Table 2.
Estimated amounts of B. thuringiensis subsp. kurstaki applied in Seattle spray areas and remaining at the time of sample collection
| Yr | Spray area | Size (km2) |
B. thuringiensis subsp. kurstakia |
||
|---|---|---|---|---|---|
| Estimated amt (g) applied | Estimated amt (g) remaining | Estimated no. of spores remaining | |||
| 2007 | Kent | 0.1 | 71 | 6–20 | 1011–1012 |
| 2006 | Madison | 0.24 | 10,000 | 60–800 | 1012–1013 |
| 2006 | Rosemont | 0.022 | 16 | <1–1 | 1010–1011 |
| 2005 | Eastlake | 0.049 | 2,000 | 1–50 | 1011–1012 |
| 2004 | Bellevue | 0.044 | 2,000 | <1–20 | 109–1012 |
a
The amount applied assumes multiple applications at rates of 740 liters km−2 for Kent, Madison, and Rosement, 620 liters km−2 for Eastlake, and 200 and 250 liters km−2 for Bellevue. For the amount remaining and the number of spores remaining, the lower number assumes a 100-day half-life and the higher number assumes a 200-day half-life. The number of spores remaining assumes 1011 spores/g.