GRAPE PRE-BLOOM SPRAY

 
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

4.0 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
1.88 pt
12.5-50 lb
2 qt
5.2-10.67 oz

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