GRAPE VERAISON SPRAY - Berry ripening, sugar building up
| Disease | Chemical and Formulation | Rate per Acre | Remarks |
| Botrytis | Rovral 4F or Meteor OR Vangard OR Scala OR Elevate OR Switch OR Luna Experience OR Luna Tranquility |
1.0-1.33 lb or 1.5-2 lb 5-10 fl oz 9.0-18.0 oz 1 lb 11-14 oz 5.0-8.6 fl oz 16-24 fl oz |
Vanguard or Scala (same
group), Elevate, Rovral or Meteor, Switch, Elevate, and/or
Luna Experience is recommended. Carefully observe
per season limits on number of sprays. Anti-malarial
materials can be applied at beginning of ripening and
again prior to harvest if needed. Fruit rot can be
caused by a variety of organisms. Many anti-Botrytis
fungicides have little effect on organisms other than
Botrytis. Botrytis strains with resistance to
strobilurins, Endura, Pristine, and Topsin M, and with
reduced sensitivity to Rovral/Meteor are widespread in
Virginia. Isolates with reduced sensitivity to
Vanguard and Scala have also been observed in some
locations. Rotating Vanguard or Scala (same group),
Elevate, Rovral, or Meteor, Switch, Elevate, and/or Luna
Experience is recommended. Carefully observe per
season limits on number of sprays. |
| Insect |
Chemical and Formulation | Rate per Acre | Remarks |
| Spotted wing drosophila | Entrust 2SC Delegate 25WG malathion 8F Mustang Maxx 0.8EC PyGanic 1.4EC Surround WP Sevin 80WSP Sevin XLR Plus |
4-8 fl oz 3-5 oz 1.88 pt 4.0 fl oz 64.0 fl oz 25-50 lb 1.5 lb 2.0 qt |
SWD may be more important beginning at veraison, becoming greatest at 15 degrees Brix (risk increases approaching harvest, and while monitoring should begin at veraison, treatment may be delayed until later. It is critical to rotate among insecticides of varying modes of action in order to delay the development of resistance. Be watchful for flareups of secondary pests (mealybugs, spider mites) following applications of pyrethroids. When available, flowable (F) formulations pose less risk of phytotoxicity than emulsifiable (EC) formulations. For Surround, 25 lb in 50 gal/A preferred. Monitor harvest parameters closely when using Surround. PyGanic has a short residual life which limits is efficacy; Surround, Entrust and PyGanic are organic alternatives. |
| Grape
scale |
Applaud
70DF Movento 2SC Admire Pro Assail 30SG |
9-12 oz 6-8 fl oz 1.0-1.4 fl oz 2.5 oz |
Second
generation crawlers can be targeted at first and peak
activity (1100 and 2000 degree-days above 50 degrees after
April 1) (mid-July and mid-August). |
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