Vegetable Production Guide

Onions, Dry Bulb
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Table 2 Dry Bulb Onion Insect Control

This section was updated - 22 January 2018

Table 2 Dry Bulb Onion Insect Control

 

Product

Rate

PHI*

Comments

Onion Maggot Foliar Sprays - Organophosphates

Dibrom

(naled)

Group 1B
550 mL/ha
(220 mL/acre)

Apply in 100 to 300 L/ha (40 to 120 L/acre) of water.
4
  • Applications during hot weather may result in crop injury.
  • Do not apply in temperatures over 32°C.
  • Also controls thrips.
  • Do not apply more than twice per season.
  • Do not enter treated area for 48 hours.

Onion Maggot & Thrips Foliar Sprays – Synthetic Pyrethroids

Mako (Ripcord)

(cypermethrin)
175 mL/ha
(70 mL/acre)
3
  • Maximum of 3 applications per season.
  • Apply at a 7 to 10 day spray interval.
  • Apply in a minimum of 110 L/ha (44 L/acre) of water.
  • Very toxic to bees. Avoid spraying when bees are foraging.
  • Group 3 insecticide.

Up-Cyde 2.5 EC

(cypermethrin)
280 mL//ha
(115 mL/acre)

Thrips

Decis 5 EC

(deltamethrin)

Group 3
200 mL/ha
(80 mL/acre)

Apply in 200 to 500 L/ha (80 to 200 L/acre) water
5
  • Apply mid-season at the proper thrips threshold. (Use the advice of a crop monitoring service).
  • Do not apply more than once per season.
  • For soils with high organic matter content (muck soils), apply prior to August 1.

Malathion 85E

(malathion)

Group 1B
1.1 L/ha
(0.44 L/acre)
 
Apply in 1000 L/ha (405 L/acre) of water 
3
  • Do not apply more than one time per year.
  • Best control is obtained when temperature is above 20° C.
  • Toxic to fish.
  • Do not apply where runoff is likely to occur.
  • Do not apply after expiry date on the container label.
  • Do not re-enter treated area for 12 hours.

Matador 120EC

(lambda- cyhalothrin)
188 mL (76 mL)

Apply in 500 L/ha (200 L/acre) of water
14
  • Allow a 7 day interval between applications.
  • Do not apply more than 3 times per season.
  • Do not enter treated areas for 24 hours.
  • Group 3 insecticide.

Silencer 120EC

(lambda-cyhalothrin)

Delegate WG

(spinetoram)

Group 5

200 to 336 g/ha
(81 to 136 g/acre)

Apply in 300 to 500 L/ha (120 to 200 L/acre) of water

3
  • Suppression only.
  • For optimal performance, final solution pH should be in the range of 6 to 8.
  • Apply at egg hatch or to small larvae.
  • Ensure spray solution penetrates to leaf axils.
  • Repeat at 7 to 10 day intervals.
  • Maximum of 3 applications per year.
  • Toxic to bees. Avoid spraying when bees are foraging.
  • Do not re-enter treated area for 12 hours.

Entrust 80W

(spinosad)
 
smileyUsed in organics

131 to 158 mL/ha
(53 to 64 mL/acre)

3
  • Suppression only.
  • Apply in 300 to 500 L/ha (120 to 200 L/acre) of water.
  • Apply when onion thrips first appear targeting egg hatch or small nymphs.
  • Repeat at 7 to 10 day intervals.
  • Do not apply more than three times per season.
  • Highly toxic to bees exposed to direct treatment , drift or residues from blooming plants.
  • Harmful to parasitoids and predatory mites and slightly harmful to foliage-dwelling predators.
  • Do not re-enter treated area until residues have dried.
  • smileyEntrust products are OMRI-USA listed.  Check with your certification body before using in an organic operation.
  • Group 5 insecticides.

Entrust SC

(spinosad)

smileyUsed in organics

437 to 527 mL/ha (177 to 213 mL/acre)

Success 480SC

(spinosad)

218 to 262 mL/ha
(88 to 106 mL/acre)

Movento 240 SC

(spirotetramat)

Group 23

365 mL/ha
(150 mL/acre)

Apply in 200 L/ha (80 L/acre) of water
3
  • Controls Onion Thrips (larvae).
  • Repeat at 7 day intervals.
  • Do not apply more than twice per season.
  • Maximum allowed per crop season: 730 mL/ha (295 mL/acre).
  • Movento 240 SC should be used with one of the following adjuvants: non-ionic (eg. Agral 90 or Ag-Surf) or methylated seed oil (eg. Hasten).
  • Reduction in numbers of thrips larvae may take 3 to 4 days after application.
  • Do not enter treated area for 12 hours.
  • Toxic to bees.  Do not apply during crop flowering period or when flowering weeds are present.

Agri-Mek 1.9% EC

(abamectin)

600 to 1200 mL/ha
(243 to 485 mL/acre)

30
  • Apply in 200 L/ha (80L/acre) of water.
  • Apply when onion thrips first appear.
  • Use a non-ionic surfactant at the rate of 0.25 to 0.5% v/v of spray mixture.
  • Repeat at 7 day intervals.
  • Do not apply more than three times per season.
  • Highly toxic to bees exposed to direct treatment, drift or residues from blooming plants.
  • Check label for re-entry.
  • Group 6 insecticides.

Agri-Mek SC

(abamectin)

135 to 270 mL/ha
(55 to 109 mL/acre)

Exirel

(cyantraniliprole)
 
Group 28

1000 to 1500 mL/ha
(405 to 605 mL/acre)

Apply in 200 L/ha (80 L/acre) of water

1
  • Suppression only.
  • Do not make more than 4 applications per growing season.
  • Repeat at 5 day intervals.
  • Do not apply more than 4.5 L/ha (1.8 L/acre) per season.
  • Use with an adjuvant such as Hasten NT at a rate of 0.25% v/v or MSO Concentrate with Leci-Tech at a rate of 0.5% v/v.
  • Toxic to bees and certain beneficial insects.  Apply early in the morning or late in the evening when bees are not active.
  • Note:  Do not tank-mix or apply in sequence with strobilurin-, copper- or captan-containing fungicides.
  •  Observe a plantback interval of 30 days for legume vegetables, cereals, grass, crop group 1A (inlcuding beets, carrots, radish, parsnip, turnip) and crop group 2 (inlcuding beet greens and turnip greens). 
  • Observe a plantback interval of 1 year for crops not on this label.
  • Do not enter treated area for 12 hours.

*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-USA = Organic Materials Review Institute of USA

 

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