BIOASSAY OF 4 ENTOMOPHTHORALEAN FUNGI (ENTOMOPHTHORALES) AGAINST DIURAPHIS-NOXIA AND METOPOLOPHIUM-DIRHODUM (HOMOPTERA, APHIDIDAE)

文献类型: 外文期刊

第一作者: FENG, MG

作者: FENG, MG;JOHNSON, JB

作者机构:

关键词: INSECTA;CEREAL APHIDS;ENTOMOPHTHORALES;BIOLOGICAL CONTROL

期刊名称:ENVIRONMENTAL ENTOMOLOGY ( 影响因子:2.377; 五年影响因子:2.298 )

ISSN: 0046-225X

年卷期: 1991 年 20 卷 1 期

页码:

收录情况: SCI

摘要: A spore shower technique was used to test four species of aphid-derived entomophthoralean fungi, Pandora neophidis (Remaudiere & Hennebert) Humber, Zoophthora radicans (Brefeld) Batko, Conidiobolus thromboides Drechsler, and Conidiobolus coronatus (Constantin) Batko, against the cereal aphids, Diuraphis noxia (Mordvilko) and Metopolophium dirhodum (Walker). Six endemic and five foreign isolates of the four fungal species were tested. There was variability in virulence among different isolates and species of the fungi and in susceptibility between the two aphid species. Low LC50's (i.e., high virulence) were produced with two C. coronatus isolates (2.2-4.0 spores/mm2), three C. thromboides isolates (2.3-13.2 spores/mm2), and two P. neoaphidis isolates (1.4-8.1 spores/mm2). Two Z. radicans isolates exhibited moderate virulence with LC50's ranging from 25.1 to 46.8 spores/mm2. Two isolates of C. thromboides that had been in long-term storage displayed relatively low virulence. Aphid colonies on leaves were more suitable for bioassays than aphids confined in wire mesh inoculation chambers. The latter were disadvantageous, because the aphid movement within the chamber adversely affected the determination of fungal inoculum exposure rates. These conditions also often induced the production of resting spores instead of primary conidia.

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