Effects of Harvest on Survival and Dispersal of Insect Predators in Hay Lucerne
作者:
Z. Hossain,
G.M. Gurr,
S.D. Wratten,
期刊:
Biological Agriculture & Horticulture
(Taylor Available online 2000)
卷期:
Volume 17,
issue 4
页码: 339-348
ISSN:0144-8765
年代: 2000
DOI:10.1080/01448765.2000.9754854
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The short-term effects of harvesting on survival and dispersal of insect predators in hay lucerne(Medicago sativaL.) were investigated in a commercial crop in Australia. Adults of two coleopterans, transverse ladybird beetle (Coccinella transversalisFabricius Coccinellidae) and pollen beetle(Dicranolaius bellulus(Guérin-Méneville) Melyridae), and one heteropteran, spined predatory shield bug (Oechalia schellembergii(Guérin-Méneville) Pentatomidae), were marked and released into lucerne strips immediately before they were cut for hay. Vacuum sampling of the stubble immediately after harvest showed that proportional mortalities were 0.16, 0.00 and 0.07 respectively. Proportions of the released individuals that were recovered alive were 0.66 for C.transversalis, 0.45 forO. schellembergiiand 0.02 forD. bellulus.The proportion of predators that were not recaptured from release areas was greatest forD. bellulus(0.80). To assess dispersal after harvest, 12 strips of lucerne were left uncut within the field in which the marked insects had been released. Intensive sweep-net sampling of these strips caught marked survivors of all three predators. The numbers of insects caught in strips declined with increasing distance from the release point. Many insect predators, therefore, survived harvesting and, if uncut refuge strips are provided, the within-field community of biological control agents is largely preserved.
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