Dactylaria higginsii,a Fungal Bioherbicide Agent for Purple Nutsedge (Cyperus rotundus) |
| |
| Institution: | 1. Palacký University in Olomouc, Faculty of Science, Department of Botany, ?lechtitel? 27, 783 71 Olomouc-Holice, Czech Republic;2. Institute of Evolution, University of Haifa, Mt. Carmel, Haifa 3498838, Israel;1. Department of Chemical Engineering - Federal University of Santa Maria, Av. Roraima, 1000, Santa Maria, RS 97105-900, Brazil;2. Laboratory of Agricultural Processes Engineering (LAPE), Federal University of Santa Maria, Cachoeira do Sul 96506-322, Brazil;3. Laboratório de Bioquímica Fitopatológica, Instituto Biológico, Av. Conselheiro Rodrigues Alves 1252, São Paulo, SP 04014-002, Brazil;1. Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Characteristic Plant Extraction Laboratory, Functional Molecules Analysis and Biotransformation Key Laboratory of Universities in Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, PR China;2. Dali University, Dali, 671003, PR China;1. School of Biological Sciences, Knight Building, University of Reading, RG6 6AJ, UK;2. School of Agriculture, Policy and Development, University of Reading, RG6 6AR, UK;3. Soil Research Centre, School of Archaeology, Geography and Environmental Science, University of Reading, RG6 6AB, UK |
| |
| Abstract: | Ten different fungi recovered from diseased purple nutsedge and yellow nutsedge plants collected in several locations in Florida and southeastern United States were screened for pathogenicity to purple nutsedge (Cyperus rotundus) plants. Only Dactylaria higginsii, recovered from diseased purple nutsedge plants collected in Gainesville, caused disease in greenhouse trials. Based on the results of pathogenicity and host-range tests conducted in a greenhouse, D. higginsii was determined to have potential as a bioherbicide agent for purple nutsedge. It was highly pathogenic to purple nutsedge, yellow nutsedge (C. esculentus), annual sedge (C. compressus), globe sedge (C. globulosus), rice flatsedge (C. iria), and green kyllinga (Kyllinga brevifolia =Cyperus brevifolius]). Initial symptoms on inoculated plants consisted of moist, dark-brown leaf spots that appeared 4 days after inoculation. The spots later coalesced into larger lesions and blotches, killing the leaves and sometimes the entire aerial parts. The fungus sporulated on the infected leaves and caused secondary infections on the emerging leaves and shoots within 20 to 28 days after inoculation. Inoculation with conidial suspensions of D. higginsii resulted in significant reductions in shoot numbers (72%), shoot dry weight (73%), and tuber dry weight (67%) of greenhouse-grown purple nutsedge plants 45 days after inoculation. The fungus did not infect any of the crop plants or weedy grasses (Poaceae) tested. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
