Vegetable Production Guide

Carrots
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Table 3 Carrot Disease Control

This section was updated - 12 September 2018
Table 3 Carrot Disease Control

Product

Rate

PHI*

Comments

Foliar Blights

Lance WDG


(boscalid)

Group 7
315 g/ha
(126 g/acre)

Apply in 100 L/ha (40 L/acre) of water
0
  • For control of Alternaria only.
  • Repeat at 7 to 14 day intervals.
  • Apply before disease develops.
  • Do not make more than 5 applications per season.
  • No more than 2 consecutive applications before alternating with a fungicide with a different mode of action.
  • Do not enter treated area for 12 hours.
  • For crops not on the label, observe a plant back interval of 14 days.

Cantus WDG


(boscalid)

Group 7

Sercadis


(fluxapyroxad)

Group 7
250 to 333 mL/ha
(101 to 135 mL/acre)

Apply in 100 L/ha (40 L/acre) of water
7
  • For control of Alternaria only.
  • Repeat at 7 to 14 day intervals.
  • Do not make more than 3 applications per season.
  • Do not apply more than 1.0 L/ha (405 mL/acre) per season
  • No more than 2 consecutive applications before alternating with a fungicide with a different mode of action.
  • Do not enter treated area for 12 hours.
  • For crops not listed, observe a plant back interval of 1 year.

Pristine WG


(boscalid & pyraclostrobin)

Group 7 & 11
580 to 735 g/ha
(235 to 297 g/acre)
0
  • Begin applications prior to disease development and continue on a 7 to 14 day schedule.
  • Do not apply more than 6 times per season.
  • Do not re-enter for hand-harvesting for 3 days after applying. For all other activities, do not re-enter until residues have dried.

Bravo 500


(chlorothalonil)
2.4 to 3.2 L/ha
(1.0 to 1.3 L/acre)
1
  • Repeat at 7 to 10 day intervals.
  • Do not apply Echo 90 DF more than 7 times per season.
  • Do not enter treated area for 48 hours.
  • Do not apply within 10 days before or after an oil application.
  • Group M fungicide

Echo 90 DF


(chlorothalonil)
1.3 to 1.8 kg/ha
(500 to 730 g/acre)

Echo 720


(chlorothalonil)
1.7 to 2.2 L/ha
(700 to 900 mL/acre)

Polyram DF


(metiram)
2.25 kg/ha
(900 g/acre)
7
  • Apply when plants are 6 weeks old or when disease threatens.
  • Repeat every 7 to 10 days.
  • Do not use treated tops for food or feed.
  • Group M fungicide

Dithane DG Rainshield NT


(mancozeb)

Dithane F-45


(mancozeb)
3.8 L/ha
(1.5 L/acre)

Penncozeb 75DF


(mancozeb)
2.25 kg/ha
(900 g/acre)
7
  • Apply when plants are 6 weeks old or when disease threatens.
  • Repeat at 7 to 10 day intervals.
  • Do not enter treated areas for 24 hours.
  • Do not use treated tops for food or feed.
  • Group M fungicides.

Penncozeb 75DF Raincoat

(mancozeb)

Cabrio EG


(pyraclostrobin)

Group 11
Alternaria:
0.56 to 1.1kg/ha
(220 to 440 g/acre)

Cercospora:
560 to 840 g/ha
220 to 340 g/acre)
3
  • Maximum of 3 applications per season.
  • Repeat at 7 to 14 day intervals.
  • No more than 2 consecutive applications before alternating with a fungicide with a different mode of action.
  • Do not enter treated area for hand-harvesting for 3 days and for all other activities, do not enter for 12 hours.
  • Do not use treated crop for feed.
  • Apply in at least 225 L/ha (90 L/acre) of water.

Manzate DF


(mancozeb)

Group M
2.25 kg/ha
(900 g/acre)
7
  • Repeat at 7 to 10 day intervals.
  • Do not use treated tops for feed or food.
  • Do not apply where runoff is likely to occur.
  • Apply in 200 to 1000 L/ha (80 to 405 L/acre) of water.

Switch 62.5 WG


(cyprodinil & fludioxonil)

Group 9 & 12
775 to 975 g/ha
(314 to 395 g /acre)

Apply in 200 L/ha (80L/acre) of water
7
  • Repeat at a 7 to 10 day interval.
  • Do not make more than 2 sequential applications of Switch or other fungicides in the same group (9 or 12) in a season.
  • Do not apply more than 2.9 kg of product/ha/year.
  • Observe a 30 day plantback interval for crops not listed.
  • Do not enter treated area for 12 hours.

Allegro 500 F


(fluazinam)

Group 29
1.16 L/ha
(469 mL/acre)

Apply in 200 to 600 L/ha (80 to 240 L/acre)
7
  • Controls white mould and Alternaria leaf blight.
  • Repeat using a 7 day application interval.
  • Maximum 4 applications per year.
  • See label details for plantback intervals.
  • Do not enter treated area for 24 hours.

Fontelis


(penthiopyrad)

Group 7
1.25 to 2.25 L/ha
(505 to 910 mL/acre)

Apply in 110 L/ha (45 L/acre) of water
0
  • Controls Alternaria blight
  • Repeat at 7 to 14 day intervals.
  • Do not apply more than 45 L/ha (1.8 L/acre) per season.
  • Do not make more than 2 sequential applications before switching to a fungicide with a different mode of action.
  • Do not re-enter for 12 hours.

Quadris Top

(azoxystrobin/ difenoconazole)

Group 11 & 3

566 to 1000 mL/ha
(229 to 405 mL/acre)

Apply in 150 L/ha (60 L/acre) of water.

7
  • Controls Alternaria blight.
  • Repeat at 7 to 14 day intervals.
  • Do not make more than 3 applications per year.
  • Do not re-enter treated areas for 12 hours.
  • Observe a plant back interval of 60 days for all crops not registered on this label or the Inspire label.

Flint

 

(trifloxystrobin)

Group 11

140 to 210 g/ha ( 57 to 85 g/acre)

Apply in 100 L/ha (40 L/acre) of water at 241.5 kPa 

7
  • Control or suppression of Alternaria Leaf blight.
  • Repeat at 14 day intervals.
  • Do not apply more than 840 g/ha (340 g/acre) of product per season.
  • Do not make more than 4 applications per season.
  • Observe a plantback interval of 30 days for crops not listed.

Rhizoctonia Crown Rot

Quadris


(azoxystrobin)

Group 11
4 to 6 mL of product per 100m of row

Apply in 50 to 100 L/ha (20 to 40 L/acre) of water
40
  • Apply either in-furrow at seeding or as a banded application over the row soon after emergence or within 30 days of emergence.
  • Do not make more than one application per year.
  • A plant back interval of 30 days is required for broadleaf and root crops.
  • A plant back interval of 45 days is required for cereals.
  • Do not enter treated area until residues have dried.

Cavity Spot (Pythium spp.)

Torrent 400 SC

 

(cyazofamid)
 
Group 21
440 mL/ha
(180 mL/acre)
30
  • Suppression only.
  • Also suppresses root dieback and forking.
  • Do not make more than one application per year.
  • Apply as either a post-plant, pre-emergent within 3 days of seeding or as a soil-directed spray 14 days after planting.

Post-plant, pre-emergent application:

  • Apply before plant emergence within 3 days of seeding.
  • Use sufficient water to ensure full coverage and follow with sprinkler irrigation of 1.25 to 2.5 cm of water.

Surface application (broadcast or band):

  • Apply as a soil directed spray, 14 days after seeding.
  • Use sufficient water to ensure penetration into the soil or irrigate with 1.25 to 2.5 cm of water.
  • For banded applications, use a 15.2 to 20.3 cm band.  See label to calculate amount of product required in the band.

 

Reason 500SC

(fenamidone)

 

Group 11

600 mL/ha
(240 mL/acre)

Apply in 300 to 750 L/ha (120 to 300 L/acre) of water 

14
  • Also controls damping off caused by Pythium spp.
  • Make the first application within 7 days after planting.
  • Repeat at 7 day intervals.
  • Do not make more than 2 applications per growing season.
  • Observe a plantback interval of 30 days.

Serenade Soil

(QST 713 strain of dried Bacillus subtilis)
 
smileyUsed in organics.

 

2.7 to 14 L/ha (1.1 to 5.7 L/acre) 0
  • Suppression only.
  • smileySerenade Soil (PCP# 30647) is OMRI-Canada listed.  Check with your certification body before using in an organic operation.  

Surface Application:

  • Apply as a 15 cm band over the top of the seed row as a broadcast spray after planting.
  • Ensure incorporation into the seed zone within 24 hours of application via rainfall or overhead irrigation.

Post-plant applications:

  • After crop germination, additional applications may be made to the soil as a drench or spray directed towards the base of the plant.
  • Irrigate to move material into the seed or root zone within 24 hours.
  • Repeat at 21 to 28 day intervals.

Post-Harvest White Mold/Sclerotinia Rot (Sclerotinia sclerotiorum)

Scholar 230SC

(fludioxonil)

Group 12

N.B.  For domestic use only.  Do not use on product intended for export.

Mix 498 mL of product in 378 L of water. N/A
  • Apply as a post-harvest dip or drench immediately before storage.
  • Dip for approximately 30 seconds and allow carrots to drain.
  • Maximum of one application.
  • Do not store treated carrots in direct sunlight.
  • Replenish the suspension when the volume is too low or when it becomes dirty.
  • Runoff and wastes from dipping operation should not be discarded in a drainage which could enter public water systems.
*PHI = Pre-harvest interval.
BUFFERS – Refer to product label for buffer requirements. See also Pesticide Regulations and Safety section of this guide.
PESTICIDE GROUP DETAILS – see Pesticide Toxicity Table of this guide.
smileyOMRI-Canada = Organic Materials Review Institute of Canada

 

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