Vegetable Disease Control Schedules

(1)

David B. Langston, Jr.

Extension Vegetable Pathologist – University of Georgia

Vegetable Disease Control Schedules

1. South Georgia Tomato Fungicide Spray Programs

2. Efficacy of Fungicides/Bactericides for Controlling Foliar Diseases of Beans

3. Broccoli/Cabbage Fungicide Spray Programs

4. Cantaloupe Fungicide Spray Programs

5. Collard, Kale, Mustard, Turnip (greens) Fungicide Spray Program

6. Cucumber Fungicide Spray Programs

7. Efficacy of Fungicides/Bactericides against Foliar Diseases of Cucurbits

8. Pepper Fungicide Spray Program

9. Squash Fungicide Spray Program

10. Succulent Legume (snap, lima, pole bean) Fungicide Spray Programs

11. Watermelon Fungicide Spray Program

(2)

South Georgia Tomato Fungicide Spray Programs 2012 David B. Langston, Jr.

Extension Vegetable Pathologist – University of Georgia

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack tomato during the growing season(s) in Georgia.

Spray Schedule = 3.5 day Fall or Winter/Spring Spray No. Fungicide(s)/disease activity

Pre-plant 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15.

Georgia 3-way or WSP or Paladin Pic

Actigard at 0.33 oz/acre in 30-50 gallons of water copper fungicide + mancozeb + chlorotalonil1/BS + EB copper fungicide + mancozeb/BS

Actigard at 0.33 oz/acre in 30-50 gallons of water

copper fungicide + mancozeb + Quadris or Cabrio/BS + EB + TS copper fungicide + mancozeb/BS

copper fungicide + mancozeb + chlorothalonil1/BS + EB copper fungicide + mancozeb/BS

copper fungicide + mancozeb + Quadris or Cabrio /BS + EB + TS copper fungicide + mancozeb/BS

Actigard at 0.75 oz/acre in 70-100 gallons of water copper fungicide + mancozeb + chlorothalonil1/BS + EB copper fungicide + mancozeb/BS

copper fungicide + mancozeb + Quadris or Cabrio /BS + EB + TS copper fungicide + mancozeb/BS

copper fungicide + mancozeb + Endura or Switch or Fontelis/BS + EB + BOT + TS copper fungicide + mancozeb/BS

copper fungicide + mancozeb + Endura or Switch or Fontelis/BS + EB + BOT + TS and so on until harvest or pre-harvest interval……. 1

Chlorothalonil (Bravo, Echo, Equus, etc)

Always read the label for detailed application instructions or consult the Georgi

a

Pest Control Handbook.

(3)

EFFICACY OF FUNGICIDES/B ACTERICIDES FOR CONTROLLING FOLIAR DISEASES OF BEANS 1

David Langston, Extension Plant Pathologist

REGISTERED FUNGICIDES2 DISEASES C o m m o n r u st A si an s o yb ea n r u st A n th ra cn o se C er co sp o ra D o w n y m il d ew P o w d er y m il d ew F o li ar b act er ia l d is eas es W h it e m o ld ( S cle ro tin ia ) S o u h te rn s te m r o t ( S . r o lfs ii ) P y th iu m d am p in g -o ff P y th iu m c o tto n y le ak R hi zo ct on ia s o re s h in A er ia l R h iz o cto n ia F u sa ri u m c ro w n r o t Endura (boscalid) U U U U N U N E P N N U U N Fontelis (penthiopyrad) U U U U N U N E G N N U U N Headline (Pyraclostrobin) E E G E U U N N G-F N FV F G N Quadris/Amistar (azoxystrobin) E E G G U U N N E N FV G E N Switch (cyprodinil + fludioxinil) U U U G N U N F N N N U U N Ridomil Gold Copper (mefenoxam + cupric hydroxide) P P P P G-F N G-F N N P GV N N N

Rildomil Gold SC (mefenoxam) N N N N N N N N N G P N N N

Phosphite or phosphorous acid fungicides N N F U F N N N N N G-F N N N

Rovral (iprodione) N N N N N N N G N N N F P N Terraclor (PCNB) N N N N N N N N G-F N N G N N Fixed copper3 _P _P _P _P _N _P _G _N _N _N _P _N _N _N Bravo/Equus (chlorothalonil) G F F G G P N N N N N N P N Folicur/Tebuzol (tebuconazole) G G P G N G-F N P G N N U F N Rally (myclobutanil) E E N G-F N G N N N N N U F N

Topsin (thiophanate methyl) U U G-F G N U N F N N N P P P

1

Ratings for products were conducted at the 2005 Southeast Extension Vegetable Workers Conference in Fletcher, NC. Efficacy ratings do not necessarily indicate a labeled use.

V = Variable levels of control.

R = Pathogen resistance (insensitivity) may be present at some locations.

E = Excellent disease suppression, G = Good disease suppression, F = Fair disease suppression, P = Poor to no disease suppression

U = Unknown efficacy N = No efficacy

(4)

Broccoli/Cabbage Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack these brassicas during the growing season(s) in Georgia.

Spray Schedule = 7 day Fall or Winter/Spring

Spray No. Fungicide(s)/disease activity Pre-plant 1. 2. 3. 4. 5. 6.

Besides deep-turning, use Terraclor/RHIZ + CR or Quadris/RHIZ

Chlorothalonil1 /DOW copper fungicide2/BR

Ridomil Gold Bravo3 or Forum or Zampro or Revus4 or Reason5 or Presidio + chlorothalonil/DOW copper fungicide/BR

Quadris or Cabrio/ALT + CERC

Ridomil Gold Bravo or Forum or Zampro or Revus or Reason or Presidio + chlorothalonil/DOW copper fungicide/BR

Switch/ALT + CERC + SCR

Quadris or Cabrio/ALT + CERC Endura or Fontelis/ALT + SCR

or

Switch/ALT + CERC + SCR or Quadris or Cabrio/ALT + CERC

Endura or Fontelis/ALT + SCR

1

Chlorothalonil (Bravo, Echo, Equus, etc…). 2

Copper is used to suppress spread of black rot caused by the bacterium Xanthomonas campetris pv. campestris. 3

Ridomil Gold Bravo and/or Presidio need to be rotated with Zampro, Forum, Revus, and/or Reason. 4

Forum and Revus have the same mode of action, so don’t spray them back-to-back. Use one or the other. 5

If Reason is used you don’t need to use Quadris or Cabrio as all three control Alternaria and Cercospora. Don’t spray Reason, Cabrio or Quadris back-to-back as they have the same mode of action.

a

Disease Acronyms: DOW = downy mildew; ALT = Alternaria leaf spot; CERC = Cercospora leaf spot;

BR = black rot; SCR = Sclerotinia (raisin head); CR = club root.

(5)

Cantaloupe Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack cantaloupe during the growing season(s) in Georgia.

Spray Schedule = Start 1 week after transplanting, then use 7 day schedule if raining once a week.

Spring Fall

Spray

No. Fungicide(s)/disease activity

Spray

No. Fungicide(s)/disease activity 1. 2. 3. 4. 5. 6. 7. 83. Chlorothalonil/GSB

copper at lowest labeled rate1/BFB

Chlorothalonil/GSB

Tebuconazole OR Inspire Super/GSB

Presidio, Ranman, Revus or Zampro /DOW or PCAP

Chlorothalonil + Fontelis/GSB + POW Quintec or Torino or Endura or Procure/POW Presidio, Ranman, Revus or Zampro /DOW or PCAP

Tebuconazole OR Inspire Super/GSB

Quintec or Torino or Endura or Procure/POW Presidio, Revus or Zampro/DOW or PCAP

Chlorothalonil + Fontelis/GSB + POW Quintec or Torino or Endura or Procure/POW Presidio, Revus or Zampro/DOW or PCAP

Chlorothalonil/GSB

Quintec or Torino or Endura or Procure/POW Presidio, Revus or Zampro/DOW or PCAP

1. 2. 3. 4. 5. 6. 7. 83. Chlorothalonil+ tebuconazole2/GSB copper at lowest labeled rate1/BFB Presidio, Ranman, or Zampro/DOW

Chlorothalonil/GSB

copper at lowest labeled rate1/BFB Presidio, Ranman, or Zampro/DOW

Chlorothalonil+ tebuconazole2 OR Inspire Super/GSB copper at lowest labeled rate1/BFB

Presidio, Ranman, or Zampro/DOW

Chlorothalonil/GSB

Presidio, Ranman, Revus or Zampro/DOW+PCAP

Chlorothalonil+ tebuconazole OR Inspire Super/GSB Quintec or Torino or Endura or Procure/POW

Chlorothalonil + Fontelis/GSB + POW /GSB Quintec or Torino or Endura or Procure/POW Presidio, Ranman, Revus or Zampro/DOW+PCAP

Chlorothalonil+ tebuconazole OR Inspire Super/GSB Quintec or Torino or Endura or Procure/POW

Chlorothalonil + Fontelis/GSB + POW /GSB Quintec or Torino or Endura or Procure/POW Presidio, Ranman, Revus or Zampro/DOW+PCAP

1

Copper is used prior to fruit set at lowest labeled rate if bacterial fruit blotch is an issue. 2

Tebuconazole (any tebuconazole) should be used at 8.0 fl oz when sprayed each time with a seasonal limit of 24 fl oz.

a

Pest Control Handbook. 3

Be mindful of preharvest intervals (PHIs) for later sprays as many may have a 7-14 day PHI.

Disease Acronyms: BFB = bacterial fruit blotch; GSB = gummy stem blight; POW = powdery mildew;

DOW = downy mildew; ANTH = anthracnose; PCAP = Phytophthora crown and fruit rot.

(6)

Collard, Kale, Mustard, Turnip (greens) Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack greens during the growing season(s) in Georgia.

Spray Schedule = 7 day Fall or Winter/Spring

Spray No. Fungicide(s)/disease activity Pre-plant 1. 2. 3. 4. 5. 6.

Besides deep-turning, use Terraclor/RHIZ + CR or Quadris/RHIZ

Zampro or Forum or Revus2 or Reason3/DOW copper fungicide1/BR

Quadris or Cabrio/ALT + CERC

Zampro or Forum or Revus or Reason/DOW copper fungicide/BR

Folicur/ALT + CERC

Quadris or Cabrio/ALT + CERC and/ Endura/ALT + SCR

or

Folicur/ALT + CERC

Zampro or Forum or Revus or Reason /DOW copper fungicide/BR

Endura/ALT + SCR

Folicur/ALT + CERC

1

Copper is used to suppress spread of black rot caused by the bacterium Xanthomonas campetris pv. campestris. 2

Forum and Revus have the same mode of action, so don’t spray them back-to-back. Use one or the other. 3

If Reason is used you don’t need to use Quadris or Cabrio as all three control Alternaria and Cercospora. Don’t spray Reason, Cabrio or Quadris back-to-back as they have the same mode of action.

a

Disease Acronyms: DOW = downy mildew; ALT = Alternaria leaf spot; CERC = Cercospora leaf spot;

BR = black rot; SCR = Sclerotinia (raisin head); CR = club root.

(7)

Cucumber Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any one practice and gives growers more disease management options at a lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack cucumber during the growing season(s) in Georgia and is not intended to be followed literally but to give an idea of the chronology of disease pressure in relation to fungicide choice. Each field in each year has different situations that call for different actions.

Spray Schedule = 7 day

Spring Fall

Spray No.

Fungicide(s)/disease activity Spray No. Fungicide(s)/disease activity 1. 2. 3. 4. 5. 6. 7. 8.

Chlorothalonil1 or mancozeb/DOW + ANTH + GSB

Chorothalonil or mancozeb/DOW + ANTH + GSB

Quadris + Folicur/RHIZ + ANTH + GSB

Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil or mancozeb/ANTH + DOW + GSB

Folicur2 + chlorothalonil/RHIZ + GSB + DOW Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil or mancozeb/ANTH + DOW + GSB

Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil/ANTH + DOW + GSB Cabrio or Topsin/ANTH Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil/ANTH + DOW + GSB 1. 2. 3. 4. 5. 6. 7. 8. Cabrio/ANTH Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil or mancozeb/ANTH + DOW + GSB

Topsin + mancozeb/ANTH + DOW

Cabrio/ANTH

Folicur + chlorothalonil/RHIZ + GSB + DOW Presidio/Ranman/Zampro/Revus/DOW + PCAP

Quadris/RHIZ + ANTH

Cabrio or Topsin/ANTH

Folicur + chlorothalonil/RHIZ + GSB + DOW Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil or mancozeb/ANTH + DOW + GSB

Presidio/Ranman/Zampro/Revus/DOW + PCAP Chlorothalonil/ANTH + DOW + GSB

1

Folicur should be used at 8.0 fl oz when sprayed each time with a seasonal limit of 24 fl oz.

a

Disease Acronyms: GSB = gummy stem blight; RHIZ=Rhizoctonia belly rot; DOW = downy mildew;

ANTH = anthracnose; PCAP = Phytophthora crown and fruit rot.

(8)

EFFICACY OF FUNGICIDES/B ACTERICIDES AGAINST FOLIAR DISEASES OF CUCURBITS 1

REGISTERED FUNGICIDES2 DISEASES A n th ra cn o se A lt er n ar ia leaf s p o t a n d b li g h t G u mmy S te m B li g h t T ar g et S po t P le ct o sp o ri u m b li gh t P o w d er y m il d ew D o w n y m il d ew B ac te ria l f ru it b lo tc h A n g u lar l eaf s p o t P h y to p h th o ra f ru it a n d c ro w n r o t P y th iu m c o tto n y le ak R h iz o ct o n ia b el ly r o t S o ut he rn s te m b li g h t ( S . r o fl sii )

Pristine (boscalid + pyraclostrobin) E-G E ER G G ER PR N N N N P P Luna Experience (fluopyram + tebuconazole) U E E G U E N N N N N U U

Fontelis (penthiopyrad) U E ER G U E N N N N N U U

Cabrio (pyraclostrobin) E-G E ER G G FR PR N N N N P P Quadris/Amistar (azoxystrobin) E-G E ER G G FR PR N N N N E G

Flint (trifloxystrobin) G E ER G G FR PR N N N N P P

Ranman (cyazofamid) N N N N N N E N N N U N N

Presidio (fluopicolide) N N N N N N E N N G P N N

Revus (mandipropamid) N N N N N N P N N G-F U N N

Zampro (ametoctradin + dimethomorph) N N N N N N G N N G U N N

Aliette (fosetyl – Al) P P N P P P P N N N P N N

Forum (dimethomorph) N N N N N N P N N FV U N N

Gavel (zoxamide + mancozeb) G-F P P G-F N N G N N U U N N Tanos (famoxate + cymoxanil) P G P P U N E-G P N P P N N

Reason (fenamidone) N N N N N N GR N N P P N N

Previcur Flex N N N N N N G-F N N N P N N

Switch (cyprodinil + fludioxinil) G E G U U G N N N N N N N Ridomil Gold Bravo (mefenoxam + chlorothalonil) G-F G-F G-F G G F GR N N GR F P P Ridomil Gold MZ (mefenoxam + mancozeb) G P P F F N GR N N GR F P P Ridomil Gold Copper (meneoxam + Cu hydroxide) N N N N N N GR G G GR F P P Rildomil Gold SC (mefenoxam) N N N N N N N N N GR P N N

Rally (myclobutanil) N N N N N G-F N N N N N N N Quintec (quinoxyfen) N N N N N E N N N N N N N Fixed copper3 _P _P _P _P _P _P _F-P _G _G _F-P _P _N _N Actigard (acibenzolar-S-methyl) U U U U U F F G G U U N N Maneb/mancozeb G P P G-F F P G P P P P N N Bravo/Equus (chlorothalonil) G G G G G F G N N P P P N Topsin (thiophanate methyl) GC F-P VR G-F U FR N N N N N P N Folicur/Tebuzol (tebuconazole) P F G U U F N N N N N F F

Procure (triflumizole) N N N N N G N N N N N N N

Torino (cyflufenamid) N N N N N E N N N N N N N

C = When used in combination with other fungicides/bactericides such as chlorothalonil and mancozeb. V = Variable levels of control, R = Pathogen resistance (insensitivity) may be present at some locations. E = Excellent disease suppression, G = Good disease suppression, F = Fair disease suppression, P = Poor disease suppression, N = no efficacy, U = Unknown efficacy.

(9)

Pepper Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any one practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack peppers in Georgia.

Spray Schedule = 3.5 day Fall or Winter/Spring

Spay No. Fungicide(s)/disease activity.

Pre-plant Methyl bromide or Georgia 3-way

1. Ridomil at plant drench/PCAP

copper fungicide/BS

2. copper fungicide/BS

3. Quintec and copper fungicide

5. Presidio through the drip/PCAP

Quintec and copper fungicide/BS

6. Cabrio or Quadris/ANTH

copper fungicide/BS

7. Quintec and copper fungicide/BS

Zampro/PCAP

9. Presidio spray or through drip/PCAP

Quintec and copper fungicide/BS

10. Cabrio or Quadris/ANTH copper fungicide/BS 11. copper fungicide/BS Zampro/PCAP 12. copper fungicide/BS 13 Cabrio or Quadris/ANTH copper fungicide/BS 14. copper fungicide/BS 15. copper fungicide/BS

and so on until harvest or pre-harvest interval…….

1_{Chlorothalonil (Bravo, Echo, Equus, etc.). Always read the label for detailed application instructions or}

consult the Georgia Pest Control handbook. Disease Acronyms: BS = bacterial spot; ANTH = anthracnose; PCAP = Phytophthora crown rot.

(10)

Squash Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack squash during the growing season(s) in Georgia and is not intended to be followed literally but to give an idea of the chronology of disease pressure in relation to fungicide choice. Each field in each year has different situations that call for different actions.

Spray Schedule = 7 day

Spring Fall

Spray No.

Fungicide(s)/disease activity Spray No. Fungicide(s)/disease activity 1. 2. 3. 4. 5. 6. 7. 8. Chlorothalonil1 or mancozeb/DOW Chorothalonil or mancozeb/DOW Chorothalonil or mancozeb/DOW Chorothalonil or mancozeb/DOW Torino or Fontelis/POW Torino or Fontelis/POW

Presidio or Ranman or Zampro/PCAP + DOW Chlorothalonil or mancozeb/ DOW

Torino or Fontelis/POW

1. 2. 3. 4. 5. 6. 7. 8.

Presidio or Ranman or Zampro/DOW + PCAP Chlorothalonil or mancozeb/ DOW

1

Folicur should be used at 8.0 fl oz when sprayed each time with a seasonal limit of 24 fl oz.

a

Disease Acronyms: GSM = gummy stem blight; RHIZ=Rhizoctonia belly rot; DOW = downy mildew; ANTH

= anthracnose; PCAP = Phytophthora crown and fruit rot.

(11)

Succulent Legume (snap, lima, pole bean) Fungicide Spray Programs 2012

David B. Langston, Jr.

Extension Vegetable Pathologist – University of Georgia

As with most crops, disease management begins prior to planting the crop to be protected. By using such

methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties,

growers can minimize the amount of disease that is available to attack their crop. Using many practices takes

all the weight off of any practice and gives growers more disease management options at lower risk. Once

plants are in the fields, however, fungicide sprays are relied on heavily for effective and economical

management of plant diseases. This spray guide is designed to encompass many disease that attack succulent

pod legumes during the growing season(s).

Spray Schedule = 7 – 14 day

Spring/Summer Fall

Spray No.

Fungicide(s)/disease activity Spray

No.

Fungicide(s) /disease activity

1. Chlorothalonil1 of Folicur/R + CERC + ALT 1. Chlorothalonil1 of Folicur/R + CERC + ALT

4. Quadris/RHIZ + R CERC + ALT 4. Quadris/RHIZ + R CERC + ALT

5. Topsin / ANTH (mainly lima bean)

Quadris/RHIZ + R + CERC + ALT

5. Topsin / ANTH (mainly lima bean)

Quadris/RHIZ + R + CERC + ALT

6. Ridomil Gold Copper or Cabrio/PYTH

Quadris/PYTH + RHIZ + R + CERC + ALT or Phosphite-type product/PYTH

7. Rally/R + RHIZ

Ridomil Gold Copper or

Quadris / PYTH + RHIZ + R + CERC + ALT Cabrio / PYTH or Phosphite-type product /PYTH

7. Rally/R + RHIZ

Ridomil Gold Copper or

Quadris / PYTH + RHIZ + R + CERC + ALT Cabrio / PYTH or Phosphite-type product /PYTH

8. Omega 500 or Rovral or Topsin or Fontelis/ SCR

1_{Chlorothalonil (Bravo, Echo, Equus, etc…).}

Always read the label for detailed application instructions of consult the Georgia pest Control handbook.

Disease Acronyms: RHIZ=Rhizoctonia belly rot; R = rust; ANTH = anthracnose; ALT = Alternaria pod and leaf spot: CERC = Cercospora leaf spot; PYTH = Pythium cottony leak; SCR = Scelerotinia or “white mold”.

(12)

Watermelon Fungicide Spray Programs 2012 David B. Langston, Jr.

As with most crops, disease management begins prior to planting the crop to be protected. By using such methods as disease-free seed and transplants, proper rotation, discing and plowing, and use of resistant varieties, growers can minimize the amount of disease that is available to attack their crop. Using many practices takes all the weight off of any on practice and gives growers more disease management options at lower risk. Once plants are in the field, however, fungicide sprays are relied on heavily for effective and economical management of plant diseases. This spray guide is designed to encompass many diseases that attack watermelon during the growing season(s) in Georgia.

Spray Schedule = Start 1 week after transplanting, then use 7 day schedule if raining once a week.

Spring Fall

Spray

No. Fungicide(s)/disease activity

Spray

No. Fungicide(s)/disease activity 1. 2. 3. 4. 5. 6. 7. 84. 94. Chlorothalonil1/GSB

Actigard and/or copper fungicide2/BFB

Chlorothalonil/GSB copper fungicide/BFB

Folicur3/GSB or chlorothalonil/GSB Actigard and/or copper fungicide/BFB

Folicur OR Inspire Super/GSB copper fungicide/BFB

Luna Experience/POW + GSB

Presidio, Revus or Zampro /DOW or PCAP copper fungicide/BFB

Folicur OR Inspire Super /GSB

Quintec or Torino or Endura or Procure or Rally/POW Presidio, Revus or Zampro/DOW or PCAP

copper fungicide/BFB

Presidio, Revus or Zampro/DOW or PCAP

Folicur OR Inspire Super/GSB

Topsin + mancozeb OR Inspire Super/ANTH + GSB Presidio, Revus or Zampro/DOW or PCAP

1. 2. 3. 4. 5. 6. 7. 84. 94. Chlorothalonil1 + Folicur3/GSB

Actigard and/or copper fungicide2/BFB

Chlorothalonil+ Folicur OR Inspire Super/GSB Actigard and/or copper fungicide/BFB

Chlorothalonil+ Folicur OR Inspire Super/GSB copper fungicide/BFB

Luna Experience/POW + GSB Presidio or Revus/DOW or PCAP copper fungicide/BFB

Folicur OR Inspire Super /GSB

Quintec or Torino or Endura or Procure or Rally/POW Presidio, Revus or Zampro/DOW or PCAP

copper fungicide/BFB

Presidio, Revus or Zampro/DOW or PCAP

Folicur OR Inspire Super/GSB

Topsin + mancozeb OR Inspire Super/ANTH + GSB Presidio or Revus/DOW or PCAP

1

Chlorothalonil (Bravo, Echo, Equus, etc…) may cause rind burn if sprayed within 21 day of harvest. 2

Actigard and/or Copper is used prior to fruit set if bacterial fruit blotch is an issue. 3

Folicur (any tebuconazole) should be used at 8.0 fl oz when sprayed each time with a seasonal limit of 24 fl oz. 4

Be mindful of preharvest intervals (PHIs) for later sprays as many may have a 7-14 day PHI.

a

Disease Acronyms: BFB = bacterial fruit blotch; GSB = gummy stem blight; POW = powdery mildew;

DOW = downy mildew; ANTH = anthracnose; PCAP = Phytophthora crown and fruit rot.

(13)

EFFICACY OF FUNGICIDES/B ACTERICIDES AGAINST TOMATO DISEASES 1

REGISTERED FUNGICIDES2 DISEASES B ac ter ial c an k er C la vi b a ct er m ic h ig a n en si s B ac ter ial s p ec k P se u do m o n a s s yr in g a e p v . to m a to B ac ter ial s p o t X a n th o m o n a s ca m p str is p v . ves ica to ri a B o tr ty ti s g ra y m o ld a n d S cl er o ti n ia C ry st u lar iel la l eaf s p o t T ar g et s po t E ar ly b li g h t L ate b li g h t P o w d er y m il d ew S ep to ri a l eaf s p o t S o ut he rn s te m r o t S cle ro tiu m r o lfs ii P y th iu m c o lla r ro t T o m at o S p o tt ed W ilt V ir u s Endura (boscalid) N N N G P G E N U P U N N Fontelis (penthiopyrad) N N N G P G E N U P G N N

Cabrio (pyraclostrobin) N N N P U G E G-F E-G E-G G P N Quadris/Amistar (azoxystrobin) N N N P U U E G-F E-G E-G G P N Flint (trifloxystrobin) N N N P U U E G-F E-G E-G G P N

Ranman (cyazofamid) N N N N N N F G N N N U N

Presidio (fluopicolide) N N N N N N N G N N N U N

Zampro (ametoctradin = dimethomorph) N N N N N N N G N N N U N Revus Top (mandipropamid + difenoconazole) N N N N N N F G U U U N N Previcur Flex (propamocarb) N N N N N N N G-F N N N P N

Aliette (fosetyl – Al) N N N N N N N F N N N N N

Forum (dimethomorph) N N N N N N N GC N N N N N

Gavel (zoxamide + mancozeb) N N N N N N G-F G-F N G-F N N N Tanos (famoxate + cymoxanil) P P P N U F E-G G P P N N N

Reason (fenamidone) N N N N U U G G N F N N N

Switch (cyprodinil + fludioxinil) N N N G U U G N G U N N N Ridomil Gold Bravo (mefenoxam + chlorothalonil) N N N F P F G GR P G N F-P N Ridomil Gold MZ (mefenoxam + mancozeb) P P P P P G P GR P F N F-P N Ridomil Gold Copper (meneoxam + Cu hydroxide) G-F G-F G-F P P P P GR P P N F-P N Rildomil Gold SC (mefenoxam) N N N N N N N N N N N G N

Rally (myclobutanil) N N N N E-G N N N E N N N N

Actigard (acibenzolar-S-methyl)3 _U _G-F _G-F _P _P _P _P _F-P _P _P _P _P _F-P

Maneb/mancozeb P P P P P G P G-F P G-F P P P

Bravo/Equus (chlorothalonil) N N N F P F G GR P G N F-P N

Scala (pyrimethanil) N N N GR U N G P P P N N N

Streptomycin sulfate2 _GR _GR _GR _N _N _N _N _N _N _N _N _N _N

1 Information in this table was mostly taken from ratings developed at the 2009 Southeast Vegetable Workers Conference in Fletcher, NC. Ratings for products do not necessarily indicate a labeled use.

2 Streptomycin may only be used i n plant beds, not registered for field use. 3 Phytotoxicity observed. Follow label carefully.

C = When used in combination with other fungicides/bactericides such as chlorothalonil and mancozeb, V = Variable levels of control. R = Pathogen resistance (insensitivity) may be present at some locations, E = Excellent disease suppression, G = Good disease suppression, F = Fair disease suppression, P = Poor to no disease suppression, U = Unknown efficacy

Vegetable Disease Control Schedules

David B. Langston, Jr.

Extension Vegetable Pathologist – University of Georgia