QUANTIFICATION OF THE IMPACT OF HOVERFLIES (DIPTERA, SYRPHIDAE) ON CEREAL APHIDS IN WINTER-WHEAT - AN ANALYSIS OF FIELD POPULATIONS
QUANTIFICATION OF THE IMPACT OF HOVERFLIES (DIPTERA, SYRPHIDAE) ON CEREAL APHIDS IN WINTER-WHEAT - AN ANALYSIS OF FIELD POPULATIONS
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DOI：
10.2307/2403942
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发表时间：
1986-12-01
影响因子：
5.7
通讯作者：
ADAMS, THL
中科院分区：
文献类型：
--
作者：
CHAMBERS, RJ;ADAMS, THL
(1) An analysis of predation of cereal aphids by syrphid larvae is described. The analysis uses field data on the absolute densities of predator and pey in winter wheat crops in Sussex [UK] in 1981 and 1982. The method calculates and compares two quantities: the estimated kill rate by syrphid larvae, and the kill required to provide the degree of control observed in the aphid population. (2) This approach provides a separate analysis for each weekly sampling interval to identify when predation was most effective, and permits an initial appraisal of the impact of other antagonists acting concurrently. The method indicates clearly if syrphids were sufficiently numerous to achieve control alone or, alternatively, if they were too few to have had any significant effect on the aphid population. (3) Syrphid larvae and the potential to halt the aphid increase in four of the six field populations analysed.
