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Showing 1 to 7 of 7 for “"Carduus nutans"”.
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Aspects of the biology of the receptacle weevil, Rhinocyllus conicus (Froehlich) relating to its role as a biocontrol agent of nodding thistle, Carduus nutans L.
… conicus (receptacle weevil) and growth forms of Carduus nutans (nodding thistle) from Nov. 1988 to June 1990 at Galatea in the central Bay of Plenty and on the coast at Whakatane. The dates of first emergence of adults in the spring, disappearance of the last adults in early summer, reappearance …
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An analysis of the establishment and impact of an exotic insect, Rhinocyllus conicus Froehling (Coleoptera: Curculionidae), on Carduus nutans L. and Carduus acanthoides L. (Campanulatae: Compositae) in Virginia with notes on their biologies
… conicus as a biological control agent for Carduus nutans and C. acanthoides in Virginia. Over an 81 day range, 25 females oviposited an average of 100.5 eggs. Life expectancy did not differ between sexes. Examination of 1999 C. nutans plants in Pulaski Co. showed: 26.7% of all blooms were …
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A Comparison of the Viability of Thistle Weevils From Fire Ant Suppressed Site to Weevils From a Site Where Fire Ants Were Not Suppressed
… non-native species, the musk thistle,<em> Carduus nutans</em>. Musk thistle are noxious weeds of pastures which reduce forage for grazing livestock. A high weevil population is necessary to achieve control of musk thistle. The study site is situated at the southernmost boundary of the …
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The Effects of Multispecies Grazing on Pasture Management and Utilization
… lower leaf numbers per thistle plant (Carduus nutans L.) than cattle only treatment. Based on this study, sequential and simultaneous grazing of cattle and goats may be an effective nodding thistle control strategy, but future experimentation is needed for determination of forage …
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An Evaluation of a Low-Cost UAV Approach to Noxious Weed Mapping
… Two noxious weeds were studied: musk thistle (Carduus nutans) and dalmation toadflax (Linaria dalmatica). The musk thistle was visually identifiable in the imagery but the dalmation toadflax was confused with yellow sweet clover (Melilotus officinalis). It was found that after the automated …
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Impact of Rhinocyllus conicus Froelich (Coleoptera:Curculioniadae) on the reproduction of Carduus thistles in Virginia
Musk thistle (Carduus nutans) seed production from early developing (terminal and first lateral) heads was reduced by 10% in 1973 and 75% in 1974 due to larval feeding of Rhinocyllus conicus. This was caused by heavy infestation of the early heads (45% in 1973, 70% in 1974) with a subsequent 5-fold …
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Integrated control of Carduus thistles and ecological studies on Rhinocyllus conicus Froelich and Ceuthorhynchidius horridus (Panzer)
A biological and integrated control program for Carduus thistles was developed using the biological control agents Rhinocyllus conicus Froelich and Ceuthorhynchidius horridus (Panzer) and the herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D). Field studies on the development of Ceuthorhynchidius …