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East-Central and Southeast Iowa Crop Information

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Estimated Percent Corn Yield Loss Due to Defoliation at Various Stages of Growth

Percent of Leaf Area Destroyed

Stage

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

V7

0

0

0

0

0

0

1

1

2

3

4

4

5

5

6

7

8

9

9

V8

0

0

0

0

0

1

1

2

3

4

5

5

6

6

7

8

9

10

11

V9

0

0

0

1

1

2

2

3

4

5

6

6

7

7

9

10

11

12

13

V10

0

0

0

1

2

3

4

5

6

7

8

8

9

9

11

13

14

15

16

V11

0

0

1

1

2

3

5

6

7

8

9

10

11

12

14

16

18

20

22

V12

0

0

1

2

3

4

5

7

9

10

11

13

15

16

18

20

23

26

28

V13

0

1

1

2

3

4

6

8

10

11

13

15

17

19

22

25

28

31

34

V14

0

1

2

3

4

6

8

10

13

15

17

20

22

25

28

32

36

40

44

V15

1

1

2

3

5

7

9

12

15

17

20

23

26

30

34

38

42

46

51

V16

1

2

3

4

6

8

11

14

18

20

23

27

31

36

40

44

49

55

61

V17

2

3

4

5

7

9

13

17

21

24

28

32

37

43

48

53

59

65

72

V18

2

3

5

7

9

11

15

19

24

28

33

38

44

50

56

62

69

76

84

V19-21

3

4

6

8

11

14

18

22

27

32

38

43

51

57

64

71

79

87

96

Tassel

3

5

7

9

13

17

21

26

31

36

42

48

55

62

68

75

83

91

100

Silked

3

5

7

9

12

16

20

24

29

34

39

45

51

58

65

72

80

88

97

 

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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