Table 2. Estimates of percent yield loss in corn due to leaf defoliation at selectedd leaf stages |
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Leaf stage (/a) | Percent leaf defoliation |
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10,000 |
12,000 |
14,000 |
16,000 |
|
Approximate % yield loss |
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7-leaf |
0 |
2 |
5 |
9 |
8-leaf |
0 |
3 |
6 |
11 |
9-leaf |
1 |
4 |
7 |
13 |
10-leaf |
1 |
6 |
9 |
16 |
11-leaf |
1 |
7 |
12 |
22 |
12-leaf |
2 |
9 |
16 |
28 |
13-leaf |
2 |
10 |
19 |
34 |
14-leaf |
3 |
13 |
25 |
44 |
(/a) Leaf stage according to the "droopy leaf" method (see Nielsen, 2004a). The corresponding leaf stage according to the leaf collar method would be approximately 2 less than the "droopy leaf" values shown above (e.g., 7-leaf ~ V5) Adapted from the National Crop Insurance Association's "Corn Loss Instruction" (Rev. 1994). |
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