Larval Bradysia impatiens (Diptera: Sciaridae) Potential for Vectoring Pythium Root Rot Pathogens

A series of laboratory experiments were conducted to investigate the capacity of Bradysia impatiens (Johannsen) larvae to ingest propagules from two strains each of Pythium aphanidermatum (Edson) Fitzp. and P. ultimum Trow and transmit the pathogens to healthy geranium seedlings on a filter-paper su...

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Bibliographic Details
Published in:Phytopathology 2012-03, Vol.102 (3), p.283-289
Main Authors: BRAUN, S. E, SANDERSON, J. P, WRAIGHT, S. P
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Bradysia impatiens
Digestive tract
Diptera
Diptera - parasitology
Disease transmission
Fundamental and applied biological sciences. Psychology
Geranium
Geranium - parasitology
Germination
Larva - parasitology
Oospores
Pathogens
Phytopathology. Animal pests. Plant and forest protection
Plant Diseases - parasitology
Plant Roots - parasitology
Propagules
Pythium
Pythium - cytology
Pythium - physiology
Pythium aphanidermatum
Root rot
Sciaridae
Seedlings
Seedlings - parasitology
Spores
Vectors
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Summary:A series of laboratory experiments were conducted to investigate the capacity of Bradysia impatiens (Johannsen) larvae to ingest propagules from two strains each of Pythium aphanidermatum (Edson) Fitzp. and P. ultimum Trow and transmit the pathogens to healthy geranium seedlings on a filter-paper substrate in petri dishes. The capacity of fungus gnat larvae to transmit P. aphanidermatum to seedlings rooted in a commercial peat-based potting mix and germination of Pythium oospores and hyphal swellings before and after passage through the guts of larval fungus gnats were also examined. Assays revealed that Pythium spp. transmission by larval fungus gnats varied greatly with the assay substrate and also with the number and nature of ingested propagules. Transmission was highest (65%) in the petri dish assays testing larvae fed P. aphanidermatum K-13, a strain that produced abundant oospores. Transmission of strain K-13 was much lower (
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO-09-11-0262