| 5435695 |
diffuse knapweed |
Centaurea diffusa |
biocontrol site, little diffuse knapweed left, not grazed for 10 years, field next to it on right is nearly solid DKW. |
| 1355036 |
yellow starthistle |
Centaurea solstitialis |
Morning dew on a yellow starthistle leaf. Evening inoculations with rust spores (from Puccinia jaceae var. solstitialis) are made to catch the overnight dew needed for spore germination and infection. |
| 1355033 |
yellow starthistle |
Centaurea solstitialis |
Three weeks after yellow starthistle was inoculated with rust spores, ARS plant pathologist Bill Bruckart (left) and California Department of Food and Agriculture plant pathologist Dale Woods inspect one of 20 test sites to learn about the pathogen's performance. |
| 1355034 |
yellow starthistle |
Centaurea solstitialis |
California Department of Food and Agriculture lab assistant Viola Popescu uses a cyclone spore collector developed at the Fort Detrick lab to harvest inoculum from plants at the CDFA greenhouse in Sacramento. |
| 1355035 |
yellow starthistle |
Centaurea solstitialis |
Small, rust-colored spots on starthistle leaves. The presence of these spots indicates that the first field releases of rust spores on starthistle are a success. |
| 1350039 |
yellow starthistle |
Centaurea solstitialis |
collecting yellow starthistle biocontrol agents |
| 1350072 |
knapweeds |
Centaurea spp. |
styrofoam-lined shipping box containing blue ice pack and biocontrol agent cartons |
| 1350041 |
knapweeds |
Centaurea spp. |
screen tent cage in which to release and contain knapweed bioagents |
| 1350073 |
spotted knapweed |
Centaurea stoebe ssp. micranthos |
releasing bioagents |
