APRICOT: FUNGICIDE EFFICACY - CONVENTIONAL

Note: Do not use sulfur at any time on apricot trees or use captan preharvest on apricot fruit.

Rating: 5 = excellent and consistent, 4 = good and reliable, 3 = moderate and variable, 2 = limited and/or erratic, 1 = minimal and often ineffective, 0 = ineffective, NL = not on label, and ND = no data.

* Registration pending in California.

** Not registered, label withdrawn or inactive in California.

*** Postharvest fruit registrations in California include: BioSpectra/Uniguard, Chairman, Mentor, Penbotec/Pyrimethanil, and Scholar/FDL.

¹ Code numbers are assigned by the Fungicide Resistance Action Committee (FRAC) according to different modes of actions (for more information, see http://www.frac.info/). Fungicides with a different Code number are suitable to alternate in a resistance management program. In California, make no more than one application of fungicides with mode-of-actions (MOA) with high resistance risk before rotating to a fungicide with a different MOA (Code number); for other fungicides, make no more than two consecutive applications before rotating to fungicide with a different MOA (Code number).

² Do not use fungicides with the same FRAC number and high resistance risk more than twice in one year.

³ Strains of Monilinia fructicola and M. laxa resistant to Topsin-M and T-Methyl have been reported in some California apricot orchards. Resistant strains of the jacket rot fungus, Botrytis cinerea, have been reported in California on crops other than almond and stone fruits and may have the potential to develop in apricots with overuse of fungicides with similar chemistry. Sub-populations of both Monilinia spp. have been shown to be resistant to AP (FRAC 9) fungicides on prune in CA.

⁴ To reduce the risk of resistance development, start treatments with a fungicide with a multi-site mode of action; rotate or mix fungicides with different mode of action FRAC numbers for subsequent applications, use labeled rates (preferably the upper range), and limit the total number of applications per season.

⁵ Blossom blight only; not registered for use after petal fall.

⁶ The oil is a "light" summer oil, 1-2% volume/volume.

⁷ High summer temperatures and relative humidity reduce efficacy.

⁸ Has not been tested on apricot but is effective against the jacket rot pathogens.

⁹ Do not use after jacket (shuck) split.

¹⁰ Do not use in combination with or shortly before or after oil treatment.

¹¹ Causes fruit browning or staining as a preharvest spray.

APRICOT: TREATMENT TIMING

Note: Not all indicated timings may be necessary for disease control.

Rating: 3 = most effective, 2 = moderately effective, 1 = least effective, and 0 = ineffective

¹ Begin at red bud, add one or two more sprays if weather favors disease.

² Repeated treatments at 7- to 14-day intervals may be necessary; earlier treatments are most effective.

³ If pathogen spores were found during fall leaf monitoring, apply a shot hole fungicide during bloom, preferably at petal fall or when young leaves first appear. Re-apply when spores are found on new leaves or if heavy persistent spring rains occur. If pathogen spores were not present the previous fall, shot hole control may be delayed until spores are seen on new leaves.

⁴ Applications are made to pruning cuts.