.02% Bait: a spinosad formulation registered specifically for management of Tephritid fruit flies. This product has not proven sufficiently effective for the control of spotted wing drosophila. Monitor carefully for SWD if you use this bait. Apply to alternate rows with special auxiliary applicator; dilute with no more than 3 quarts of water per acre. Re-apply after rain. For application method, see label and web site http://county.wsu.edu/chelan-douglas/agriculture/treefruit/Pages/Cherry_Fly_Bait.aspx.
Malathion ULV : Apply malathion by air only, ULV, not mixed with water. See text--Aerial Application. Activity against spotted-wing drosophila is only a few days.
Sevin 4F: Carbaryl may cause mite flare-ups, especially with multiple applications.
Warrior II: Pyrethroids are broadly toxic to predatory mites, adn repeated use of such products may cause mite flare-ups.
Abound 2.08F: Azoxystrobin is extremely toxic to certain apple varieties. See label for further information.
sulfur, dry flowable: Apply 20 and 10 days before harvest, and at picking time. Phytotoxicity at higher temperatures is a problem.
OSO 5%SC: Apply every 7-10 days.
Ph-D: Apply every 7-10 days.
Quadris Top: The azoxystrobin component of Quadris Top is extremely toxic to certain apple varieties. See label for further information.
Rally 40WSP: Place into solution before adding oil. See remarks in shuck fall section.
petroleum oil, summer: Not after pit hardening. Do not apply to oil sensitive varieties. Do not spray wet foliage. Do not spray when freezing temperatures are anticipated within 48 hours of an oil application, above 90° F (32° C) or when plants are under heat or moisture stress.