Disease Control

Okra - General Okra Insect Control Okra Weed Control

Cercospora Leaf Spots (Cercospora spp.)

This disease typically appears as small, round, tan lesions with reddish borders. Lesions may coalesce, causing leaf blight and defoliation. The fungus survives on infected plant debris. Use proper plant spacing to optimize airflow and sun exposure. Remove and destroy diseased plant material. Plow crop debris under after harvest to speed up decomposition.

FRAC Group 3:

  • azoxystrobin + difenoconazole (Quadris Top): 8 to 14 fl oz/A; PHI 0d, REI 12h, Groups 11 & 3.
  • difenoconazole + benzovindiflupyr (Aprovia Top): 10.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 3.
  • difenoconazole + fluopyram (Luna Flex): 8 to 13.6 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
  • flutriafol + azoxystrobin (TopGuard EQ): 4 to 8 fl oz/A; PHI 0d, REI 12h, Group 3 & 11. 
  • tebuconazole (Orius 3.6F): 4 to 6 fl oz/A; PHI 3d, REI 12h. 
  • tebuconazole +  fluopyram (Luna Experience): 12.8 fl oz/A; PHI 3d, REI 12h, Groups 3 & 7. 

FRAC Group 7:

  • difenoconazole + benzovindiflupyr (Aprovia Top): 10.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 7 & 3.
  • difenoconazole + fluopyram (Luna Flex): 8 to 13.6 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
  • tebuconazole + fluopyram (Luna Experience): 12.8 fl oz/A; PHI 3d, REI 12h, Groups 3 & 7. 

FRAC Group 11:

  • azoxystrobin + difenoconazole (Quadris Top): 8 to 14 fl oz/A; PHI 0d, REI 12h, Groups 11 & 3.
  • flutriafol + azoxystrobin (TopGuard EQ): 4 to 8 fl oz/A; PHI 0d, REI 12h, Group 3 & 11. 

FRAC Group 22:

  • chlorothalonil + cymoxanil (Ariston Echo 459/Cymoxanil 61): 2 to 2.44 pints/A; PHI 3d, REI 12h, Groups M05 & 27.

FRAC Group 27:

  • chlorothalonil + cymoxanil (Ariston Echo 459/Cymoxanil 61): 2 to 2.44 pints/A; PHI 3d, REI 12h, Groups M05 & 27.

FRAC Group BM02:

  • Bacillus amyloliquefaciens strain D747 (Double Nickel 55OG): 0.125 to 1 lb/A (soil), 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.

FRAC Group M01:

  • copper hydroxide (Kocide 3000): 0.75 to 1.75 lb/A; PHI 0d, REI 48h. Do not apply in a spray solution with a pH less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-OOG).
  • copper octanoate (CuevaOG): 33 gal/A; PHI 0d, REI 4h.

FRAC Group M02: 

  • sulfur (Microthiol DisperssOG): 3 to 10 lb/A; PHI 0d, REI 24h. Begin application at early leaf stage. 

FRAC Group M05: 

  • chlorothalonil (Bravo Weather Stik): 1.5 pt/A; PHI 3d, REI 12h.
  • chlorothalonil + cymoxanil (Ariston Echo 459/Cymoxanil 61): 2 to 2.44 pints/A; PHI 3d, REI 12h, Groups M05 & 27.
  • chlorothalonil + zoxamide (Zing!): 34 fl oz/A; PHI 3d, REI 12h, Groups 22 & M05. Begin application when seedlings emerge or transplants are set. 

Damping-off (Pythium spp. and Rhizoctonia solani)

Damping-off diseases are favored by flooding, cool, cloudy weather, wet soils, high humidity, compacted soils, and overcrowding. Sterilize used pots and trays to raise seedlings. Use a heating pad under trays to warm soil to 75-90°F for indoor plant production. Avoid excessive irrigation, improve soil drainage, and relieve soil compaction. Remove and destroy affected plants and avoid transplanting diseased plants into the field. Seed treatments with biological control agents or fungicides are useful.

FRAC Group 4:

  • mefenoxam (Apron XL LS): 0.085 to 0.64 fl oz/100 lb seed; REI 48h. Seed treatment. Labeled for Pythium. 

FRAC Group 11:

  • azoxystrobin (Quadris F): 0.4 to 0.8 fl oz/1000 row feet; PHI 0d, REI 4h.

FRAC Group 21:

  • cyazofamid (Ranman 400SC): 2.1 to 2.75 fl oz/A; PHI 0d, REI 12h. 

FRAC Group 22:

  • ethaboxam (Elumin): 8 fl oz/A; PHI 2d, REI 12h. Do not apply more than once before rotating to a non-Group 22 fungicide. 

FRAC Group 28:

  • propamocarb HCL (Previcur Flex): 1.2 pt/A; PHI 5d, REI 12h.

FRAC Group BM02:

  • Bacillus amyloliquefaciens strain D747 (Double Nickel 55OG): 0.125 to 1 lb/A (soil), 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.
  • Pseudomonas chlororaphis strain AFS009 (Howler EVOOG): 2.5 to 7.5 lb/A; PHI 0d, REI 4h. Use preventatively. 

FRAC Group M03:

  • thiram (Thiram 42-S): 6 lb/100 lb seed; REI 24h.

FRAC Group P07:

  • salts of 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.

Fruit Rot (Choanephora spp.)

Choanephora is a soilborne pathogen that attacks senescent blossoms and grows into the fruit. The fungus appears as a very fuzzy white to grayish growth on affected fruit. No fungicides are currently labeled for control. Improve air circulation and sun exposure with increased plant spacing.

Nematodes

Nematode feeding damages plant roots, resulting in wilting, stunting, and decreased yield. The roots of affected plants are stunted and diminished. If root knot nematodes are present, root galls may be present. Nematode control is especially important for okra production. Fumigate fields in the fall. See Soil Fumigation Outdoors in the Disease Management Section. Rotate with corn.

FRAC Group 7:

  • fluopyram (Velum Prime): 3 to 6.84 fl oz/A; PHI 0d, REI 12h, Group 7. 

FRAC Group UN:

  • azadirachtin (AzaGuardOG): 15 fl oz/A; PHI 0d, REI 4h, Group UN. 

FRAC Group NC:

  • Myrothecium verrucaria strain AARC-0255 (DiTera DF Nematicide): 0.31 to 2.4 lb/1000 sq ft; REI 4h, Group NC.

Okra Yellow Vein Mosaic Virus (OYVMV)

OYVMD is caused by a group of viruses, all of which are transmitted by whiteflies. This disease reduces growth and yield as well as causing fruit yellowing and deformity. Stunted growth and yellowing of leaf veins are also observed. There are no cures or chemical treatments for plant viruses. Remove and destroy affected plants. Plant resistant varieties. Control whiteflies to reduce disease incidence.

Powdery mildew (Golovinomyces (syn. Erysiphe) spp.)

Powdery mildew is characterized by white, powdery fungal growth on the leaves of host plants. Maintain plant health with adequate fertilization as nutrient-stressed plants are more susceptible to infection. Rotate between fungicides to minimize risk of resistance. Control weeds, especially those in the mallow family.

FRAC Group 3:

  • difenoconazole + benzovindiflupyr (Aprovia Top): 10.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
  • difenoconazole + cyprodinil (Inspire Super): 14 to 20 fl oz/A; PHI 0d, REI 12h, Groups 3 & 9. 
  • difenoconazole + fluopyram (Luna Flex): 8 to 13.6 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
  • flutriafol + azoxystrobin (TopGuard EQ): 4 to 8 fl oz/A; PHI 0d, REI 12h, Group 3 & 11. 
  • myclobutanil (Rally 40 WSP): 2.5 to 5 oz/A; PHI 0d, REI 24h. Do not make more than 4 applications per season. 
  • tetraconazole (Mettle 125ME): 6 to 8 fl oz/A; PHI 0d, REI 12h. Ensure thorough coverage.  

FRAC Group 7: 

  • difenoconazole + benzovindiflupyr (Aprovia Top): 10.5 to 13.5 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7. 
  • difenoconazole + fluopyram (Luna Flex): 8 to 13.6 fl oz/A; PHI 0d, REI 12h, Groups 3 & 7.
  • fluopyram (Velum Prime): 3 to 6.84 fl oz/A; PHI 0d, REI 12h, Group 7. 
  • penthiopyrad (Fontelis): 16 to 24 fl oz/A; PHI 0d, REI 12h. 
  • pydiflumetofen + fludioxonil (Miravis Prime): 6.5 to 11.4 fl oz/A, PHI 0d, REI 12h, Groups 7 & 12. Not for greenhouse use for this crop.
  • trifloxystrobin + fluopyram (Luna Sensation): 5 to 7.6 fl oz/A; PHI 3d, REI 12h, Groups 11 & 7. 

FRAC Group 9:

  • cyprodinil + fludioxonil (Switch 62.5 WDG): 11 to 14 oz/A; PHI 7d, REI 12h, Groups 9 & 12. 
  • difenoconazole + cyprodinil (Inspire Super): 14 to 20 fl oz/A; PHI 0d, REI 12h, Groups 3 & 9. 

FRAC Group 11:

  • azoxystrobin (Quadris F): 6 to 15.5 fl oz/A; PHI 0d, REI 4h. 
  • flutriafol + azoxystrobin (TopGuard EQ): 4 to 8 fl oz/A; PHI 0d, REI 12h, Group 3 & 11. 
  • trifloxystrobin + fluopyram (Luna Sensation): 5 to 7.6 fl oz/A; PHI 3d, REI 12h, Groups 11 & 7. 

FRAC Group 12:

  • cyprodinil + fludioxonil (Switch 62.5 WDG): 11 to 14 oz/A; PHI 7d, REI 12h, Groups 9 & 12. 
  • pydiflumetofen + fludioxonil (Miravis Prime): 6.5 to 11.4 fl oz/A, PHI 0d, REI 12h, Groups 7 & 12. Not for greenhouse use for this crop.

FRAC Group BM01:

  • thyme oil (Guarda): 1 gal/29–159 gal water (0.625%–3.3% v/v); PHI 0d, REI 0h.

FRAC Group BM02:

  • Bacillus amyloliquefaciens strain D747 (Double Nickel 55OG): 0.125 to 1 lb/A (soil), 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.
  • Pseudomonas chlororaphis strain AFS009 (Howler EVOOG): 2.5 to 7.5 lb/A; PHI 0d, REI 4h. Use preventatively. 

FRAC Group M01:

  • copper hydroxide (Kocide 3000): 0.75 to 1.75 lb/A; PHI 0d, REI 48h. Do not apply in a spray solution with a pH less than 6.5 or tank mix with Aliette. An OMRI-listed formulation is available (Kocide 3000-OOG).
  • copper octanoate (CuevaOG): 33 gal/A; PHI 0d, REI 4h.
  • copper oxychloride + copper hydroxide (Badge X2OG): 0.75 to 2.75 lb/A; PHI 0d, REI 24h. 

FRAC Group M02: 

  • sulfur (Microthiol DisperssOG): 3 to 10 lb/A; PHI 0d, REI 24h. 

FRAC Group NC:

  • paraffinic oil (JMS Stylet-Oil): 3 to 6 qt/100 gal water; PHI 0d, REI 4h. An organic formulation is available. 
  • potassium bicarbonate (MilStop SPOG): 2 to 5 lb/A (field); PHI 0d, REI 1h. 

FRAC Group P05:

  • Reynoutria sachalinensis extract (RegaliaOG): 1 to 4 qt/A; PHI 0d, REI 4h. 

Vascular Wilts (Fusarium oxysporum f. sp vasinfectum and Verticillium spp.)

Symptoms of vascular wilt diseases include stunting, yellowing, and browning of foliage. Plants may be seen to wilt on sunny afternoons and recover at night. Both species cause brown to black discoloration of the vascular system. Fungicides are marginally effective for vascular wilts, but they may be helpful as part of a comprehensive IPM program. Avoid planting in fields where these diseases are present. Rotate with non-host crops (non-solanaceous crops for Fusarium, corn and small grains for Verticillium) for at least 4 years. Plant resistant varieties when available. Consider soil fumigation. Soil solarization, fallowing, flooding, and biofumigation with brassica green manures may reduce soil populations of these pathogens. See Soil Fumigation Outdoors in the Disease Management Section.

FRAC Group 7:

  • fluopyram (Velum Prime): 3 to 6.84 fl oz/A; PHI 0d, REI 12h, Group 7. 

FRAC Group BM01:

  • thyme oil (Guarda): 1 gal/29–159 gal water (0.625%–3.3% v/v); PHI 0d, REI 0h.

FRAC Group BM02:

  • Bacillus amyloliquefaciens strain D747 (Double Nickel 55OG): 0.125 to 1 lb/A (soil), 0.25 to 3 lb/A (foliar); PHI 0d, REI 4h.

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New England Vegetable Management Guide