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Mind your pre-harvest intervals

By Danielle Stephens, PAg, MSc, Integrated Pest Management Agrologist

Insect pests and plant disease don’t often respect our schedules. There can still be risks as crops begin to mature, especially considering the wet conditions in many areas of the province. It is important to scout for disease and insects and weigh the risk to the crop based on economic thresholds. It is also important to know when the window to act has passed and it is no longer possible or economical to spray.

Insect pests such as grasshoppers may feed on developing lentil (blooming or podding) or flax seeds (green boll stage). Aphids are also a potential issue before the plants are at the soft dough stage. Spraying past these stages may not be economical.

For diseases in cereals (fusarium head blight) and canola (sclerotinia), the spray window is during crop flowering. Once the window for fungicide application has passed, there are no registered fungicides available for disease management. However, for indeterminate crops such as lentil or pea, there may still be the potential to control disease if conditions favour further development, it is economical to control it and there is a fungicide with the appropriate pre-harvest interval (PHI).

A PHI is the number of days that must past between the application on the chemical and the swathing, desiccation or otherwise cutting/termination of the crop’s growth. As we get closer to harvest it is critical to consider the PHI for all chemical applications. All pesticides, herbicides, fungicides and insecticides will have a PHI (Table 1, Table 2) that is set so that harvested crops do not exceed the maximum residue limit (MRL) of that chemical. If the crop is harvested prior to the indicated PHI, there could be unsafe or unacceptable residues of the pesticide in or on harvested seeds.

Tables of foliar fungicides and foliar insecticides are listed below. The PHI information can also be found on each product page of the Guide to Crop Protection and on the pesticide label itself.

Table 1: Foliar insecticide pre-harvest intervals

Insecticide
Group

Active
Ingredient

Product Name

Preharvest Interval
(days)

1A

carbaryl

Sevin, Eco Bran

Wheat, Oats, Rye - 14; Barley - 28; Beans - 5; Peas -3 (Sevin only); Canola - treat only seedlings

1A

methomyl

Lannate

Wheat, Barley, Oats - 20; Canola, Flax - 8; Peas - 1

1B

malathion

Malathion

Wheat, Barley, Oats, Rye, Canola, Mustard, Flax - 7; Bean - 1-3 (see labels); Pea - 3; Lentil - 14 or 30 (see labels); Canaryseed - 14

1B

naled

Dibrom

Bean - 4

1B

chlorpyrifos

Lorsban, Pyrinex, Nufos, Citadel

Wheat, Barley, Oats - 60; Canola, Flax - 21; Lentil - 21-60; Sunflower 42

1B

dimethoate

Lagon, Cygon 480 EC, Cygon 480-AG

Canola, Flax, Safflower, Canaryseed - 21; Peas - 3-21 (see labels); Rye 2-28 (see labels); Soybean - 30; Beans - 7; Wheat, Barley, Oats - Dependent (see labels)

3A

deltamethrin

Decis

Wheat, Barley, Flax - 40; Canola, Mustard - 7; Oat - 31; Lentil 30; Sunflower - 70

3A

cypermethrin

Mako Insecticide, UP-Cyde

Wheat, Barley - 21 (cutworms), Wheat - 30, Barley - 45 (grasshoppers), Canola, Mustard - 30, Sunflower - 70

3A

lambda-cyhalothrin

Matador, Silencer

Wheat, Barley, Oats -28 harvest (14 livestock foraging); Canola, Mustard, Flax - 7; Bean, Chickpea, Lentil, Pea, Faba bean - 14 (Matador) 21 (Silencer); Soybean - 21; Sunflower - 7

3A

permethrin

Ambush, Perm-UP, Pounce

Wheat, Barley, Oats, Rye, Canola, Flax,  Lentil, Pea, Sunflower - Prior to the 6 leaf stage

3A, 4A

imidacloprid + deltamethrin

Concept

Soybean - 20

5

spinetoram

Delegate

Wheat, Barley, Oats, Rye - 21

23

spirotetramat

Movento 240 SC

Beans, Chickpea, Lentil, Peas - 7, Soybean - 21

3A, 28

lambda-cyhalothrin + chlorantraniliprole

Voliam Xpress

Bean, chickpea, lentil, pea, - 14; Soybean - 21; Canola, mustard, sunflower - 7

28

chlorantraniliprole

Coragen

Canola, Mustard, Flax, Sunflower, Safflower, Bean, Chickpea, Lentil, Peas, Faba bean - 1

* Always check product labels for pre-harvest interval information

** Product registration on a crop does not mean it is registered to control all pests; check label information

*** Table does not include potatoes, corn, forage or rangeland pasture information

 

Table 2: Foliar fungicide preharvest intervals

Fungicide
Group

Active
Ingredient

Product Name

Preharvest Interval
(days)


1

thiophanate-methyl

Senator 70WP

White beans - No restrictions


2

iprodione

Rovral Flo, Rovral RX, Overall 240SC

Canola - 38


3

flutriafol

Fullback 125 SC

Soybean - 21


3

metconazole

Caramba

Wheat, triticale, barley, oat, rye - 30; Corn - 20


3

metconazole

Quash

Canola - 45; Bean, pea, chickpea, lentil, sunflower - 21


3

propiconazole

Tilt 250E, Bumper 418 EC, Pivot 418 EC, Propel, Propiconazole Fungicide

Wheat, oat, barley - 45; Canola - 60; Corn - 14; Soybean - 50, Bean - 28; Canaryseed (minor use)


3

prothioconazole

Proline 480SC

Barley, wheat, oat, rye, triticale - 30; Canola, mustard, flax - 36; Chickpea, lentil - 7; Corn - 14; Soybean - 20; Sunflower, safflower - 45


3

prothioconazole + tebuconazole

Prosaro 250EC

Wheat, barley - 36


3

tebuconazole

Folicur 250EW, Folicur 432F, Palliser, Fuse

Wheat, barley, oat - 36; Soybean - 20 (Folicur 432F or Folicur 250EW only)



3 + 7

prothioconazole + fluopyram

Propulse

Bean, faba bean - 14


3 + 11

azoxystrobin + propiconazole

Topnotch

Wheat, rye, barley, oats, triticale - 45


3 + 11

azoxystrobin + propiconazole

Quilt

Canola, soybean, bean, faba bean, chickpea, pea, lentil - 30; 


Wheat, barley, oat, rye, triticale - 45;


Corn - 14


3 + 11

azoxystrobin + difenoconazole

Exempla

Canola, mustard, flax - 30


3 + 11

prothioconazole + trifloxystrobin

Delaro

Pea, chickpea, lentil - 30; Soybean - 20


3 + 11

pyraclostrobin + metconazole

Twinline

Wheat, barley, oat, rye - Apply no later than the end of flowering


7

boscalid

Lance WDG Fungicide

Canola, mustard, bean, fababean, chickpea, lentil, sunflower, pea - 21


7

penthiopyrad

Vertisan

Canola, chickpea, lentil, bean, faba bean, pea - 21; Soybean, sunflower - 14; Corn - 7; Cereals - no restriction


7 + 11

boscalid + pyraclostrobin

Lance AG

Chickpea, lentil, pea, bean, faba bean, soybean - 30; Canola - 21


7 + 11

fluxapyroxad + pyraclostrobin

Priaxor

Chickpea, pea, lentil, bean, faba bean - 30; Soybean, canola, sunflower, flax, corn - 21 days; Barley, wheat, rye, oat - apply no later than the end of flowering


7 + 11

benzovindiflupyr + azoystrobin

Elatus

Chickpea, bean, pea, lentil - 15; Soybean - 14


9 + 12

cyprodinil + fludioxonil

Astound

Canola - 35


11

azoxystrobin

Quadris

 Bean, faba bean, chickpea, lentil, pea, soybean - 15; Canola - 30; Corn - 7; Coriander, Caraway - 21



11

picoxystrobin

Acapela

Wheat, barley, oat, rye, triticale - 45; Chickpea, pea, lentil, bean, faba bean, soybean-14; Canola - 28; Corn - 7


11

pyraclostrobin

Headline EC

Barley, rye, wheat, oat - apply no later than the end of flowering; Chickpea, lentil, pea, bean, faba bean, soybean - 30; Canola, mustard, canola quality Brassica juncea, flax, sunflower - 21; Corn - 7


29

fluazinam

Allegro 500F

Soybean and dry shelled beans - 30


M3

mancozeb

Dithane Rainshield, Kingpin 75 WDG, Manzate Pro-Stick, Penncozeb 75 DF

Wheat - 40, Lentil - 35


M5

chlorothalonil

Bravo 500, Bravo Zn, Echo 720, Echo 90DF

Lentil - 48; Wheat - 30; Pea - 32


Chickpea - Bravo 500: 14, Echo 720: 48


* Always check product labels for pre-harvest interval information


** Product registration on a crop does not mean it is registered to control all pests; check label information


*** Table does not include potatoes or forage crop information


 

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