Estimated percent corn yield loss due
to defoliation at various Stages of Growth.*

Percent Leaf Area Destroyed Stage of Growth 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Tassel 3 5 7 9 13 17 21 26 31 36 42 48 55 62 68 75 83 91 100 Silk 3 5 7 9 12 16 20 24 29 34 39 45 51 58 65 72 80 88 97 Silks Brown 2 4 6 8 11 14 18 22 27 31 36 41 47 54 60 66 74 81 90 Pre-Blister 2 3 5 7 10 13 16 20 24 28 32 37 43 49 54 60 66 73 81 Blister 2 3 5 7 10 13 16 19 22 26 30 34 39 45 50 55 60 66 73 Early Milk 2 3 4 6 8 11 14 17 20 24 28 32 36 41 45 50 55 60 66 Milk 1 2 3 5 7 9 12 15 18 21 24 28 32 37 41 45 49 54 59 Late Milk 1 2 3 4 6 8 10 12 15 18 21 24 28 32 35 38 42 46 50 Soft Dough 1 1 2 2 4 6 8 10 12 14 17 20 23 26 29 32 35 38 41 Early Dent 0 0 1 1 2 3 5 7 9 11 13 15 18 21 23 25 27 29 32 Dent 0 0 0 1 2 3 4 6 7 8 10 12 14 15 17 19 20 21 23 Late Dent 0 0 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Nearly Mature 0 0 0 0 0 0 0 0 1 2 3 4 5 5 6 6 7 7 8 Mature 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 *Reprinted by permission from the National Crop Insurance Association's Corn Loss Instructions (Revised in 1994)

Copyright 2000 by the University of Nebraska

Published by University of Nebraska Cooperative Extension in the Institute of Agriculture and Natural Resources Cooperating with the counties and the U.S. Department of Agriculture

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