Remarks: Use short-residual insecticides. Early cutting may be advisable. Stubble sprays may be necessary.
| Cost of insecticide application per acre -> | $8 | $10 | $12 | $14 | $16 |
|---|---|---|---|---|---|
| Value of hay per ton: | (Number of larva per 30-stem sample) | ||||
| $80 | 78 | 97 | 117 | 137 | 157 |
| $100 | 63 | 78 | 94 | 110 | 126 |
| $120 | 52 | 65 | 78 | 91 | 105 |
| $140 | 45 | 56 | 67 | 78 | 90 |
| $160 | 39 | 49 | 58 | 68 | 79 |