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Common Strawberry Diseases in Florida

Michelle S. Oliveira and Natalia A. Peres

This new two-page publication of the UF/IFAS Plant Pathology Department describes symptoms of most common strawberry diseases in Florida and summarizes the efficacy of fungicides labeled for management of such diseases. It is best viewed as a PDF.

Fungal

Phytophthora Crown Rot (Phytophthora cactorum)

 

Figure 1. 
Figure 1. 

 

Colletotrichum Crown rot (Colletotrichum gloeosporioides)

 

Figure 2. 
Figure 2. 

 

Charcoal Rot (Macrophomina phaseolina)

 

Figure 3. 
Figure 3. 

 

Botrytis Fruit Rot (Botrytis cinerea)

 

Figure 4. 
Figure 4. 

 

Anthracnose Fruit Rot (Colletotrichum acutatum)

 

Figure 5. 
Figure 5. 

 

Powdery Mildew (Podosphaera aphanis)

 

Figure 6. 
Figure 6. 

 

Leather Rot (Phytophthora cactorum P. nicotianae)

 

Figure 7. 
Figure 7. 

 

Phomopsis Leaf Blight and Soft Rot (Phomopsis obscurans)

 

Figure 8. 
Figure 8. 

 

Stem-End Rot and Leaf Blotch (Gnomonia comari)

 

Figure 9. 
Figure 9. 

 

Bacterial

Angular Leaf Spot (Xanthomonas fragariae)

 

Figure 10. 
Figure 10. 

 

Resources

 

Figure 11. 
Figure 11. 

 

Tables

Table 1. 

CONVENTIONAL

FUNGICIDES

(listed by FRAC group)

FRAC GROUP1

COMMON DISEASES OF STRAWBERRIES

Phytophthora crown rot

Colletotrichum crown rot

Botrytis fruit rot

Anthracnose

Powdery mildew

Leather rot

Angular leaf spot

Topsin (thiophanate-methyl)

1

-

++

-

-

-

-

-

Rovral (iprodione)

2

-

-

++

-

-

-

-

Orbit (propiconazole)

3

-

?

-

++

+

-

-

Mettle (tetraconazole)

3

-

?

-

+

+

-

-

Rally (myclobutanil)

3

-

-

-

-

+

-

-

Procure (triflumizole)

3

-

-

-

-

+

-

-

Ridomil (mefenoxam)

4

+++

-

-

-

-

+++

-

Fontelis (penthiopyrad)

7

-

-

++

-

++

-

-

Kenja (isofetamid)

7

-

-

+++

-

-

-

-

Scala (pyrimethanil)

9

-

-

+

-

-

-

-

Abound (azoxystrobin)

11

-

++

+

++

+

-

-

Cabrio (pyraclostrobin)

11

-

++

+

++

+

-

-

Flint (trifloxystrobin)

11

-

++

+

++

+

-

-

Evito (fluoxastrobin)

11

-

++

+

++

+

-

-

Quintec (quinoxyfen)

13

-

-

-

-

+++

-

-

Elevate (fenhexamid)

17

-

-

++

-

-

-

-

Aliette (fosetyl-Al)

33

+

-

-

-

-

+

-

phosphites (many brands)

33

++

-

-

-

-

+

-

Quilt Xcel (azoxystrobin + propiconazole)

3+11

-

++

-

++

++

-

-

Luna Tranquility

(fluoypram + pyrimethanil)

7+9

-

-

+++

-

?

-

-

Merivon (fluxapyroxad + pyraclostrobin)

7+11

-

++

++

++

+++

-

-

Pristine (boscalid + pyraclostrobin)

7+11

-

++

+

++

++

-

-

Switch (cyprodinil + fludioxonil)

9+12

-

++

+++

++

-

-

-

copper (many brands)

M1

-

-

-

-

-

-

+

sulfur (many brands)

M2

-

-

-

-

+

-

-

Thiram (thiram)

M3

-

+

++

+

-

-

-

Captan (captan)

M4

-

++

+

++

-

-

-

Captevate (captan + fenhexamid)

M4+17

-

+

++

+

-

-

-

Actigard (acibenzolar-s-methyl)

P1

-

-

-

-

-

-

++

Torino (cyflufenamid)

U6

-

-

-

-

+++

-

-

1 FRAC code (fungicide group): Numbers (1 through 46) and letters (M, P, and U) are used to distinguish the fungicide mode of action groups. All fungicides within the same group (with same number or letter) indicate same active ingredient or similar mode of action. This information must be considered for the fungicide resistance management decisions. M = chemical multi-site inhibitors; P = host plant defense inducers; U = unknown mode of action and unknown resistance risk. Source: FRAC Code List 2019; http://www.frac.info/ (FRAC = Fungicide Resistance Action Committee).

(+++) = good efficacy; (++) = moderate efficacy; (+) = low efficacy; (-) = no efficacy or not registered; (?) = not tested, or inconclusive. Efficacy based on 2 or more trials conducted by the UF/IFAS GCREC Strawberry Pathology program. Fungicide efficacy may vary according to frequency of fungicide resistance in the field.

Footnotes

1. This document is PP354, one of a series of the Plant Pathology Department, UF/IFAS Extension. Original publication date November 2019. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication.
2. Michelle S. Oliveira, graduate student; and Natalia A. Peres, professor, Plant Pathology Department, UF/IFAS Gulf Coast Research and Education Center, Wimauma, FL 33598.

Fungicide recommendations on this poster are provided for general information only. All fungicides must be applied in accordance with label directions. Not all fungicides or all formulations available for strawberry are listed in the table. The use of trade names in this publication is solely for the purpose of providing specific information. UF/IFAS does not guarantee or warranty the products named, and references to them in this publication do not signify our approval to the exclusion of other products of suitable composition. All chemicals should be used in accordance with directions on the manufacturer's label.