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Wachstum von Emex australis außerhalb der Hauptvegetationsperiode – Bedeutung für die biologische Bekúmpfung dieses einjúhrigen Unkrauts
Author(s) -
PANETTA F. D.
Publication year - 1990
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1990.tb01702.x
Subject(s) - irrigation , biology , sowing , agronomy , competition (biology) , interspecific competition , growing season , weed , dormancy , seedling , germination , weed control , horticulture , ecology
Summary: Populations of the winter annual Emex australis were established by initiating irrigation at monthly intervals, beginning in mid‐summer. Natural seedling densities varied from 100 m −2 when irrigation was begun during late January to almost 700 m −2 when it began at the end of March. Densities were increased by sowing non‐dormant seeds, but most sown seeds became dormant when introduced before autumn. Plants which emerged after the earliest irrigation grew most rapidly. Those originating from the latest irrigation grew most slowly, in association with vigorous growth of other annual species. Because it minimizes interspecific competition, early commencement of irrigation, coupled with sowings of nondormant seeds is the best method for establishing E. australis during summer. Maintenance of such populations may enhance the persistence of non‐aestivating biological control agents and/or boost their numbers prior to the onset of mass germination. This approach could also prove useful for other winter annuals which are targeted for biological control.