caa a22 4500 475834658 CHVBK 20180406123850.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1026528304473 doi (NATIONALLICENCE)springer-10.1023/A:1026528304473 Impact of defoliation by the biocontrol agentZygogramma bicolorataon the weed Partheniumhysterophorus in Australia [Elektronische Daten] [K. Dhileepan, S.D. Setter, R.E. McFadyen] The leaf-feeding beetle Zygogrammabicolorata Pallister was introduced from Mexico intoAustralia in 1980 as a biocontrol agent for the weedParthenium hysterophorus L. (Asteraceae). Z. bicolorata became abundant in 1990, and since 1992there has been regular outbreaks resulting in thedefoliation of the weed in central Queensland. In thisstudy we evaluated the impact of defoliation by Z. bicolorata on P. hysterophorus from 1996 to1998. Z. bicolorata caused 91-100% defoliationresulting in reductions in weed density by 32-93%,plant height by 18-65%, plant biomass by 55-89%,flower production by 75-100%, soil seed-bank by13-86% and seedling emergence in the following seasonby 73-90%. At sites with continued outbreaks ofZ. bicolorata, it is expected that the existing soilseed-bank will be minimised, resulting in reduceddensity of parthenium in 6 to 7 years. Kluwer Academic Publishers, 2000 biocontrol nationallicence defoliation nationallicence herbivory nationallicence impact assessment nationallicence weed nationallicence Asteraceae nationallicence Coleoptera nationallicence Parthenium hysterophorus nationallicence Zygogramma bicolorata nationallicence Dhileepan K. QueenslandDepartment of Natural Resources, Charters Towers, Tropical Weeds Research Centre, Qld, Australia aut Setter S.D. QueenslandDepartment of Natural Resources, Charters Towers, Tropical Weeds Research Centre, Qld, Australia aut McFadyen R.E. QueenslandDepartment of Natural Resources, Sherwood, Alan Fletcher Research Station, Qld, Australia aut BioControl Kluwer Academic Publishers 45/4(2000-12-01), 501-512 1386-6141 45:4<501 2000 45 10526 https://doi.org/10.1023/A:1026528304473 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026528304473 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dhileepan K. QueenslandDepartment of Natural Resources, Charters Towers, Tropical Weeds Research Centre, Qld, Australia aut NATIONALLICENCE 700 1- Setter S.D. QueenslandDepartment of Natural Resources, Charters Towers, Tropical Weeds Research Centre, Qld, Australia aut NATIONALLICENCE 700 1- McFadyen R.E. QueenslandDepartment of Natural Resources, Sherwood, Alan Fletcher Research Station, Qld, Australia aut NATIONALLICENCE 773 0- BioControl Kluwer Academic Publishers 45/4(2000-12-01), 501-512 1386-6141 45:4<501 2000 45 10526 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer