Table 2.
Population densities of Aspergillus section Flavi in soil from fields in the southeastern United States treated with Afla-Guard and AF36 biocontrol strains.
| Colony forming units (CFU) at sampling perioda | ΔCFUb | |||||
|---|---|---|---|---|---|---|
| Year | State | Pre-application | Post-application | Harvest | Post-application | Harvest |
| 2012 | Alabama | 33 (3–189) | 151 (7–679) | 516 (33–3,019) | 4.6 | 15.6 |
| Georgia | 413 (4–1,906) | 220 (9–888) | –c | −0.5 | –c | |
| North Carolina | 38 (11–113) | 237 (6–1786) | 986 (21–1,005) | 6.2 | 25.9 | |
| 2013 | Alabama | 106 (16–212) | 111 (42–227) | 376 (48–1,406) | 1.1 | 3.5 |
| Georgia | 20 (1–103) | –c | 173 (16–432) | –c | 8.6 | |
| North Carolina | 157 (6–509) | 240 (3–1,009) | 250 (3–926) | 1.5 | 1.6 | |
Soil densities (i.e., CFU) are means per gram of soil based on 20 samples collected from each field in a state. Numbers in parenthesis represent the range (minimum to maximum) of CFU. AF36 and Afla-Guard were evaluated in both years in North Carolina. In Alabama, Afla-Guard was evaluated in both years, while AF36 was evaluated only in 2013. In Georgia, only Afla-Guard was evaluated in both years.
ΔCFU refers to change (– or +) in CFU relative to CFU prior to application of biocontrol strains. ΔCFU = (x/y), where x = CFU at post-application or harvest, and y = CFU at pre-application of biocontrol strains.
Soil samples were not collected at this time period and no data is available.