COLE CROPS/CRUCIFERS

Broccoli, Cabbage, Chinese Cabbage, Cauliflower, Choi Sum, Kai choy, Pak Choy

Author

John J. McHugh, Jr. and Ronald F.L. Mau

Department of Entomology

Honolulu, Hawaii

 

Table 1. Disease Control Recommendations.

Disease

Control Measure(s)

Comments

Alternaria leafspot Resistant/tolerant varieties.

Chlorothalonil (Bravo 720) at 1.5 pt. per acre OR maneb (Maneb 75DF) at 1.5 lb. per acre.

Check with seed breeders and suppliers.

Disease favored by cool moist conditions. Begin spraying at first sign of disease.

Chlorothalonil PHI = 0 days for head cabbage, broccoli, cauliflower, 7 days for Chinese cabbage or Chinese broccoli.

Maneb PHI = 7 days for head cabbage, broccoli, cauliflower, 10 days for Chinese cabbage.

Black leg Use clean and/or treated seed.

Crop rotation.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Seed-borne disease. Check with seed dealers for seed treatment.

3 year rotation to non-host crop if fields become infested.

Black rot Resistant/tolerant varieties.

Use clean and/or treated seed.

Copper sprays at labelled rates at first sign of disease symptoms.

Check with seed dealers. 'Augusta' especially tolerant at low elevations.

Seed-borne disease. Check with seed dealers for seed treatment.

Serious under rainy, humid conditions, overhead irrigation.

Club root Use clean and/or treated seed.

Crop rotation.

Maintain soil pH at 7.2 to 7.5 AND drench with PCNB (PCNB 75% wettable powder) at 15 to 20 lb. per acre as a broadcast drench at time of planting.

Seed-borne disease. Check with seed dealers for seed treatment.

Minimum 5 year rotation to non-host crop if fields become infested.

Avoid fields with history of club root.

Downy mildew Chlorothalonil (Bravo 720) at 1.5 pt. per acre OR maneb (Maneb 75DF) at 1.5 lb. per acre.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Protection of young seedlings/transplants most crucial stage.

Chlorothalonil PHI = 0 days for head cabbage, broccoli, cauliflower, 7 days for Chinese cabbage or Chinese broccoli.

Maneb PHI = 7 days for head cabbage, broccoli, cauliflower, 10 days for Chinese cabbage.

Sugarbeet cyst nematode Crop rotation.

Ethoprop (Mocap 10G or EC) at 50 lb. per acre for granular formulation or 3 1/3 qt. per acre for EC. For use in head cabbage only.

Fenimaphos (Nemacur 15G) at 7.3 to 18.4 oz. per 1000 ft. of row. For use in head cabbage only.

Rotate to non-host crops.

Mechanically incoporate ethoprop prior to planting.

Apply fenimaphos after transplant, incorporate with overhead irrigation.

Table 2. Insect and Mite Control Recommendations.

Insects/Mites

Control Measure(s)

Comments

Aphids (except for root aphid) Imidacloprid (Provado 1.6F) at 3.75 fl. oz. per acre.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Do not apply more than 18.75 fl. oz. per acre per year (5 applications).

PHI = 0 days.

Root aphid Disulfoton (Disyston 8 or 15G)at 1.7 fl. oz. per 1000 ft. of row for 8, 11.3 oz. per 1000 ft. of row for 15G. For broccoli, cauliflower, head cabbage only.

Imidacloprid (Admire 2F) at 24 fl. oz. per acre.

Disulfoton PHI = 14 days for broccoli, 40 days for cauliflower, 42 days for head cabbage.

Admire is a soil applied fungicide. Uniform coverage of planted areas is essential for control. PHI = 21 days.

Alternating disulfoton and imidacloprid can delay development of resistance to either insecticide.

Caterpillars:

Beet armyworm, cabbage looper, corn earworm, diamondback moth, imported cabbageworm, imported cabbage webworm

Spinosad (Success) at 3 to 6 fl. oz. per acre.

Bacillus thuringiensis var. kurstaki (Crymax) at 1.5 lb. per acre.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Spinosad PHI = 1 day; Crymax PHI = 0 days.

Resistance management by rotating pesticides, scouting, and the use of economic thresholds will maintain effectiveness of registered products.

Onion thrips Lamda-cyhalothrin (Warrior 1E or Karate) at 3.84 fl. oz. per acre. Broccoli and head cabbage only.

Spinosad (Success) at 6 fl. oz. per acre.

Resistant varieties.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Lamda-cyhalothrin PHI = 1 day.

Spinosad PHI = 0 days.

Resistant varieties include Augusta, Bravo, Little Rock. Check with seed dealers for availability.

Whiteflies (silverleaf whitely, sweet potato whitefly) Imidacloprid (Provado 1.6F) at 3.75 fl. oz. per acre.

See Hawaii Pesticide Information Retrieval System for Information on cole crops

Do not apply more than 18.75 fl. oz. per acre per year (5 applications).

PHI = 0 days.

Table 3. Weed Control Recommendations.

Control Measure(s)

Rates

Comments

Glyphosate (Roundup Ultra WS) or Paraquat (Gramoxone Extra 2.5E) Roundup Ultra WS at 0.5 - 10 pt. per acre (higher rates for difficult to kill weeds, for example, purple nutsedge).

Gramoxone Extra 2.5E at 1.5 to 3 pt. per acre.

Stale seedbed treatments.

Broad spectrum weed control

Napropamide (Devrinol 50-DF) 2 to 4 lb. per acre. Preplant incorporated/Preemergent.

Broadleaf + grass weed control.

Broccoli, head cabbage, cauliflower only.

Trifluralin (Trifluralin 4EC) 1 to 1.5 pt. per acre Preplant incorporate/Preemergent.

Broadleaf + grass weed control.

Broccoli, head cabbage, cauliflower only.

Oxyfluorfen (Goal 2XL) 1 to 2 pt. per acre. Pre-transplant/Preemergent.

Apply before transplanting.

Broadleaf weed control.

Broccoli, head cabbage, cauliflower only.

Sethoxydim (Poast)

See Hawaii Pesticide Information Retrieval System for Information on cole crops

0.5 to 1.5 pt. per acre. Post-plant/Postemergent.

Grass weed control.

30 day PHI.