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Research
5.
Fungal spread and faecal decomposition as
indicators to evaluate short term environmental
impact of egg parasitic fungi, Paecilomyces
lilacinus and Verticillium chlamydosporium -
R. K. Singh, P. K. Sanyal
Vet World. 2011; 4(4): 168-170
doi:
10.5455/vetworld.2011.168-170
Abstract
Experiments were conducted to understand the
extent of spread of Paecilomyces lilacinus and
Verticillium chlamydosporium once deposited in
faeces and alteration, if any, of the organic
content of faeces by them, which could serve as
evidences of their short-term environmental
impact. Coproculture of the central part and two
concentric rings of both the fungus contaminated
plots were undertaken twice a week for four weeks
in laboratory for the presence of P. lilacinus and
V. chlamydosporium. Subcultures were done until
the confirmation of desired fungus occur.
Paecilomyces lilacinus could not be reisolated
from the central part and two concentric rings at
any point of sampling period except from the
faecal sample of the central part on day 0.
Verticillium chlamydosporium could be re-isolated
from the faeces deposited at the central part on
day 0, 7 and 14 but never from 21st day of
sampling onward. However, V. chlamydosporium could
not be recovered from the faeces of two concentric
rings at any point of sampling. Moisture contents
decreased with corresponding increase in dry
matter content of the faeces as the time
progressed. Faeces mixed with P. lilacinus, V.
chlamydosporium and no fungus controls behaved
similarly in terms of moisture and dry matter
contents. From 60th day of deposition onwards, ash
contents of faeces mixed with P. lilacinus, V.
chlamydosporium and no fungus controls showed
increasing trend with the corresponding decreasing
trends in organic matter contents. Keywords:
Paecilomyces lilacinus, Verticillium
chlamydosporium, fungal spread, faecal
decomposition, environmental impact
