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East-Central and Southeast Iowa Crop Information

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Expected Percentage Yield Loss Due to Defoliation

 

Growth stages V1-N are the vegetative (pre-bloom) stages. Growth stage R1 is beginning flowering. Stage R2 is full bloom.

 

Defoliation Percent

 

Total defoliation in the vegetative stages does not cause yield loss.

Stages

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

R1-2

0

1

2

2

3

4

5

5

6

7

7

8

9

10

12

14

16

19

23

 

 

Cut Off / Break Over Chart

 

Percent of Nodes Cut Off

Stage

5

10

15

20

25

30

35

40

45

50

55

60

65

V1-N

0

1

2

3

3

4

5

6

7

9

11

14

18

R1-2

1

3

4

6

7

8

9

11

12

13

16

19

23

 

If you have any questions, please feel free to contact the Iowa State University Extension Office.
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Last Update: July 8, 2003
Contact: Virgil Schmitt vschmitt@iastate.edu


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