18 research outputs found
Weevils associated with Pistia stratiotes L. (Araceae) in the Central Amazon Region, with new records for Argentinorhynchus Brèthes (Coleoptera, Curculionidae)
Toxic effect of herbicides used for water hyacinth control on two insects released for its biological control in South Africa
The integrated control of water hyacinth, Eichhornia crassipes (Martius) Solms-Laubach (Pontederiaceae) has become necessary in South Africa, as biological control alone is perceived to be too slow in controlling the weed. In total, seven insect biological control agents have been released on water hyacinth in South Africa. At the same time, herbicides are applied by the water authorities in areas where the weed continues to be troublesome. This study investigated the assumption that the two control methods are compatible by testing the direct toxicity of a range of herbicide formulations and surfactants on two of the biological control agents released against water hyacinth, the weevil, Neochetina eichhorniae Warner (Coleoptera: Curculionidae) and the water hyacinth mirid,Eccritotarsus catarinensis (Carvalho) (Hemiptera: Miridae). A number of the formulations used resulted in significant mortality of the mirid and the weevil. Products containing 2,4-D amine and diquat as active ingredients caused higher mortality of both agents (up to 80% for the mirid) than formulations containing glyphosate. Furthermore, when surfactants were added to enhance herbicide efficiency, it resulted in increased toxicity to the insects. We recommend that glyphosate formulations should be used in integrated control programmes, and that surfactants be avoided in order to reduce the toxic nature of spray formulations to the insect biological control agents released against water hyacinth
Isozymic discrimination of tropical Australian populations of mesquite (Prosopis spp.): implications for biological control
Lessons from three cases of biological control of native freshwater macrophytes isolated from their natural enemies
Bionomics of Aphis chloris Koch (Hemiptera: Aphididae) for biological control of St John's wort in Australia
Host discrimination in Dinocampus coccinellae (Hymenoptera: Braconidae), a solitary parasitoid of coccinellid beetles.
The aggregation pheromone of Diorhabda elongata, a biological control agent of saltcedar(Tamarix spp.): identification of two behaviorally active components
Screening for resistance against Myzus persicae and Macrosiphum euphorbiae among wild Solanum
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