Fill in the blanks:
| 1. _____ egg masses per plant* |
x 4.5 borers per egg mass |
= |
borers per plant |
| 2. _____ borers per plant |
x _____ percent yield loss per borer** |
= |
percent yield loss |
| 3. _____ percent yield loss |
x _____ expected yield (bu. per acre) |
= |
bushels per acre loss |
| 4. _____ bushels loss per acre |
x _____ price per bushel |
= $ |
loss per acre |
| 5. _____ loss per acre |
x 80 percent control |
= $ |
preventable loss per acre |
| 6. _____ preventable loss per acre |
- _____ cost of control per acre |
= $ |
profit (loss) per acre |
* Cumulative counts taken five to seven days later can be added here.
** Use 0.04 for pollen-shedding corn, 0.03 if kernels are initiated.
Example
| 1. 0.3 egg masses per plant* |
x 4.5 borers per egg mass |
= 1.35 borers per plant |
| 2. 1.35 borers per plant |
x 0.04 percent yield loss per borer** |
= 0.05 percent yield loss |
| 3. 0.05 percent yield loss |
x 150 expected yield (bu. per acre) |
= 7.5 bushels per acre loss |
| 4. 7.5 bushels loss per acre |
x $3.50 price per bushel |
= $ 26.25 loss per acre |
| 5. $26.25 loss per acre |
x 80 percent control |
= $21.00 preventable loss per acre |
| 6. $21.00 preventable loss per acre |
- $15.00 cost of control per acre |
= $6.00 profit (loss) per acre |
* Cumulative counts taken five to seven days later can be added here.
** Use 0.04 for pollen-shedding corn, 0.03 if kernels are initiated.
This article originally appeared on page 147 of the IC-476(21) -- August 5, 1996 issue.
