Studies on Entomophthora in populations of Aphis fabae on field beans
Studies on Entomophthora in populations of Aphis fabae on field beans
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DOI：
10.1111/j.1744-7348.1980.tb03952.x
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发表时间：
1980-04
影响因子：
2.6
通讯作者：
N. Wilding;J. Perry
中科院分区：
文献类型：
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作者：
N. Wilding;J. Perry
摘要1973年，在Highfield，Rothamsted的一个地点，蚕豆蚜的种群数量比在Mill Dam Close，Woburn，Rothamsted西北29 km的一个同等地点早1周达到高峰。虫霉属的流行病导致每周最大死亡率的成年无翅目的71%，在海菲尔德和67%，在米尔大坝关闭。这些流行病和虫霉分生孢子在空气中的周期性与蚜虫种群的发展密切相关。几乎没有证据表明虫霉属感染与任何考虑的天气因素之间存在一致的关系。在这两个地点，大多数死亡是由E。planchoniana，但E. aphidis和E.暗房E. fresenii和E.但它杀死的蚜虫很少。空气中的分生孢子以E.蚜虫型。高达44%的从豆类作物中迁移的蚜虫感染了虫霉，证实蚜虫迁移是真菌分布的重要途径。蚜虫的数量上升到1600多个/厂在这两个网站，尽管虫霉的行动，可能会少了真菌更丰富的季节早些时候。
SUMMARY The population of Aphis fabae on field beans at a site in Highfield, Rothamsted in 1973 reached its peak 1 wk earlier than that at an equivalent site in Mill Dam Close, Woburn, 29 km NW of Rothamsted. Epizootics of Entomophthora caused weekly maximum mortalities of adult apterae of 71% at Highfield and 67% at Mill Dam Close. These epizootics and the periodicity of Entomophthora conidia in the air closely paralleled the development of the aphid population. There was little evidence of a consistent relationship between Entomophthora infection and any of the weather factors considered. At both sites most mortality was caused by E. planchoniana though many aphids were killed by E. aphidis and E. obscura. E. fresenii and E. virulenta killed very few aphids. Most conidia in the air were of the E. aphidis-type. Up to 44% of alatae emigrating from bean crops were infected with Entomophthora, confirming that aphid migration is an important means of distributing the fungi. Aphid numbers rose to more than 1600/plant at both sites, in spite of the action of Entomophthora, and would probably have been less had the fungi been more abundant earlier in the season.