Horizontal transmission of entomopathogenic fungi by the diamondback moth

Furlong, M. J. and Pell, J. K. (2001) Horizontal transmission of entomopathogenic fungi by the diamondback moth. Biological Control, 22 3: 288-299. doi:10.1006/bcon.2001.0981


Author Furlong, M. J.
Pell, J. K.
Title Horizontal transmission of entomopathogenic fungi by the diamondback moth
Journal name Biological Control   Check publisher's open access policy
ISSN 1049-9644
Publication date 2001-01-01
Year available 2017
Sub-type Article (original research)
DOI 10.1006/bcon.2001.0981
Open Access Status Not Open Access
Volume 22
Issue 3
Start page 288
End page 299
Total pages 12
Place of publication San Diego, CA, USA
Publisher Academic Press
Language eng
Subject C1
300303 Plant Protection (Pests, Diseases and Weeds)
620400 Primary Products From Plants
0608 Zoology
Abstract The relative potential of the pathogenic fungi Beauveria bassiana and Zoophthora radicans for use as autodisseminated biological control agents of the diamondback moth (Plutella xylostella) was compared. The LC50 of B. bassiana conidia to third instar larvae was 499 conidia/mm(2) of leaf surface and individual cadavers of mycosed fourth instar larvae yielded a mean of 67.5 X 10(6) (+/- 7.5 x 10(6)) conidia. All concentrations of B. bassiana tested in inoculation chambers (0.24, 2.4, and 6.2 mug/mm(2)) induced 100% mortality in adult male moths within 7 days. The times to death and sporulation were concentration and exposure duration dependent. A standard procedure for inoculating male moths resulted in > 85% mortality from Z. radicans and > 93% mortality from B. bassiana. Pairing of inoculated males with clean moths of both sexes yielded higher rates of passive transmission of B. bassiana than Z. radicans, but there was no evidence for sexual transmission of either pathogen. Similarly, B. bassiana was more effectively transmitted from inoculated male moths to larvae foraging on whole plants. Single sporulating cadavers producing B. bassiana or Z. radicans conidia placed on plants infested with larvae resulted in a similar rate of transmission for both pathogens. However, an increase of the density of sporulating cadavers from one to three/plant increased Z. radicans transmission (greater than fourfold) but had no effect on B. bassiana transmission. Simultaneous inoculations of larvae with conidia of both fungi reduced the mortality induced by each pathogen, the reduction being most acute for B. bassiana-induced mortality. Inoculation of adults with both fungi showed that, at concentrations required for effective passive transmission to larvae, B. bassiana severely inhibited Z. radicans mycosis in adults. (C) 2001 Academic Press.
Keyword Biotechnology & Applied Microbiology
Entomology
Plutella Xylostella
Beauveria Bassiana
Zoophthora Radicans
Transmission
Biological Control
Autodissemination
Plutella-xylostella Lepidoptera
Zoophthora-radicans Brefeld
In-field Populations
Bacillus-thuringiensis
Beauveria-bassiana
Pheromone Trap
Entomophthorales
Resistance
Yponomeutidae
Parasitoids
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 02:50:21 EST