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Assessment of Paulinia acuminata [Orthoptera: Acrididae] for the biological control of Salvinia molesta in Australia

by Sands, D.P.A; Kassulke, R.C.
Publisher: 1986Subject(s): CONTROL BIOLOGICO | PAULINIA ACUMINATA | MALEZAS ACUATICAS | ORGANISMOS PARA CONTROL BIOLOGICO | CICLO VITAL | DISTRIBUCION NATURAL | SALVINIA | HOSPEDEROS | AFRICA | AUSTRALIA | BIOLOGICAL CONTROL | AQUATIC WEEDS | BIOLOGICAL CONTROL ORGANISMS | LIFE CYCLE | NATURAL DISTRIBUTION | SALVINIA | AFRICA | AUSTRALIA | LUTTE BIOLOGIQUE | MAUVAISE HERBE AQUATIQUE | AUXILIAIRE DE LUTTE BIOLOGIQUE | CYCLE DE DEVELOPPEMENT | DISTRIBUTION NATURELLE | SALVINIA | AFRIQUE | AUSTRALIE In: Entomophoga (Francia) v. 31(1) p. 11-17Summary: The biology and host specificity of the aquatic grasshopper, Paulinia acuminata (De Geer) were studied in quarantine in Australia. Adults and nymphs fed on the leaves of salvinia (Salvinia molesta), water lettuce (Pistia stratiotes) and azolla (Azolla pinnata). Fifty-three plant species representing 38 families were exposed to adults and nymphs of P. acuminata. Adult feeding occurred on 17 plants but nymphs failed to feed on 9 of these species in the presence of S. molesta. In starvation trials, 14 plants (excluding S. molesta, P. stratiotes and A. pinnata) were attacked by adults, of which only 5 were attacked by nymphs. Heavy feeding occurred on strawberry (Fragaria x ananassa) but not oviposition occurred even when the leaves were held in contact with the water surface. The life cycle of P. acuminata was completed only on S. molesta, P. stratiotes and A. pinnata. Eggs deposited on water hyacinth (Eichhornia crassipes) failed to hatch. Laboratory evaluation was supplemented with observations on the distribution and abundance of P. acuminata on the Zambezi River system, Zimbabwe, during October 1984
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3 tab.; 14 ref. Sum. (En, Fr)

The biology and host specificity of the aquatic grasshopper, Paulinia acuminata (De Geer) were studied in quarantine in Australia. Adults and nymphs fed on the leaves of salvinia (Salvinia molesta), water lettuce (Pistia stratiotes) and azolla (Azolla pinnata). Fifty-three plant species representing 38 families were exposed to adults and nymphs of P. acuminata. Adult feeding occurred on 17 plants but nymphs failed to feed on 9 of these species in the presence of S. molesta. In starvation trials, 14 plants (excluding S. molesta, P. stratiotes and A. pinnata) were attacked by adults, of which only 5 were attacked by nymphs. Heavy feeding occurred on strawberry (Fragaria x ananassa) but not oviposition occurred even when the leaves were held in contact with the water surface. The life cycle of P. acuminata was completed only on S. molesta, P. stratiotes and A. pinnata. Eggs deposited on water hyacinth (Eichhornia crassipes) failed to hatch. Laboratory evaluation was supplemented with observations on the distribution and abundance of P. acuminata on the Zambezi River system, Zimbabwe, during October 1984

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