Disease Control : New England Vegetable Management Guide : UMass Amherst

Pumpkin, Squash & Gourds - General Pumpkin, Squash & Gourds Insect Control Pumpkin, Squash & Gourds Weed Control

Angular Leaf Spot (Pseudomonas syringae pv. lachrymans)

See the Cucumber, Muskmelon, and Watermelon disease control section for information on angular leaf spot.

FRAC Group BM02:

Bacillus subtilis strain QST713 (Serenade ASO^OG): 2 to 4 qt/A; PHI 0d, REI 4h.

FRAC Group M01:

copper hydroxide (Kocide 3000): 0.5 to 1.25 lb/A; PHI 0d, REI 48h. Do not apply in a spray solution having a pH of less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-O^OG).
copper octanoate (Cueva^OG): 33 gal/A; PHI 0d, REI 4h.

FRAC Group P01:

acibenzolar-s-methyl (Actigard 50WG): 0.5 to 2 oz/A; PHI 0d, REI 12h. Apply to healthy, actively growing plants.

Anthracnose (Colletotrichum), Alternaria Leaf Spot, and Black Rot (Stagonosporopsis spp., formerly Didymella bryoniae)

See the Cucumber, Muskmelon, and Watermelon disease control section for information on these diseases.

FRAC Group 1:

thiophanate-methyl (Topsin M WSB): 0.5 lb/A; PHI 1d, REI 24h. Consecutive use of Topsin M may lead to buildup of resistant strains of fungi and loss of disease control. May be tank mixed with chlorothalonil or mancozeb. GSB and anthracnose only.

FRAC Group 3:

azoxystrobin + difenoconazole (Quadris Top): 12 to14 fl oz/A; PHI 1d, REI 12h, Groups 11 & 3.
difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.
flutriafol (Rhyme): 5 to 7 fl oz/A; PHI 0d, REI 12h, Group 3. Black rot and anthracnose only

FRAC Group 7:

boscalid (Endura): 6.5 oz/A; PHI 0d, REI 12h.
difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
fluxapyroxad + pyraclostrobin (Merivon): 4 to 5.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 11.
penthiopyrad (Fontelis): 12 to 16 fl oz/A; PHI 1d, REI 12h. Black rot and Alternaria only. Can be tank-mixed with a minimum of 1.5 lb/A chlorothalonil.
pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7. Use caution in the addition of adjuvants or additives.

FRAC Group 9:

cyprodinil + fludioxonil (Switch 62.5 WG): 11 to 14 oz/A; PHI 1d, REI 12h, Groups 9 & 12. Black rot and Alternaria only. Good coverage is essential for good disease control.
difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.

FRAC Group 11:

azoxystrobin (Quadris F): 11 to 15.5 fl oz/A; PHI 1d, REI 4h. Do not alternate with other Group 11 fungicides. Resistant isolates of black rot have been reported.
azoxystrobin + chlorothalonil (Quadris Opti): 3.2 pt/A; PHI 1d, REI 12h, Groups 11 & M05.
famoxadone + cymoxanil (Tanos): 8 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Tank mix with an appropriate contact fungicide from a different FRAC Group. Alternaria and anthracnose only.
fenamidone (Reason 500 SC): 5.5 fl oz/A; PHI 14d, REI 12h. For Alternaria only. Do not rotate with other Group 11 fungicides.
fluxapyroxad + pyraclostrobin (Merivon): 4 to 5.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 11.
pyraclostrobin (Cabrio EG): 12 to 16 oz/A; PHI 0d, REI 12h. Do not make more than 1 application of Cabrio before alternating to a fungicide from a different FRAC Group.
pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7. Use caution in the addition of adjuvants or additives.

FRAC Group 12:

cyprodinil + fludioxonil (Switch 62.5 WG): 11 to 14 oz/A; PHI 1d, REI 12h, Groups 9 & 12. Black rot and Alternaria only. Good coverage is essential for good disease control.

FRAC Group 19:

polyoxin D zinc salt (Oso 5%SC): 6.5 to 13 fl oz/A; PHI 0d, REI 4h.

FRAC Group 22:

zoxamide + chlorothalonil (Zing!): 30 to 36 fl oz/A; PHI 0d, REI 12h, Groups 22 & M05. Do not combine with anything other than water.

FRAC Group 27:

cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 1.9 to 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.
famoxadone + cymoxanil (Tanos): 8 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Tank mix with an appropriate contact fungicide from a different FRAC Group. Alternaria and anthracnose only.

FRAC Group 49:

chlorothalonil + oxathiapiprolin (Orondis Opti): 1.75 to 5 pt/A; PHI 0d, REI 12h, Groups M05 & 49. For enhanced control, add a chlorothalonil-containing product to the spray mixture.

FRAC Group BM02:

Bacillus subtilis strain QST 713 (Serenade ASO^OG): 2 to 4 qt/A; PHI 0d, REI 4h. See label for tank mixing precautions.

FRAC Group M01:

copper hydroxide (Champ Formula 2F): 1.33 pt/A; PHI 0d, REI 48h. Labels vary with manufacturer and formulation. REI for products ranges from 4h to 48 hr. See label for crop injury warning.

FRAC Group M05:

chlorothalonil (Bravo Weather Stik): 1.5 to 3 pt/A; PHI 0d, REI 12h. Rates vary for each disease.
chlorothalonil + oxathiapiprolin (Orondis Opti): 1.75 to 5 pt/A; PHI 0d, REI 12h, Groups M05 & 49. For enhanced control, add a chlorothalonil-containing product to the spray mixture.
chlorothalonil + potassium phosphite (Catamaran): 4 to 6 pt/A; PHI 1d, REI 12h, Groups M05 & P07. Do not apply under drought conditions or conditions conducive to sunburn.
cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 1.9 to 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.
zoxamide + chlorothalonil (Zing!): 30 to 36 fl oz/A; PHI 0d, REI 12h, Groups 22 & M05. Do not combine with anything other than water.

FRAC Group P05:

Reynoutria sachalinensis extract (Regalia ^OG): 0.5 to 4 qt/A foliar or ground application; PHI 0d, REI 4h. Apply to ensure thorough coverage.

FRAC Group P06:

Bacillus mycoides Isolate J (LifeGard WG^OG): 4.5 oz/100 gal water; PHI 0d, REI 4h. GSB and anthracnose only.

FRAC Group P07:

chlorothalonil + potassium phosphite (Catamaran): 4 to 6 pt/A; PHI 1d, REI 12h, Groups M05 & P07. Do not apply under drought conditions or conditions conducive to sunburn.

Bacterial Wilt (Erwinia tracheiphila)

Cucumber beetles transmit bacterial wilt. Symptoms of this disease include dull green foliage and wilting during the day, often with recovery at night. Wilting begins at the tip and progresses down the vine. Leaves eventually turn yellow and brown at the margins and die back. The disease is less common in pumpkins and squash, and it typically progresses more slowly in these crops than it does in cucumbers. Remove and destroy infected plants. There are a few resistant cultivars of cucumber. Spunbonded row covers will exclude beetles. Plant a sprayed perimeter trap crop of Blue Hubbard squash to protect more susceptible crops. Dipping transplants into a kaolin solution will provide some protection as an antifeedant. Use crop rotation to reduce beetle numbers. Because cucumber beetles transmit this bacterium systemically, bactericide sprays are not effective. Cucumber beetles must be controlled by appropriate insecticide programs. Scout twice weekly at seedling stage for cucumber beetles. Treat when beetle numbers reach the threshold of 1 beetle per 100 feet of row. See the Cucumber, Muskmelon, and Watermelon insect control section for more information on striped cucumber beetle.

Cucurbit Viruses: CMV, WMV-II, PRSV-W and ZYMV

See the Cucumber, Muskmelon, and Watermelon disease control section for information on cucurbit viruses.

Downy Mildew (Pseudoperonospora cubensis)

Pseudoperonospora cubensis only infects members of the cucurbit family and is an obligate parasite. Its survival depends on the presence of living cucurbit hosts, either in climates that permit their growth year-round or in greenhouse culture. The source of primary inoculum in cold climates is windblown sporangia from areas where plants survive the cold season. Generally, downy mildew of cucurbits arrives in southern New England in mid- to late summer. The progress of downy mildew is tracked by the North American Plant Disease Forecast Center (http://cdm.ipmpipe.org/). Symptoms of downy mildew include small, angular lesions on the foliage which are confined by leaf veins. These lesions later develop into darker necrotic spots and usually develop grey fuzzy fungal growth on the undersides of the leaves. Physiological specialization occurs in P. cubensis, and several pathotypes and races have been described. Spread of downy mildew can occur over long distances by air currents and moves within a field via wind-dispersed sporangia. The main means of control are fungicide applications, the use of resistant cultivars, and cultural practices. Maximum control can be achieved only with a combination of these measures. Plant in well-drained soil. Use proper plant spacing to reduce the density of the plant canopy and avoid overhead irrigation to minimize the length of leaf wetness periods. A few pumpkin cultivars have partial resistance to downy mildew. P. cubensis is an oomycete and will not be controlled by the same fungicides that control true fungi.

FRAC Group 7:

pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7. Use caution in the addition of adjuvants or additives.

FRAC Group 11:

azoxystrobin (Quadris F): 11 to 15.5 fl oz/A; PHI 1d, REI 4h. Do not alternate with other Group 11 fungicides.
famoxadone + cymoxanil (Tanos): 8 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Tank mix with an appropriate contact fungicide.
fenamidone (Reason 500 SC): 5.5 fl oz/A; PHI 14d, REI 12h. Do not rotate with other Group 11 fungicides.
pyraclostrobin (Cabrio EG): 8 to 12 oz/A; PHI 0d, REI 12h.
pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7. Use caution in the addition of adjuvants or additives.
trifloxystrobin (Flint): 4 fl oz/A; PHI 0d, REI 12h. Do not rotate with another Group 11 fungicide. Suppression only.

FRAC Group 21:

cyazofamid (Ranman 400SC): 2.1 to 2.75 fl oz/A; PHI 0d, REI 12h. Tank mix with an organosilicone surfactant or non-ionic surfactant. Alternate sprays of Ranman with fungicide from a different FRAC Group.

FRAC Group 22:

ethaboxam (Elumin): 8 fl oz/A; PHI 2d, REI 12h.
zoxamide + mancozeb (Gavel 75DF): 1.5 to 2 lb/A; PHI 5d, REI 48h, Groups 22 & M03. Do not tank mix with another Group M3 fungicide if the target pest is only downy mildew. Tank-mix only if a partner is required to control other diseases, such as copper for bacterial disease.

FRAC Group 27:

cymoxanil (Curzate 60 DF): 3.2 to 5 oz/A; PHI 3d, REI 12h. Use only in combination with protectant fungicide (e.g., copper, chlorothalonil).
cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 1.9 to 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.
famoxadone + cymoxanil (Tanos): 8 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Tank mix with an appropriate contact fungicide.

FRAC Group 28:

propamocarb HCl (Previcur Flex): 1.2 pt/A; PHI 2d, REI 12h. Alternate with a contact fungicide (e.g., copper, chlorothalonil).

FRAC Group 40:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 0d, REI 12h, Groups 45 & 40.
dimethomorph (Forum): 6 fl oz/A; PHI 0d, REI 12h. Apply only in combination with a labeled rate of another non-Group 40 fungicide.
oxathiapiprolin + mandipropamid (Orondis Ultra): 5.5 to 8 fl oz/A; PHI 0d, REI 4h, Groups 49 & 40.

FRAC Group 45:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 0d, REI 12h, Groups 45 & 40.

FRAC Group 49:

oxathiapiprolin (Orondis Opti A): 2 to 4.8 fl oz/A; PHI 0d, REI 4h.
oxathiapiprolin + mandipropamid (Orondis Ultra): 5.5 to 8 fl oz/A; PHI 0d, REI 4h, Groups 49 & 40.

FRAC Group BM02:

Bacillus subtilis strain QST 713 (Serenade ASO^OG): 2 to 4 qt/A; PHI 0d, REI 4h. See label for tank mixing precautions.

FRAC Group M01:

copper hydroxide (Kocide 3000): 0.5 to 1.25 lb/A; PHI 0d, REI 48h for field use, 24h for greenhouse use. Do not apply in a spray solution having a pH of less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-O^OG).
copper oxychloride + copper hydroxide (Badge SC): 0.5 to 2.5 lb/A; PHI 0d, REI 24h (greenhouse) 48h (field). Crop injury may occur from application at higher rates and shorter intervals. Tank mixes with foliar applied fertilizers during periods of excessive heat can result in crop injury.

FRAC Group M03:

mancozeb (Dithane F45): 1.6 to 2.4 qt/A; PHI 5d, REI 24h. Do not tank mix with copper.
zoxamide + mancozeb (Gavel 75DF): 1.5 to 2 lb/A; PHI 5d, REI 48h, Groups 22 & M03. Do not tank mix with another Group M3 fungicide if the target pest is only downy mildew. Tank-mix only if a partner is required to control other diseases, such as copper for bacterial disease.

FRAC Group M05:

chlorothalonil (Bravo Weather Stik): 1.5 to 2 pt/A; PHI 0d, REI 12h.
chlorothalonil + oxathiapiprolin (Orondis Opti): 1.75 to 5 pt/A; PHI 0d, REI 12h, Groups M05 & 49.
cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 1.9 to 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.
zoxamide + chlorothalonil (Zing!): 30 to 36 fl oz/A; PHI 0d, REI 12h, Groups 22 & M05. Do not combine with anything other than water.

FRAC Group P05:

Reynoutria sachalinensis extract (Regalia ^OG): 1 to 4 qt/A, foliar or ground application; PHI 0d, REI 4h. Apply to ensure thorough coverage. Apply with another fungicide for downy mildew.

FRAC Group P06:

Bacillus mycoides Isolate J (LifeGard WG^OG): 4.5 oz/100 gal water; PHI 0d, REI 4h.

FRAC Group P07:

fosetyl Al (Aliette WDG): 2 to 5 lb/A; PHI 0d (12h), REI 24h. Do not tank mix with copper.
phosphorous acid (Fosphite): 1 to 3 qt/20 gal water/A; PHI 0d, REI 4h. Do not apply to plants that are heat- or moisture-stressed. Copper phytotoxicity may occur.

Phytophthora Blight and Fruit Rot (Phytophthora capsici)

See the Cucumber, Muskmelon, and Watermelon disease control section for information on Phytophthora blight.

FRAC Group 11:

famoxadone + cymoxanil (Tanos): 8 to 10 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Suppression of foliar and fruit phase only. Tank mix with an appropriate contact fungicide from a different FRAC Group (e.g., copper or chlorothalonil).

FRAC Group 21:

cyazofamid (Ranman 400SC): 2.75 fl oz/A; PHI 0d, REI 12h. Mix with a surfactant for best results. Alternate with a fungicide from a different FRAC Group.

FRAC Group 22:

ethaboxam (Elumin): 8 fl oz/A; PHI 2d, REI 12h. Soil or foliar applications.
zoxamide + mancozeb (Gavel 75DF): 1.5 to 2 lb/A; PHI 5d, REI 48h, Groups 22 & M03. Do not tank-mix with another Group-M3 fungicide if the target pest is only Phytophthora blight. Tank-mix only if a partner is required to control other diseases, such as copper for bacterial disease.

FRAC Group 27:

famoxadone + cymoxanil (Tanos): 8 to 10 oz/A; PHI 3d, REI 12h, Groups 11 & 27. Suppression of foliar and fruit phase only. Tank mix with an appropriate contact fungicide from a different FRAC Group (e.g., copper or chlorothalonil).

FRAC Group 29:

fluazinam (Omega 500F): 12 to 24 fl oz/A; PHI 7d, REI 12h.

FRAC Group 40:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 0d, REI 12h, Groups 45 & 40.
dimethomorph (Forum): 6 fl oz/A; PHI 0d, REI 12h. Apply only in combination with a labeled rate of another non-Group 40 fungicide.
oxathiapiprolin + mandipropamid (Orondis Ultra): 5.5 to 8 fl oz/A; PHI 0d, REI 4h, Groups 49 & 40.

FRAC Group 43:

fluopicolide (Presidio 4SC): 4 fl oz/A; PHI 2d, REI 12h. Must be tank mixed with another fungicide from a different FRAC Group.

FRAC Group 45:

ametoctradin + dimethomorph (Zampro): 14 fl oz/A; PHI 0d, REI 12h, Groups 45 & 40.

FRAC Group 49:

oxathiapiprolin + mandipropamid (Orondis Ultra): 5.5 to 8 fl oz/A; PHI 0d, REI 4h, Groups 49 & 40.

FRAC Group BM02:

Bacillus subtilis strain QST 713 (Serenade ASO^OG): 2 to 4 qt/A; PHI 0d, REI 4h. See label for tank mixing precautions.

FRAC Group M03:

zoxamide + mancozeb (Gavel 75DF): 1.5 to 2 lb/A; PHI 5d, REI 48h, Groups 22 & M03. Do not tank-mix with another Group-M3 fungicide if the target pest is only Phytophthora blight. Tank-mix only if a partner is required to control other diseases, such as copper for bacterial disease.

FRAC Group P05:

Reynoutria sachalinensis extract (Regalia^OG): 1 to 4 qt/A, foliar or ground application; PHI 0d, REI 4h. Apply to ensure thorough coverage.

FRAC Group P07:

phosphorous acid (Fosphite): 1 to 3 qt/20 gal water/A; PHI 0d, REI 4h. Do not apply to plants that are heat- or moisture-stressed. Copper phytotoxicity may occur if applied in alteration with copper.
fosetyl-Al (Aliette WDG): 2 to 5 lb/A; PHI 12h, REI 24h. Do not tank mix with copper compounds. Use the high rate when Phytophthora blight is active.

Plectosporium Blight (Plectosporium tabacinum)

Lesions of Plectosporium blight are most often observed on the stems of affected plants and can be small, irregularly shaped, and often coalesce to form a scabby whitish or tan area. Fruit lesions can be confused with edema. When Plectosporium blight occurs, rotate away from summer squash, muskmelons, and pumpkins for 2 years. Choose sunny, well-drained sites for planting cucurbits. Scout for disease and apply fungicides when disease first occurs. Thorough fungicide coverage of foliage, vines, and fruit is necessary for good control. The strobilurin (QoI, FRAC Group 11) fungicides Flint (trifloxystrobin), Cabrio (pyraclostrobin), and Quadris (azoxystrobin) will control this disease but should not be rotated with each other or the pathogen will develop resistance. Apply a protectant fungicide such as chlorothalonil (Bravo) or mancozeb (Dithane) following a strobilurin.

FRAC Group 3:

azoxystrobin + difenoconazole (Quadris Top): 12 to 14 fl oz/A; PHI 1d, REI 12h, Groups 11 & 3. Do not rotate with another Group 11 fungicide.
difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.

FRAC Group 7:

difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
fluxapyroxad + pyraclostrobin (Merivon): 5.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 11.

FRAC Group 9:

difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.

FRAC Group 11:

azoxystrobin + difenoconazole (Quadris Top): 12 to 14 fl oz/A; PHI 1d, REI 12h, Groups 11 & 3. Do not rotate with another Group 11 fungicide.
fluxapyroxad + pyraclostrobin (Merivon): 5.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 11.
pyraclostrobin (Cabrio EG): 12 to 16 oz/A; PHI 0d, REI 12h. Do not rotate with other Group 11 fungicides.
trifloxystrobin (Flint): 1.5 to 2 oz/A; PHI 0d, REI 12h. Do not rotate with other Group 11 fungicides.

Postharvest Fruit Rot (Various Fungi)

Fruit and stem rot that develop after harvest is generally due to infection that took place in the field. Postharvest rot can be reduced by applying fungicides during the growing season on a regular basis, as for control of black rot. Control weeds to allow better air circulation. Wounds to the fruit that occur during harvest can also result in postharvest rot. For maximum storage life, refer to Postharvest Handling and Storage in the Cultural Practices section.

Powdery Mildew (Podosphaera and Golovinomyces spp.)

See the Cucumber, Muskmelon, and Watermelon disease control section for information on powdery mildew.

FRAC Group 3:

difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.
flutriafol (Rhyme): 5 to 7 fl oz/A; PHI 0d, REI 12h. See label for surfactant recommendations and restrictions.
myclobutanil (Rally 40WSP): 2.5 to 5 oz/A; PHI 0d, REI 24h. Observe a 30-day plant back interval.
triflumizole (Procure 480SC): 4 to 8 fl oz/A; PHI 0d, REI 12h. Use at the highest rate to prevent resistance development.

FRAC Group 7:

penthiopyrad (Fontelis): 12 to 160 fl oz/A; PHI 1d, REI 12h.
pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7.

FRAC Group 9:

difenoconazole + cyprodinil (Inspire Super): 16 to 20 fl oz/A; PHI 7d, REI 12h, Groups 3 & 9. Apply in sufficient volume to achieve thorough coverage.
cyprodinil + fludioxonil (Switch 62.5 WG): 11 to 14 oz/A; PHI 1d, REI 12h, Groups 9 & 12. Good coverage is essential for good disease control. Use a minimum of 10 gallons/A spray volume.

FRAC Group 11:

pyraclostrobin + boscalid (Pristine): 12.5 to 18.5 oz/A; PHI 0d, REI 12h, Groups 11 & 7.

FRAC Group 12:

cyprodinil + fludioxonil (Switch 62.5 WG): 11 to 14 oz/A; PHI 1d, REI 12h, Groups 9 & 12. Good coverage is essential for good disease control. Use a minimum of 10 gallons/A spray volume.

FRAC Group 13:

quinoxyfen (Quintec): 4 to 8 fl oz/A; PHI 3d, REI 12h. Tank mix with a protectant fungicide. Alternate with a non-Group 13 fungicide. Not labeled for use on edible-peel cucurbits.

FRAC Group 19:

polyoxin D (OSO 5%SC^OG): 6.5 to 13 fl oz/A; PHI 0d, REI 4h.

FRAC Group 27:

cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.

FRAC Group 50:

metrafenone (Vivando): 10.3 to 15.4 fl oz/A; PHI 0d, REI 12h. Must be applied before symptoms appear. For established infections, apply in a tank mix with curative fungicide. Do not mix with horticultural oil.

FRAC Group BM02:

Bacillus amyloliquefaciens strain D747 (DoubleNickel 55^OG): 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.

FRAC Group M01:

copper compound (Champ Formula 2F): 1.33 pt/A; PHI 0d, REI 48h. Labels vary with manufacturer and formulation. REI for products ranges from 4h to 48 hr. See label for crop injury warning.
copper hydroxide (Kocide 3000): 0.5 to 1.25 lb/A; PHI 0d, REI 48h. Do not apply in a spray solution having a pH of less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-O^OG).

FRAC Group M02:

sulfur (Microthiol Disperss^OG): 5 to 10 lb/A; PHI 0d, REI 24h. Sulfur can injure plants, especially when temperatures reach 90°F. Do not apply to sulfur-sensitive varieties.

FRAC Group M05:

chlorothalonil (Bravo Weather Stik): 2 to 3 pt/A; PHI 0d, REI 12h.
cymoxanil + chlorothalonil (ECHO 459, aka Ariston): 3 pt/A; PHI 3d, REI 12h, Groups 27 & M05.

FRAC Group NC:

neem botanical oil (Trilogy ^OG): 0.5% to 1% solution/A; PHI 0d, REI 4h. Thorough coverage is essential.
paraffinic (mineral oil) (JMS Stylet-Oil^OG): 3 to 6 qt/100 gal water; PHI 0d, REI 4h. Spray for thorough coverage of upper leaf surface.
potassium bicarbonate (Kaligreen^OG): 2.5 to 5 lb/A; PHI 1d, REI 4h.

FRAC Group P05:

Reynoutria sachalinensis extract (Regalia^OG): 1 to 4 qt/A, foliar or ground application; PHI 0d, REI 4h. Use preventatively, before any disease development. Apply to ensure thorough coverage. Recommended to mix with a mobile fungicide.

FRAC Group P06:

Bacillus mycoides Isolate J (BmJ WG^OG, aka LifeGard^OG): 4.5 oz/100 gal water; PHI 0d, REI 4h.

FRAC Group P07:

monopotassium phosphate (Nutrol): 10 to 20 lb/A; PHI 0d, REI 4h. Apply 2–4 sprays beginning at fruit set. Use a maximum of 3 lb product/10 gal spray solution.

FRAC Group U06:

cyflufenamid (Torino): 3.4 oz/A; PHI 0d, REI 4h.

Scab (Cladosporium cucumerinum)

See the Cucumber, Muskmelon, and Watermelon disease control section for information on scab.

FRAC Group 3:

difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.

FRAC Group 7:

difenoconazole + benzovindiflupyr (Aprovia Top): 8.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.

FRAC Group 19:

polyoxin D zinc salt (OSO 5%SC^OG): 6.5 to 13 fl oz/A; PHI 0d, REI 4h. Mix in sufficient water to ensure thorough coverage.

FRAC Group M05:

chlorothalonil (Bravo Weather Stik): 2 to 3 lb/A; PHI 0d, REI 12h.
chlorothalonil + potassium phosphite (Catamaran): 6 pt/A; PHI 1d, REI 12, Groups M05 & P07. Do not apply under drought conditions or conditions conducive to sunburn.

FRAC Group P07:

chlorothalonil + potassium phosphite (Catamaran): 6 pt/A; PHI 1d, REI 12, Groups M05 & P07. Do not apply under drought conditions or conditions conducive to sunburn.