Table 17. Alfalfa Weevil Economic Threshold Chart for Alfalfa

 

  Cost of an Insecticide Application Per Acre
Crop Value $8.00 $10.00 $12.00 $14.00 $16.00 $20.00
             
$60 91 114 137 160 183 225
$80 68 85 102 119 136 171
$100 54 68 81 95 108 137
$120 45 57 68 79 91 114
$140 39 49 59 68 77 99
$160 34 43 51 60 68 86
             
  Height Category II - 19 to 24 inches
$60 99 124 149 174 199 240
$80 75 94 113 131 150 186
$100 62 75 90 105 120 149
$120 50 62 75 87 100 124
$140 43 54 64 75 86 107
$160 37 47 56 65 75 94
             
  Height Category III - 25 to 30 inches
$60 104 124 156 182 209 260
$80 78 97 117 137 157 195
$100 63 78 94 110 126 156
$120 52 65 78 91 105 130
$140 45 56 67 78 90 112
$160 39 49 58 68 79 98
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