Effect of various liquid culture media on morphology,growth, propagule production,and pathogenic activity to Bemisia argentifolii of the entomopathogenic Hyphomycete,Paecilomyces fumosoroseus |
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Authors: | Vidal Claire Fargues Jacques Lacey Lawrence A Jackson Mark A |
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Institution: | (1) Unité de Recherches en Lutte Biologique, Institut National de la Recherche Agronomique, Campus International de Baillarguet, 34982 Montferrier-sur-Lez cedex, France;(2) European Biological Control Laboratory, USDA-ARS, Parc Scientifique II Agropolis, 34397 Montpellier cedex 5, France;(3) National Center for Agricultural Utilization Research, ARS- USDA, IL, 61604, U.S.A |
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Abstract: | The entomopathogenic Hyphomycete Paecilomyces fumosoroseus was grown in five different liquid media, which have been developed
for mass production of Beauveria spp. or P. fumosoroseus. Production was followed for 96 h by measuring both biomass and concentration
of propagules. Maximal biomass was obtained with two media, Jackson and Catroux media (40–60 mg ml-1 suspension produced after
42 h incubation), where the exponential phase of growth began earlier than in the other media. While high concentrations of
propagules (1.4–5.5 × 108 propagules ml-1) were produced in three media (Jackson, Paris, and Catroux media) after 48–72 h
incubation, production of propagules was lower in the two other media, containing maltose as carbon source (Goral and Kondryatiev
media) with 0.4–3.7 × 107 propagules ml-1 after 96 h incubation. P. fumosoroseus produced oblong blastospores in the three
most productive media and conidiospore-like (ovoid to subspherical) propagules in the two other media. Infection potential
of produced propagules was tested on the silverleaf whitefly ( Bemisia argentifolii). Whiteflies were sprayed as 2nd instars
with P. fumosoroseus propagules produced in the five liquid media (1.9 × 103 and 1.9 × 104 propagules cm-2). All the media
produced propagules that were infectious for larvae. With the lower dosage, mortality rates were significantly lower with
propagules produced in one of the two least productive media (57%) (in the Kondryatiev medium) compared to those obtained
with the three most productive media (>90%). However, when whiteflies were treated with the higher dosage, mortality rates
(91–99%) between media were not significantly different.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Bemisia argentifolii liquid media mass production microbial control Paecilomyces fumosoroseus propagule morphology |
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