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water hyacinth biological control


30 Images
0002074
Ted D. Center
USDA Agricultural Research Service

at Mara River

0002100
Willey Durden
USDA Agricultural Research Service

Alligator Alley

0002101
U.S. Geological Survey Archive
U.S. Geological Survey

Drainages infested

0002102
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.

0002075
Willey Durden
USDA Agricultural Research Service

Neochetina eichhorniae (left) and N. bruchi (right)

0002076
Willey Durden
USDA Agricultural Research Service

Late-stage larva feed at the base of leaf petioles often damaging a subtending axillary buds

0002077
Willey Durden
USDA Agricultural Research Service

plants stressed by weevils tend to be of small stature and lose buoyancy

0002078
Martin P. Hill
ARC - Plant Protection Research Institute

0002079
Carina J. Cilliers
ARC - Plant Protection Research Institute

A mat in South Africa in decline due to infestation; at Clairwood Quarry

0002080
Willey Durden
USDA Agricultural Research Service

late instar

0002081
Willey Durden
USDA Agricultural Research Service

male

0002082
Willey Durden
USDA Agricultural Research Service

with larval mines and exit hole

0002083
John Stanley
Commonwealth Scientific and Industrial Research Organization

0002084
Martin P. Hill
ARC - Plant Protection Research Institute

0002085
Christine A. Bennett
USDA Agricultural Research Service

quarantine on leaf

0002086
Hugo A. Cordo
USDA ARS - South American Biological Control Laboratory

to leaf petiole caused by larvae

0002087
I.G. (Hardi) Oberholzer
ARC - Plant Protection Research Institute

0002088
I.G. (Hardi) Oberholzer
ARC - Plant Protection Research Institute

0002089
I.G. (Hardi) Oberholzer
ARC - Plant Protection Research Institute

feeds on leaves producing a characteristic "tattered" appearance

0002090
Willey Durden
USDA Agricultural Research Service

0002091
Stefan Neser
ARC - Plant Protection Research Institute

late instar

0002092
Stefan Neser
ARC - Plant Protection Research Institute

0002093
Hugo A. Cordo
USDA ARS - South American Biological Control Laboratory

extensive damage, Spring 1999

0002094
Christine A. Bennett
USDA Agricultural Research Service

0002095
Hugo A. Cordo
USDA ARS - South American Biological Control Laboratory

0002131
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

0002096
Mic Julien
Commonwealth Scientific and Industrial Research Organization

Lake Victoria at Kisumu Yacht Club

0002097
Mic Julien
Commonwealth Scientific and Industrial Research Organization

was released, (before release) at Lake Victoria at Kisumu Yacht Club

0002098
Ken L S Harley
Commonwealth Scientific and Industrial Research Organization

was released, (before release) at Lake Victoria at Port Bell

0002099
Mic Julien
Commonwealth Scientific and Industrial Research Organization

was released,(after release) at Lake Victoria at Port Bell