Publication 360, Fruit Production Recommendations:
Grape Calendar - Special sprays (when monitoring indicates the need)

Table of Contents

1. Special sprays (when monitoring indicates the need)
   • Multicoloured Asian lady beetle
   • Precautions
     
2. Other grape calendar sections
   • Bud burst to first leaf
   • First leaf, 1.25-5.0 cm shoot length
   • 3-5 leaves unfolded, 10-15 cm shoot length
   • Shoot length, 20-25 cm
   • Trace bloom (first cap fall)
   • Immediate post-bloom to early fruit set
   • Berries pea-sized
   • Berry touch to cluster closure
   • Beginning of ripening (veraison) through harvest
     
3. Other topics on grapes
   • Grape growth stages
   • Grape nutrition
   • Notes on grape insects and diseases
   • Mating disruption (MD) technology for grape berry moth
   • Table 6-4. Products used on grapes
   • Table 6-5. Relative disease susceptibilities of grape cultivars
   • Table 6-6. Activity of fungicides on grape diseases
4. Grape calendar (PDF 172 kb)
5. Pub 360 - Chapter 6 Grapes (PDF 225 kb)
6. Related Links

Multicoloured Asian lady beetle(Special sprays (when monitoring indicates the need))

• Materials: Use one of:
  • Ripcord 400 EC @ 150 mL/ha
  • Malathion 85 E @ 880 mL/ha
    
• Comments: Lady beetles are not a problem unless it is very close to harvest. Begin monitoring around mid-August and continue for each cultivar until harvested. Early presence of lady beetles is not an immediate concern, because they can arrive and leave an area rapidly. Discuss beetle thresholds and product restrictions with the proposed purchaser of grapes before taking action. Continue to monitor after treatment; re-infestation may occur before harvest.
  Ripcord: Cannot be used on juice grapes destined for export to the US.

Precautions

• Read the product label and follow all safety precautions. Some grape varieties are sensitive to Sulphur, Thionex, Copper, Dikar, Flint, Pristine, Dikar plus Zolone, or other products. See Table 6-5. Relative Susceptibility of Grape Cultivars to Diseases, for specific information.
• For preharvest intervals, re-entry periods, maximum number of applications and chemical groups, see Table 6-4. Products Used on Grapes.
• Resistance management: To delay development of resistance to fungicides, miticides and insecticides, follow resistance management guidelines outlined in Pest Resistance to Insecticides, Fungicides, Miticides. In addition, take the following steps to avoid rapid development of fungicide resistance:
  • Do not reduce rates below those specified on the label.
  • Do not use Nova, Sovran, Flint, Lance, Revus, or Pristine as eradicants when sporulating lesions of the target disease are present.
  • Use sufficient water to provide thorough coverage.
• Preharvest intervals: Contact the processors and wineries directly in regard to their preharvest interval policy. Preharvest intervals listed in Table 6-4. Products Used on Grapes are taken from product labels. In some cases, regulations on residues in finished products (e.g. wine) are much more stringent. Many processors require longer preharvest intervals than stated on product labels. Some processors and wineries also have special restrictions for certain pest control products regarding number of applications or application after a certain crop stage. Consult the grape purchaser for more details.
• Spray water volumes: Sufficient water volumes are necessary to provide complete coverage with grape fungicides, miticides and insecticides. Increased water volumes are necessary as the season progresses and canopies grow. Canopy management through hedging, leaf-pulling and shoot thinning, as well as proper sprayer calibration, are critical to ensure proper spray coverage. Sufficient coverage and efficacy are not possible if water volumes are inadequate. Some types of sprayers are able to provide sufficient coverage with less water than others. Consult equipment dealers or professional crop consultants about the amount of water needed to ensure adequate coverage. Read and follow water volume requirements on all product labels.

Related Links

• Notes on Grape Pests
• Grapes in Ontario
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• Search the PMRA website
• Ontario Minor Use Program
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control: Grapes