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East-Central and Southeast Iowa Crop Information

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EVALUATING HAIL DAMAGE ON CORN

 

The growing point on corn is below ground until V6, when 6 leaves are fully emerged from the corn whorl , or about 8 leaves are visible. Prior to this time corn will generally regrow from hail damage. If the growing point is above ground, the growing point may still be alive. Make a horizontal cut through the corn and look for healthy white plant tissue in the center. Sometimes even though the growing point was not cut off, diseases set in after the hail and cause it to rot. Generally, some regrowth from the growing point can be seen 3-4 days after the hail. If no regrowth is seen, cut the plant and see if the growing point is rotting. Take stand counts as in soybeans and determine whether replanting is desirable based on the information below and the cost of replanting. Remember, the numbers in Table 1 assume a uniform stand.

Table 1. INFLUENCE OF PLANTING DATE AND POPULATION ON CORN YIELDS

Planting Date

Final Stand

4/20-5/5

5/5-5/15

5/16-5/25

5/26-6/5

6/5-6/15

35,000

100

96

87

70

54

30,000

99

95

86

69

53

25,000

95

91

83

67

51

20,000

89

85

77

63

48

15,000

81

78

71

57

44

10,000

71

68

62

50

38

Source: Iowa State University

 

 

Replanting to soybeans may be a better option after June 10-15, if the herbicides used will allow it. Corn herbicides that allow for replanting soybeans include: Dual II Magnum, Frontier, Define, Axiom, Python, Prowl, Pursuit, Basagran, Ignite, Accent (15 days), Basis(15 days), Option(15 days), Steadfast(15 days), and Aim (30 days).

Do not replant soybeans if Atrazine has been applied or if fewer than 30 days have elapsed per pint of Banvel (or Clarity) since application.

Prepared by Jim Fawcett and Virgil Schmitt, ISU Extension Field Specialists - Crops, 6/2001, Revised June 2008.

 

If you have any questions, please feel free to contact the Iowa State University Extension Office.


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Last Update: June 29, 2009
Contact: Virgil Schmitt vschmitt@iastate.edu


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