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Biology and Biological Conrol of Yellow Starthistle


44 Images
1350002
John Connett
University of Idaho

flowering near Peck, Idaho

1350003
Cindy Roche

1350004
Cindy Roche

1350005
Cindy Roche

1350006
Cindy Roche

Seedling stage

1350007
Cindy Roche

Rosette stage

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Cindy Roche

Bolting stage

1350009
Cindy Roche

Small buds with yellow-green spines begin to be visible at the top.

1350010
Cindy Roche

Spines protrude more than half of the bud length.

1350011
Cindy Roche

Spines are equal to or greater than 45° angle from stem

1350012
Cindy Roche

Spines are straw-colored and equal to or greater than 90° angle from stem.

1350013
Cindy Roche

Flowering stage

1350014
Cindy Roche

Seed formation stage

1350015
Cindy Roche

Mature stage

1350016
Cindy Roche

Seed dissemination stage

1350017
Cindy Roche

Senescence stage

1350018
University of Idaho Archive
University of Idaho

1350019
University of Idaho Archive
University of Idaho

1350020
Eric Coombs
Oregon Department of Agriculture

Urophora sirunaseva gall

1350021
John Connett
University of Idaho

1350022
John Connett
University of Idaho

feeding on BU-1 bud

1350023
John Connett
University of Idaho

oviposition hole

1350024
John Connett
University of Idaho

1350025
J. Johnson
University of Idaho

1350026
J. Johnson
University of Idaho

1350027
John Connett
University of Idaho

exit hole

1350028
John Connett
University of Idaho

dead and bent yellow starthistle head from weevil feeding

1350029
Linda Wilson
University of Idaho

1350030
Leonard L. Lake
USDA Forest Service

face down in starthistle flower head

1350031
D. Schotzko
University of Idaho

1350032
Gary L. Piper
Washington State University

1350034
D. Schotzko
University of Idaho

1350035
Eric Coombs
Oregon Department of Agriculture

woody gall

1350036
Eric Coombs
Oregon Department of Agriculture

emergence hole

1350037
Linda Wilson
University of Idaho

1350038
University of Idaho Archive
University of Idaho

example of yellow starthistle infestation suitable for a biological control program

1350070
Karen Loeffelman
University of Idaho

for insects

1350039
University of Idaho Archive
University of Idaho

collecting yellow starthistle biocontrol agents

1350071
University of Idaho Archive
University of Idaho

1350072
University of Idaho Archive
University of Idaho

styrofoam-lined shipping box containing blue ice pack and biocontrol agent cartons

1350041
Nez Perce BioControl Center Archive
Nez Perce BioControl Center

screen tent cage in which to release and contain knapweed bioagents

1350042
John Connett
University of Idaho

monitoring for biocontrol agents

1350076
University of Idaho Archive
University of Idaho

measuring knapweed height at a quantitative monitoring site

1350043
Linda Wilson
University of Idaho

monitoring a infestation