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STRAWBERRY DISEASES


Disease Chemical and Formulation Rate/100 gal Dilute Acre Concentrate Remarks
Leaf spot (Mycosphaerella fragariae)

Leaf scorch (Marssonia fragariae)

Leaf blight (Dendrophoma obscurans)

captan 80WDG
OR
thiram 65WSB
PLUS
Topsin-M 70W
OR
Rally 40WSP
OR
Pristine 38WG
OR
Cabrio 20EG
OR
Orbit 3.6E
--

2.5 lb

0.7 lb

--

--

--

--

1.9-3.7 lb

4-5 lb

1.0 lb

2.5 oz

18.5-23 oz

12-14 oz

4.0 fl oz

Use approximately 150 gal of spray per acre. Apply the spray at 7-10 day intervals from the time new growth starts.  Do not apply more than 30 lb of captan/A/year. Do not apply more than 115 oz of Pristine/A/year. Do not apply more than 70 oz of Cabrio/A/year.  Note Restricted Entry Intervals and Preharvest Intervals on label.
Powdery Mildew (Sphaerotheca sp.) Rally 40WSP
OR
Orbit 3.6E

--

--
2.5 oz

4.0 fl oz

Begin applications when disease first appears. Repeat applications at 7-14-day intervals. Do not apply more than 30 oz of Nova/A/year.
Gray mold fruit rot (Botrytis cinerea
Leather rot (Phytophthora cactorum)
Topsin-M 70W
OR
Rovral 50W or 4F
PLUS
Captan 80WDG
OR
Thiram 65WSB
OR
Elevate 50WDG
OR
Switch 62.5WDG
OR
Abound 2.08F
OR
Pristine 38WG
OR
Cabrio 20EG
OR
Scala 600SC

0.7 lb

--

3.0 lb

--
 

--

--

--

--

--

--

1.0 lb

1.5-2 lb

1.9-3.7lb

4-5 lb
 

1.5 lb

11-14 oz

6.2-15.4 oz

18.5-23 oz

12-14 oz

18 fl oz


Because of potential for cross resistance to Topsin-M and to Rovral and because of ineffectiveness against leather rot, it is recommended that these compounds be combined with captan or thiram when possible. Although the preharvest interval for captan is 0 days, protective clothing must be worn if entering the planting within 1 day of captan application.  Do not apply Rovral more than once per season or after first fruiting flower. Elevate, Switch and Scala are registered for control of gray mold only.  Apply Elevate or Scala alone or in tank mix combinations with the recommended rate of another fungicide (such as captan) registered for grey mold control, beginning at early bloom prior to establishment.   Continue applications every 7-14 days, but avoid making more than two consecutive applications before alternating with another registered gray mold fungicide.  In tank mix combinations, Elevate may be used at the rate of 1.0-1.5 lb/A  and Scala may be used at 9 fl oz/A.  Pristine, Cabrio, and Abound may be applied the day of harvest.  Scala may be applied to one day before harvest. Maximum/A/year: Captan 80WDG - 30 lb; Elevate - 6 lb; Switch - 56 oz; Abound - 1.9 qt; Pristine - 115 oz; Cabrio - 70 oz; Topsin M - 4 lb.  Scala - 54 fl oz.   Abound is extremely phytotoxic to some apple cultivars, including 'Gala'. Prevent spray drift and leftover residues in the spray tank which may come in contact with apples.
Fruit Rots
Anthracnose (Colletotrichum fragariae)
Abound 2.08F
OR
Pristine 38WG
OR
Cabrio 20EG
OR
Captevate 68WDG
OR
Orbit 3.6E
--

--

--

--

--
6.2-15.4 oz

18.5-23.0 oz

12.0-14.0 oz

5.25 lb

4.0 fl oz

Note: Quadris is extremely phytotoxic to some apple cultivars.  Prevent spray drift and left over residue in the spray tank which may come in contact with apples.
 
Red Stele (Phytophthora fragariae and leather rot control:

Ridomil Gold is registered for red stele and leather rot control. For established plantings apply a 1 pt/treated acre. Make one application in the spring before first bloom. A second application may be applied after harvest in the fall. For supplemental leather rot control, an application may be made during harvest. Consult the label for use with irrigation and for rates for band application. For new plantings make one application after transplanting, a second one 30 days before the beginning of hravest. A third application may be made during harvest season.
Aliette 80WSP and 80WDG are also registered for red stele and leather rot control For red stele control at planting time, strawberry roots and crowns may be dipped 15-30 minutes at the rate of 2.5 lb per 100 gal. Plant within 24 hours after dipping. Aliette may also be applied as a foliar spray for red steele control at the rate of 2.5-5.0 lb/A 14-21 days after planting and continued on a 30-60 day interval as long as conditions favor disease development. In perennial plantings, begin applications when the plants start active growth in the spring. When red stele conditions persist, make additional applications on a 30-60 day interval. For leather rot control begin applications of Aliette at 2.5-5 lb/A at 10% bloom and early fruit set and continue on a 7-14 day interval as long as conditions favor disease development. Aliette may be applied the day of harvest (REI=12 h). Do not exceed 30 lb of Aliette per season.  Several other phosphorous acid products are labeled similarly for red stele and leather rot control, including Agri-Fos, Phostrol and ProPhyt. See those labels for specific use instructions and rates for each product.


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Web Site Author: Douglas G. Pfeiffer