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 Watch out for

Bertha Armyworm – Economic Threshold

Mature Bertha armyworm larvae

20 larvae /m2 in canola can reduce yields by 1.16 bushels/acre.

Spraying
Cost - $/ac

Expected seed value - $/bushel

6

7

8

9

10

11

12

# larvae/ metre2

7

20

17

15

13

12

11

10

8

23

20

17

15

14

13

11

9

26

22

19

17

16

14

13

10

29

25

22

19

17

16

14

11

32

27

24

21

19

17

16

12

34

30

26

23

21

19

17

Sask Ag and Foods Bertha Armyworm Moth Count Map

Sask Ag and Food Website on Bertha Armyworms

Diamond Back Moth – Economic Threshold

Diamondback moth larva.                                 Diamondback moth pupa

 

Stage

Threshold

Early growth stages (cotyledon and rosette)

25 to 33 % of leaf tissue destroyed and the larvae are still feeding on the plants.

Immature and flowering fields

100 to 150 larvae /m2

Late flowering and podded canola

200 to 300 larvae /m2

Sask Ag and Food Website on Diamond Back Moth

Wheat Midge – Economic Threshold

Side view of the wheat midge resting on wheat spikelets.

Egg laying by midge females generally takes place after 8:30 p.m. when wind speeds are less than 10 km/h and the air temperature is greater than 15°C. Therefore this is the best time to monitor and take control measures.

Threshold

Action

Yield (15% Damage)

1 adult midge / 4-5 wheat heads

Grade (Down grading No.1 Wheat)

1 adult midge / 8-10 wheat heads

Sask Ag and Food Website on Midge

 

 

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