water hyacinth biological control
| 30 Images |
 Ted D. Center USDA Agricultural Research Service |
at Mara River |
 Willey Durden USDA Agricultural Research Service |
Alligator Alley |
 U.S. Geological Survey Archive U.S. Geological Survey |
Drainages infested |
 USDA Agricultural Research Service Archive USDA Agricultural Research Service |
Morphology of waterhyacinth plants: A. The "attenuated-petiole" rosette form produced in crowded conditions; B. An expanding axillary bud; C. A developing ramet; and D. The "bulbous-petiole" rosette form produced in open conditions. Abbreviations: ar - adventitious root; bb - bud bract; in - inflorescence; is - leaf isthmus; la - leaf blade; pl - primary leaf; pd - peduncle of flower spike; pt - leaf petiole; rh - rhizome; sp - spathe; st - stolon. |
 Willey Durden USDA Agricultural Research Service |
Neochetina eichhorniae (left) and N. bruchi (right) |
 Willey Durden USDA Agricultural Research Service |
Late-stage larva feed at the base of leaf petioles often damaging a subtending axillary buds |
 Willey Durden USDA Agricultural Research Service |
plants stressed by weevils tend to be of small stature and lose buoyancy |
 Martin P. Hill ARC - Plant Protection Research Institute |
|
 Carina J. Cilliers ARC - Plant Protection Research Institute |
A mat in South Africa in decline due to infestation; at Clairwood Quarry |
 Willey Durden USDA Agricultural Research Service |
late instar |
 Willey Durden USDA Agricultural Research Service |
male |
 Willey Durden USDA Agricultural Research Service |
with larval mines and exit hole |
 John Stanley Commonwealth Scientific and Industrial Research Organization |
|
 Martin P. Hill ARC - Plant Protection Research Institute |
|
 Christine A. Bennett USDA Agricultural Research Service |
quarantine on leaf |
 Hugo A. Cordo USDA ARS - South American Biological Control Laboratory |
to leaf petiole caused by larvae |
 I.G. (Hardi) Oberholzer ARC - Plant Protection Research Institute |
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 I.G. (Hardi) Oberholzer ARC - Plant Protection Research Institute |
|
 I.G. (Hardi) Oberholzer ARC - Plant Protection Research Institute |
feeds on leaves producing a characteristic "tattered" appearance |
 Willey Durden USDA Agricultural Research Service |
|
 Stefan Neser ARC - Plant Protection Research Institute |
late instar |
 Stefan Neser ARC - Plant Protection Research Institute |
|
 Hugo A. Cordo USDA ARS - South American Biological Control Laboratory |
extensive damage, Spring 1999 |
 Christine A. Bennett USDA Agricultural Research Service |
|
 Hugo A. Cordo USDA ARS - South American Biological Control Laboratory |
|
 USDA Agricultural Research Service Archive USDA Agricultural Research Service |
data from Louisana showing reduced waterhyacinth acreage and limited annual growth after introduction of Neochetina eichhorniae in 1974, N. bruchi in 1975, and Niphograpta albiguttalis in 1979 |
 Mic Julien Commonwealth Scientific and Industrial Research Organization |
Lake Victoria at Kisumu Yacht Club |
 Mic Julien Commonwealth Scientific and Industrial Research Organization |
was released, (before release) at Lake Victoria at Kisumu Yacht Club |
 Ken L S Harley Commonwealth Scientific and Industrial Research Organization |
was released, (before release) at Lake Victoria at Port Bell |
 Mic Julien Commonwealth Scientific and Industrial Research Organization |
was released,(after release) at Lake Victoria at Port Bell |
