Results 101 to 110 of about 509 (144)

Control of Waterhyacinth (Eichhornia crassipes) withNeochetina eichhorniae(Coleoptera: Curculionidae) and a Growth Retardant

Weed Science, 1982
Waterhyacinth [Eichhornia crassipes(Mart.) Solms] grown in screen-enclosed, outdoor aquaria were treated with factorial combinations of 0, 0.75, 1.5, or 3 kg/ha of the experimental growth retardant EL-509 [α-(4-chlorophenyl)-α-(1-methylethyl)-5-pyrimidine-methanol] and zero, one, two, or three pairs of waterhyacinth weevils (Neochetina ...
Ted D. Center, Kerry K. Steward, Marc C. Bruner   +2 more
openaire   +1 more source

Observations on the effect of the weevils Neochetina eichhorniae Warner and Neochetina bruchi Hustache on the growth of water hyacinth

Hydrobiologia, 1984
Water hyacinth Eichhornia crassipes (Mart.) Solms. is an aquatic weed that infests most of the White Nile system in the Sudan. Serious economical and ecological problems are caused by this weed. The two weevils Neochetina eichhorniae and Neochetina bruchi were imported and released in an attempted biological control against the weed.
M. O. Bashir, Z. E. El Abjar, N. S. Irving   +2 more
openaire   +1 more source

Predicting Population Intensity of Adult Neochetina eichhorniae (Coleoptera: Curculionidae) from Incidence of Feeding on Leaves of Waterhyacinth, Eichhornia crassipes

Environmental Entomology, 1984
Examination of data from Florida (United States) and Queensland (Australia) revealed a close relationship between numbers of adult waterhyacinth weevils ( Neochettna etchhomtae Warner) and the number of feeding scars on waterhyacinth leaves. Regression analysis produced nearly identical results for samples from both countries even though data ...
A. D. Wright, T. D. Center
openaire   +1 more source

Adaptability of two weevils (Neochetina bruchi and Neochetina eichhorniae) with potential to control water hyacinth in the Rift Valley of Ethiopia

Crop Protection, 2015
Abstract Neochetina weevils have potential as biocontrol agents for water hyacinth, an aquatic weed which seriously affects irrigation water supply in sugarcane, vegetables and other horticultural crop production in the Rift Valley of Ethiopia. A study was conducted on (i) the adaptability and duration of developmental stages of Neochetina weevils ...
Firehun, Y., Struik, P.C., Lantinga, E.A., Taye, T.   +3 more
openaire   +1 more source

Biological control of waterhyacinth in Sinaloa Mexico with the weevils Neochetina eichhorniae and N. bruchi

BioControl, 2003
Water hyacinth (Eichhornia crassipes (Mart.) Solms.)creates severe problems in the irrigationdistricts of Mexico, particularly in westernSinaloa. Therefore water hyacinth weevils(Neochetina eichhorniae Warner and N. bruchi Hustache), imported from the USA in1993, were used to initiate a biologicalcontrol program.
José Angel Aguilar, Ovidio M. Camarena, Ted D. Center, Germán Bojórquez   +3 more
openaire   +1 more source

Effects of Herbicide Application on Mortality and Dispersive Behavior of the Water Hyacinth Weevils, Neochetina eichhorniae and Neochetina bruchi (Coleoptera: Curculionidae)

Environmental Entomology, 1986
Toxicities of commonly used water hyacinth herbicides and additives to water hyacinth weevils, Neochetina eichhorniae Warner and N. bruchi Hustache, were tested in the laboratory. Weevils were either sprayed while on water hyacinth plants or dipped directly into the compounds tested.
openaire   +1 more source

Effect of Paclobutrazol and Waterhyacinth Weevil (Neochetina eichhorniae) on Plant Growth and Leaf Dynamics of Waterhyacinth (Eichhornia crassipes)

Weed Science, 1994
Waterhyacinths grown outdoors were treated with combinations of 0 or 22 kg ai ha-1of the plant growth retardant paclobutrazol and 0, 25, or 250 waterhyacinth weevils per culture tank under conditions of low (25% coverage) or high (100% coverage) plant densities. The low plant density treatments simulated a regrowth or colonization situation.
Thai K. Van, Ted D. Center
openaire   +1 more source

Biocontrol of Water Hyacinth: Insights into Neochetina eichhorniae Warner and N. bruchi Hustache

UTTAR PRADESH JOURNAL OF ZOOLOGY
Eichhornia crassipes (water hyacinth) is one of the world’s most invasive aquatic weeds, posing severe ecological, economic, and social challenges in infested regions. Among the various management strategies, the curculionid weevils Neochetina eichhorniae and N.
Borkakati, Rudra Narayan, Rahman, Naseema, Bordoloi, Pabitra Kumar   +2 more
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Effect oforthogalumna terebrantis [Acari: Galumnidae] on neochetina eichhorniae [col. curculionidae] eggs and oviposition

Entomophaga, 1977
Adult waterhyacinth mites,Orthogalumna terebrantisWallwork, did not consume eggs of the mottled waterhyacinth weevil,Neochetina eichhorniaeWarner, under 4 temperature regimes (viz. 5°–25°, 10°–30°, 15°–35° and 20°–40° C). Microscopic examination showed that mites did not feed or attempt to feed on weevil eggs and they starved when weevil eggs were the ...
openaire   +1 more source

Age and Phytochemical Composition of Waterhyacinth (Pontederiaceae) Leaves Determine their Acceptability to Neochetina eichhorniae (Coleoptera: Curculionidae

Environmental Entomology, 1991
Behavior of the weevil Neochetina eichhorniae Warner, a specialist herbivore, varied with leaf age of waterhyacinth ( Eichhornia crassipes (Mart.) Solms-Laubach [Pontederiaceae]). In the field, adult feeding decreased as the leaves aged. Accrued feeding damage on 8-d-old leaves was only about 60% of the sum of two respective sets of 4-d-old leaves ...
T. D. Center, A. D. Wright
openaire   +1 more source