1. Plant Disease
  2. Host and Disease Descriptions

Apricot (Prunus armeniaca)-Brown Rot

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Thin canopy of an apricot tree

Shoot dieback with necrotic leaves and floral tissue.

Photo by Iain MacSwann, 1983.

See:

Cherry (Prunus spp.) - Brown Rot Blossom Blight and Fruit Rot

Chemical control Apply fungicides at popcorn and full bloom. Tank-mix or alternate chemicals from different groups with different modes of action to prevent fungi from developing resistance. Never use sulfur products on apricots.

  • Abound at 12 to 15.5 fl oz/A. May be applied the day of
    harvest. Sprayers used for Abound should not be used on apples. Group 11 fungicide. 4-hr reentry.
  • Bonide Captan 50 WP may be used in home gardens at 1 to 1.5 Tbsp/gal water. H
  • Bravo Weather Stik at 3.1 to 4.1 pints/A. Do not apply after shuck split. Avoid use when honey bees are active due to larval toxicity. Group M5 fungicide. 12-hr reentry.
  • Captan 80 WDG at 1.9 to 3 lb/A. May be applied up to the day of harvest. Not recommended due to concerns about pollinator brood development. Group M4 fungicide.
    24-hr reentry.
  • Cevya at 3 to 5 fl oz/A. May be used day of harvest. Group 3 fungicide. 12-hr reentry.
  • Eagle 20 EW at 2 to 3 fl oz/100 gal water for home orchards
    or landscape use. Can be applied up to the day of harvest. Group 3 fungicide. 24-hr reentry.
  • Echo 720 at 3.1 to 4.1 pints/A, for blossom blight only. Do not apply after shuck split. Avoid use when honey bees are active due to larval toxicity. Group M5 fungicide. 12-hr reentry.
  • Elevate 50 WDG at 1 to 1.5 lb/A. Applications may be made up to and including the day of harvest. Group 17 fungicide. 12-hr reentry.
  • Fixed-copper products are rated with low control. Avoid use when honey bees are active due to bee toxicity. Group M1 fungicides. O
    • Champ WG at 6 to 8 lb/A. Do not apply after full bloom. 48-hr reentry.
    • C-O-C-S WDG at 1 to 2.9 lb/A. 48-hr reentry.
    • Copper-Count-N at 8 to 12 quarts/A. Do not apply after full bloom. 48-hr reentry.
    • Cueva at 0.5 to 1 gal/100 gal water/A. May be used on day of harvest. Group M1 fungicide. 4-hr reentry.
    • Kocide 3000 at 3.5 to 5 lb/A. Do not apply after bloom. 48-hr reentry.
    • Monterey Liqui-Cop at 3 to 4 Tbsp/gal water. Use during bloom only. H
    • Nu-Cop 50 DF at 2 to 3 lb/A. Do not apply after bloom. 48-hr reentry.
  • Fontelis at 14 to 20 fl oz/A. Can be used day of harvest. Group 7 fungicide.12-hr reentry.
  • Indar 2F at 6 fl oz/A plus a wetting agent. Can be used up to the day of harvest. Group 3 fungicide. 12-hr reentry.
  • Inspire Super at 16 to 20 fl oz/A. Do not apply within 2 days of harvest. Group 3 + 9 fungicide. 12-hr reentry.
  • Iprodione-based products. Do not apply after petal fall or more than two (2) times per season. Generally good control if resistance is not a problem. Do not mix with insecticides due to honey bee adult and/or larval toxicity. Group 2 fungicides. 24-hr reentry.
    • Iprodione 4L AG at 1 to 2 pints/A.
    • Meteor at 1 to 2 pints/A.
    • Nevado 4F at 1 to 2 pints/A.
    • Rovral 4 Flowable at 1 to 2 pints/A.
  • Luna Experience at 6 to 10 fl oz/A. May be used day of harvest. Group 3 + 7 fungicide. 12-hr reentry.
  • Luna Sensation at 5 to 7.6 fl oz/A. Do not use within 1 day of harvest. Group 7 + 11 fungicide. 12-hr reentry.
  • Merivon at 4 to 6.7 fl oz/A. Do not use with EC or oil-based products. Only nonionic surfactants can be used within 14 days of harvest. May be used day of harvest. Group 7 + 11 fungicide. 12-hr reentry.
  • Miravis at 5.1 fl oz/A. Can be used up to the day of harvest. Group 7 fungicide. 12-hr reentry.
  • Miravis Duo at 13.6 fl oz/A. Can be used up to the day of harvest. Group 3 + 7 fungicide. 12-hr reentry.
  • Ortho MAX Garden Disease Control at 3.75 teaspoons/4gal water. H
  • Pristine at 10.5 to 14.5 oz/A. Can be used day of harvest. Group 7 + 11 fungicide. 12-hr reentry.
  • Problad Verde at 18.1 to 45.7 fl oz/A. Reapply if rain occurs within 12 hours of original application. Do not use within one day of harvest. Group BM01 fungicide. 4-hr reentry.
  • Propiconazole-based fungicides are registered. Limited to two (2) applications. Do not mix with insecticides due to bee toxicity. Group 3 fungicides. 12-hr reentry.
    • Bumper 41.8 EC at 4 fl oz/A. May be used up to and including day of harvest.
    • Infuse Systemic Disease Control at 2 Tbsp/gal water. H
    • PropiMax EC at 4 fl oz/A. Do not use within 10 days of harvest.
    • Tilt at 4 fl oz/A. May be used up to and including day of harvest.
  • Quadris Top at 12 to 14 fl oz/A. May be applied on the day of harvest. Do not mix with insecticides due to bee toxicity. Group 3 + 11 fungicide. 12-hr reentry.
  • Quash at 2.5 to 4 oz/A. Do not use within 14 days of harvest. Group 3 fungicide. 12-hr reentry.
  • QuiltXcel at 14 fl oz/A. May be applied the day of harvest. Sprayers should not be used on apples. Group 3 + 11 fungicide. 12-hr reentry.
  • Rally 40 WSP at 2.5 to 6 oz/A. Can be applied up to the day of harvest. Group 3 fungicide. 24-hr reentry.
  • Scala SC at 9 to 18 fl oz/A. Do not within 2 days of harvest. Not for cherry-only for apricot, peach, prune and plum. Group 9 fungicide. 12-hr reentry.
  • Spectracide Immunox Multi-Purpose Fungicide Spray Concentrate for Gardens at 0.5 fl oz/gal water. May be applied up to the day of harvest. Do not apply more than seven (7) times per season. Group 3 fungicide. H
  • Tebucon 45 DF at 5 to 8 oz/A. Can be applied up to and including day of harvest. Group 3 fungicide.5-day reentry.
  • Topguard at 14 fl oz/A. Do not use within 7 days of harvest. Group 3 fungicide. 12-hr reentry.
  • Topguard EQ at 6 to 8 fl oz/A. Do not use with silicone surfactants or within 7 days of harvest. Sprayers should not be used on apples. Group 3 + 11 fungicide. 12-hr reentry.
  • Topsin 4.5 FL at 20 to 30 fl oz/A plus another fungicide. Do not use within 1 day of harvest. Group 1 fungicide. 2-day reentry.
  • Vangard WG at 5 oz/A. For blossom blight only. Do not use with X-77. Tank-mix with another fungicide to improve efficacy and to manage resistance. Buffer to a pH of 5 to 7 when tank-mixing with Rovral. Group 9 fungicide. 12-hr reentry.
  • Ziram 76 DF at 6 to 8 lb/A. Do not apply within 30 days of harvest. Avoid use when honey bees are active due to larval toxicity. Group M3 fungicide. 48-hr reentry.

Notes: Do not use sulfur on apricots. Light sulfur injury can cause leaves to cup. Fruit may become brown or have brown spots. Heavy injury may kill buds or buds may only open slightly, leaves can become scorched and withered. Unicorn is registered but includes sulfur in the formulation and thus is not recommended for use.

Some registered products offer only suppression of this disease and thus are not recommended for use. These products include Flint Extra.

Biological control

  • Botector (Aureobasidium pullulans strains DSM 14940 and 14941) at 6 to 14 oz/A depending on water volume. Can be applied day of harvest. Compatible with sulfurs, oils, and a few fungicides but not with many synthetic fungicides. 4-hr reentry. O
  • BotryStop (Urocladium oudemansii U3 strain) at 2 to 4 lb/A. Keep refrigerated before use. Compatible with many wetting agents, some fungicides and biologicals but not all. Unknown efficacy in the PNW. 4-hr reentry. O
  • DoubleNickel 55 (Bacillus amyloliquefaciens strain D747) at 0.25 to 3 lb/A. Unknown efficacy. Group BM02 fungicide. 4-hr reentry. O
  • Howler (Pseudomonas chlororaphis strain AFS009) at 5 to 15 lb/A plus a surfactant. Can be used day of harvest. 4-hr reentry. O
  • Serenade ASO (Bacillus subtilis strain QST 713) at 2 to 4 quarts/A. Active ingredient is a small protein. Use only for blossom blight during bloom. 4-hr reentry. O
  • Serenade Garden Disease Control Concentrate at 2 to 4 fl oz/gal water. Use only for blossom blight during bloom. H O

Reference Mari, M., Casalini, L., Baraldi, E., Bertolini, P., and Pratella, G.C. 2003. Susceptibility of apricot and peach fruit to Monilinia laxa during phenological stages. Postharvest Biology and Technology 30: 105-109.