| Disease | Chemical and Formulation | Rate per Acre | Remarks |
| Black rot | Ziram OR mancozeb 75 DF OR Rally 40WSP OR tebuconazole 45% (Orius 45DF, formerly Elite) OR Abound OR Sovran OR Flint OR Pristine OR Adament OR Inspire Super OR Revus Top OR Luna Experience |
2-4 lb 2-4 lb 3-5 oz 4 oz 10.0-15.5 fl oz 3.2-5.6 oz 2 oz 8.0-12.5 oz 4.0-7.3 oz 16.0-20.0 oz 7.0 oz 5.0-8.6 oz |
Infection occurs at 7 or more hours of leaf wetness (dew, fog, and/or rain), depending on temperature. Apply all fungicides before or between these wet periods. Spray every 10-14 days throughout the growing season according to the label. Do not use sterol inhibitors (group 3, Rally, Elite, Orius, Procure, Inspire Super, Mettle, Revus Top) or strobilurins (group 11, Abound, Sovran, Flint or Pristine) continuously; rotate with other fungicides. |
| Downy mildew | captan 50WP OR mancozeb 75DF OR Ridomil Gold MZ OR phosphorous acid OR Gavel OR Revus OR Revus Top OR Forum OR Ranman Or Presidio OR Zampro |
2-4 lb
2-4 lb 1.5-2 lb see label 2.0-2.5 lb 8 oz 7 oz 6 oz 2.1-2.75 oz 3-4 oz 11-14 fl oz |
Apply 2 weeks before blossom caps begin to
drop on very susceptible varieties. Downy mildew
strains with resistance to Abound and Pristine are present
in many Virginia locations. Rotating or tank mixing
with a different anti-downy-mildew material is
recommended. Presidio should be tank-mixed with
another fungicide active against downy mildew. |
| Powdery mildew | tebuconazole 45% (Orius 20AQ) OR wettable sulfur (81.25% or 92%) OR Rally 40WSP OR Procure OR Pristine OR Endura OR Quintec OR Adament OR Inspire Super OR Revus Top OR Vivando OR Luna Experience OR Luna Tranquility |
8.6 fl oz 2-4 lb 3-5 oz 4-8 oz 6.0-12.5 oz 4.5 oz 7.2 oz 16-20 oz 7 oz 10.3-15.4 oz 5.0-8.6 oz 16-24 fl oz |
Do not use sterol inhibitos (see above under black rot) or strobilurins continuously; rotate with other groups of fungicides. Powdery mildew strains with resistance to the strobilurins (Abound, Sovran and Flint) are very common in Virginia, and can cause control failure! It is recommended that strobilurins be tank mixed with sulfur or another anti-mildew material. Pristine contains a strobilurin, but also a different active chemical (group 7) and does not need to be tank mixed. Rates for sulfur can be increased to as high as 5 lb per 100 gallons. Severe disease pressure may warrant this, but beware of possible plant injury at higher rates. |
GRAPE PRE-BLOOM SPRAY
| Insects/Mites | Chemical and Formulation | Rate per Acre | Remarks |
| Grape berry moth (GBM) | Tourismo OR Entrust 2SC OR Intrepid 2F OR Altacor 35 WDG OR Delegate 25WG OR Imidan 70WP OR Belay 50WDG OR SPLAT-GBM OR Avaunt 30DG OR Sevin XLR OR Bacillus thuringiensis (Bt) |
10-14 fl oz 4-8 fl oz 12.0-16.0 fl oz 2.0-4.5 oz 3.0-5.0 oz
2 lb 6 fl oz 1 kg 5.0-6.0 oz 2.0 qt Rates vary |
ere pest has been a problem in the past. Intrepid standard label recommends 4-8 fl oz; see supplemental Dow guidelines for higher rate. Mating disruption (Isomate) is registered for GBM. Use full labeled rate and consult a grape entomologist before use for specific instructions. Spray edge rows. The REI for Imidan may render it impractical for most growers. For SPLAT-GBM mating disruption, apply when temperatures are between 60-80F, and when no rain is expected within 1-2 hours. For high population densities, apply 1 kg/A as 1000 point sources of 1 g (1/4 tsp) throughout the acre. For low-moderate populations, apply 1 kg as 250 point sources of 2.5 g (1.2 tsp). See application information on label. See Table for REI and PHI information. |
| Grape leafhopper | Assail 70WP Assail 30SG Actara 25WDG Admire Pro Imidan 70WP malathion 8F Surround 95WP Sevin XLR Plus Nexter 75WP |
1.1 oz 2.5 oz 1.5-3.5 oz 1.0-1.4 fl oz 2 lb |
Apply Surround at least 2-3 times at 7-14 day intervals throughout infestation. Not recommended for table grapes because of visible residues. The REI for Imidan may render it impractial of most growers. See Table for REI and PHI information. |
| 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 |
Apply when crawlers are
active, or at 493 and 990 degree-days above 50 degrees
starting at April 1 (early and peak activity of first
generation). |
| Grape
tumid gall |
Movento 2SC |
6-8 fl oz |
Apply when galls first appear
in blocks with history of high grape tumid gall populations. |
| Rose
chafer |
Assail 30SG Sevin XLR Imidan 70WP |
2.5 oz 2 qt 1.3-2.1 lb |
Variable pest status; may reach high numbers is some years. |
| Periodical cicada | Danitol 2.4EC |
10 fl oz |
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Web Site Author: Douglas G. Pfeiffer