Melanie L. Lewis Ivey and Rachel Medina Fruit Pathology Program Department of Plant Pathology The Ohio State University-Wooster Campus Wooster, OH

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1 Plant Pathology Series No. 14 February 2018 elanie L. Lewis Ivey and Rachel edina Fruit Pathology Program Department of Plant Pathology The Ohio State UniversityWooster Campus Wooster, OH Revised January 2018

2 Table of Contents Table of Contents...1 General Comments...2 Stages of Grape Berry Development...4 Fungicide Spray Program...5 Dmant...5 Oneinch shoot...5 Three to five inch shoot...6 Ten to twelve inch shoot...6 Immediate prebloom to early bloom...6 First postbloom... Second postbloom... Third postbloom...8 Fourth postbloom...9 Fifth postbloom...10 Spray ProgramAtaGlance...11 Acknowledgements...12 Contact Infmation

3 General Comments 1. All spray programs should be designed to enhance an integrated disease management program. Very rarely do chemicals alone prevent slow disease to a level that minimizes economic losses. There is no single chemical that is effective against all foliar diseases, which means that a combination of products in a spray program is necessary to optimize disease management. 2. A spray program should be designed with the critical periods of target diseases in mind. F example, in anthracnose is a problem in the vineyard, dmant fungicide applications are very imptant f season long control. F successful Phomopsis control, early season fungicides (1 to 5 inch shoot growth) are critical. After bloom, the threat of Phomopsis infection is greatly reduced. The period from immediate prebloom through 4 to 5 weeks after bloom is the OST CRITICAL PERIOD f controlling fruit infection by black rot, powdery mildew and downy mildew. Four to five weeks after bloom, the fruit become resistant to black rot, powdery mildew and downy mildew; however, the leaves and rachises (cluster stems) remain susceptible to both powdery and downy mildew f the rest of the season. Therefe, fungicide protection against both downy and powdery mildew may be required through harvest. F tight cluster Vinifera grape varieties an additional fungicide treatment should be added during bloom to protect against Botrytis bunch rot.. A spray program should be thoughtfully developed to prevent and slow the development of fungicide resistant pathogens in the vineyard. Fungicides that have a sitespecific mode of action are classified as medium to high risk f fungicide resistance development. Fungicides with Fungicide Resistance Action Committee (FRAC) codes numbers 1, 2,, 4,, 9, 10, 11, 1, 16, 4, 4, 49, U06, and U08, are medium to high risk fungicides and no me than two sequential applications of a highrisk fungicide should be applied befe alternating to a fungicide with a different mode of action. Do not over use fungicides (there are restrictions on how frequently highrisk fungicides can be applied) and only apply fungicides at the recommended manufacturer rates. It is unlawful to apply fungicides in a manner that is inconsistent with the product label. The powdery mildew, downy mildew and Botrytis bunch rot fungi are the most problematic with respect to fungicide resistance problems on grapes. Usually the first indication of resistance in the vineyard is when a fungicide does not provide the same level of control compared to previous years, especially on susceptible varieties. In the wst case scenario, the material provides no control and the crop is lost due to disease. It is imptant to continually monit (scout) the vineyard f signs and symptoms of reduced disease control. There are no commercial labaties that screen pathogens f fungicide resistance. If you suspect that resistant fungi are present in the vineyard please contact Dr. elanie Lewis Ivey f assistance in confirming resistance and developing an alternative fungicide spray program to slow prevent additional resistance development in your vineyard. 4. Be aware of incompatible chemicals. ixing pesticides can save time and lab costs but not all pesticides are compatible and may result in undesirable reactions. F example, the mixing of incompatible chemicals may reduce the effectiveness of one me of the active ingredients in the mixture, cause an unwanted (and sometimes dangerous) chemical reaction, injure the plant (i.e. phytotoxicity). It is illegal to mix pesticides with other products (such as other pesticides, adjuvants, carriers) when such mixtures are expressly prohibited on the label. The following 2

4 combinations of fungicides plant protectants can cause serious vine injury when applied to vines at the same time within 14 days of each other: Hticultural oils (i.e. JS Stylet Oil) with sulfur Hticultural oils (i.e. Stylet Oil) with Captan Seven XLR (insecticide) with Captan 5. Spray guides are recommendations only. Product efficacy may vary depending on disease pressure, weather conditions, product coverage, the presence of resistant pathogen populations and/ the grape variety. F any given disease and at any specific application timing there are many registered fungicide options. The fungicides listed in this program are recommendations only and this guide does not include all of the fungicides currently registered f use on grapes. The cost of a fungicide per application and acre can vary significantly. The final fungicide spray program that you develop should consider the cost of specific fungicides selected as well as the targeted diseases and the potential f resistance development in the pathogen population. In this guide, the estimated relative cost of each fungicide per acre per application is provided based on 201 retail costs (see Table below). The cost of fungicides will vary depending on the supplier and the quantity purchased. Relative Cost Estimates Per Acre above

5 4

6 Grape Fungicide Spray Program2018 This program emphasizes fungicide resistance management and is intended to provide simultaneous protection against anthracnose (ANTH), Phomopsis cane and leaf spot (PHO), black rot (BR), powdery mildew (P), and downy mildew (D). Specific recommendations f Botrytis bunch rot (BOT) and Phytophtha root rot (PHYT) are also included in this program. Dmant and One Inch Shoot Growth Stage Product (rate/a) FRAC Code Dmant Sulfix (1 gal) Relative cost (per acre/application) Target Diseases ANTH One inch shoot Ridomil Gold SL (.6 pt) ancozeb ( lb)* 4 PHYT BR, PHO PLUS Aprovia ( fl oz) Kenja 0SC (2022 fl oz) Fracture ( fl oz) erivon ( fl oz) Luna Sensation** (4.0.6 fl oz) Rally (4 fl oz) Inspire Super (1620 fl oz) ettle (5 fl oz) Tino 0.85F (.4 fl oz) Endura 0 WG (4.5 oz) Vivando 2.5 F ( fl oz) Sulfur** Quintec 2.08F ( fl oz) Potassium salts*** JS Stylet Oil (12%)**** B U6 U8 1 P * ancozeb is the backbone of the spray program f grapes in Ohio and should be used until the 66 day postharvest interval (PHI) is met. The final application of ancozeb will depend on the grape variety. ** Several sulfur fmulations are available including wettable, flowable and dry flowable. Sulfur should not be applied to Concd grapes sulfur sensitive vinifera varieties. Consult the product label f usage rates and restrictions. *** Potassium salts are not protectants. They provide moderate to good control of powdery mildew when applied to 5

7 developing colonies only. Several materials with potassium salts as the active ingredient are available including Nutrol, Kaligreen and Amicarb. Consult the product label f usage rates and restrictions. **** The label f JS Stylet Oil recommends a final concentration of 12%. When applied on a 10 day schedule at the high rate, physiological problems with fruit have been observed. 5 Inch Shoot to First Postbloom Spray Growth Stage Product (rate/a) FRAC Code 5 inch shoot ( 10 days after the last spray) Same fungicides as one inch shoot Relative cost (per acre/application) Target Diseases PHO, P 1012 inch shoot ( 10 days after the last spray) Same fungicides as one inch shoot BR, P, D Immediate prebloom to early bloom ( 10 days after the last spray) Same fungicides as one inch shoot OR USED ALONE Revus Top 2.08 F ( oz)* Pristine ( oz)* BR, P, D BR, P, D * Revus Top Pristine used alone provides excellent control against black rot, downy mildew and powdery mildew. Revus Top should not be applied to Concd nonvinifera hybrids as leaf burning may occur. Consult the label f other restrictions. 6

8 First postbloom spray (no longer than 10 days after the last spray) Same fungicides as immediate prebloom to early bloom PLUS* Ridomil Gold (2.5 lb)** Ridomil Gold Copper (2 lb)*** Revus (8 fl oz) Ranman ( fl oz) Fum (6 fl oz) Zampro (1114 fl oz) BR, P, D D * If conditions are highly conducive f downy mildew infections during this period (temperatures above 50 F, rainy and high humidity at night) the addition of a product specific to D should be added to the program. It is very imptant to remember that these materials will need to be tank mixed with other fungicides because they will not provide adequate control of powdery mildew black rot. Second Postbloom Spray Growth Stage Product (rate/a) FRAC Code Second postbloom spray (no longer than 10 days after the last spray) Same fungicides as immediate prebloom to early bloom PLUS* Ridomil Gold Z (2.5 lb)** Ridomil Gold Copper (2 lb)** Revus (8 fl oz) Ranman ( fl oz) Fum (6 fl oz) Zampro (1114 fl oz) Relative cost (per acre/application) Target Diseases BR, P, D D * The second postbloom spray is near the end of the critical period (immediate prebloom through to 4 weeks after bloom) f controlling fruit infection by black rot, powdery and downy mildew. However, cluster stems (rachis) and leaves will remain susceptible to powdery and downy mildew throughout the growing season; therefe, a good fungicide program needs to be maintained throughout the season. **If conditions are highly conducive f downy mildew development (rainy and cool to warm temperatures (64 to 6 degrees F), Ridomil Gold Z Ridomil Gold Copper is recommended.

9 Third Postbloom Spray Growth Stage Product (rate/a) FRAC Code Third postbloom spray (1014 days after the last spray) ancozeb ( lb)* Captan 50 W (24 lb) Phosphous acid** Revus (8 fl oz) Ranman ( fl oz) Fum (6 fl oz) Zampro (1114 fl oz) PLUS Relative cost (per acre/application) Target Diseases D Rally (4 fl oz) Inspire Super (1620 fl oz) ettle (5 fl oz) Tino 0.85F (.4 fl oz) Endura 0 WG (4.5 fl oz) Vivando 2.5 F ( fl oz) Sulfur Quintec 2.08F ( fl oz) Potassium salts OR USED ALONE +9 U6 U8 1 Revus Top 2.08 F ( fl oz)*** + P, D Pristine ( oz)*** +11 * ancozeb has a 66 day preharvest interval and should only be used on late maturing varieties at this period in the program. If you still have me than 66 days until harvest, ancozeb should be used. ** Phosphous acids (phosphonates, phosphites) are sold as nutritional supplements and plant conditioners, but a few products are registered f use as fungicides f downy mildew control on grape. They provide good control of downy mildew. Several materials with phosphous acids as the active ingredient are available including ProPhyt, Phostrol, AgriFos, Rampart, Topaz. Consult the product label f usage rates and restrictions. *** Revus Top Pristine used alone provides excellent control against black rot, downy mildew and powdery mildew. Revus Top should not be applied to Concd nonvinifera hybrids as leaf burning may occur. Consult the label f other restrictions. 8

10 Fourth Postbloom Spray Growth Stage Product (rate/a) FRAC Code Fourth postbloom spray (1014 days after the last spray) Captan 50 W (24 lb)* Phosphous acid Revus (8 fl oz) Ranman ( fl oz) Fum (6 fl oz) Zampro (1114 fl oz) PLUS Relative cost (per acre/application) Target Diseases D Rally (4 fl oz) Inspire Super (1620 fl oz) ettle (5 fl oz) Tino 0.85F (.4 fl oz) Endura 0 WG (4.5 fl oz) Vivando 2.5 F ( fl oz) Sulfur* Quintec 2.08F ( fl oz) Potassium salts OR USED ALONE +9 U6 U8 1 Fixed copper* and ** Revus Top 2.08 F ( fl oz)*** Pristine ( oz)*** D, P * Do not apply Captan, sulfur copper fungicides within 0 days of harvest the fermentation process may be adversely affected. ** If dry weather persists and the risk of downy mildew is low, fixed copper will provide good control of both downy and powdery mildew. *** Revus Top Pristine used alone provides excellent control against black rot, downy mildew and powdery mildew. Revus Top should not be applied to Concd nonvinifera hybrids as leaf burning may occur. Consult the label f other restrictions. 9

11 Fifth Postbloom Spray Growth Stage Product (rate/a) FRAC Code Fifth postbloom spray through harvest (maintain a 1014 day spray schedule) Same fungicides as fourth postbloom PLUS* Vangard 5WG (10 fl oz) Elevate 50WG (1 lb) Scala 5SC (918 fl oz) Endura 0WG (8 fl oz) Switch 8 WG (1114 fl oz) Pristine (18.52 fl oz)** OR Relative cost (per acre/application) Target Diseases D, P BOT Rovral 4F (1.52 pt) PLUS Latron B1956 (6 fl oz/100 gal) 2 * On tight clustered Botrytis bunch rot susceptible varieties the addition of a product specific to Botrytis should be added to the program. The first spray should be made when symptoms are first observed at veraison ( shtly thereafter). A second spray should be made if conditions fav disease development (wet, cool weather) at least 14 days after the first spray. On late maturing varieties, a third spray may be required. ** F grapes grown f ice wine production an application of Pristine immediately pri to harvest may aid in controlling some fruit rots of ripe grapes, especially during falls and early winters when temperatures remain high. Rates listed are to be used f Botrytis control only. Other rates and restrictions apply f additional diseases, refer to the label f me infmation. 10

12 2018 Spray Program AtaGlance The fungicides listed in this program are recommendations only and this figure does not include all of the fungicides currently registered f use on grapes. 11

13 Acknowledgements The spray program provided in this guide was developed using recommendations published by the idwest Fruit Pest anagement Guide and fungicide efficacy data from experimental trials conducted in Ohio and throughout the Ntheastern United States. Rachel edina provided the relative fungicide cost data. We are grateful to the Ohio Grape Industry Committee f funding to suppt this publication. Dr. elanie Lewis Ivey Assistant Profess State Fruit Pathology Specialist State Fresh Produce Safety Specialist The Ohio State UniversityWooster Campus 1680 adison Avenue Selby Hall Wooster, OH Office Phone: Ivey.14@osu.edu Website: u.osu.edu/fruitpathology/ Facebook: facebook.com/ohiograpeip Contact Infmation CFAES provides research and related educational programs to clientele on a nondiscriminaty basis. F me infmation, visit cfaesdiversity.osu.edu. F an accessible fmat of this publication, visit cfaes.osu.edu/accessibility. 12

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