Fungal spread and faecal decomposition as indicators to evaluate short term environmental impact of egg parasitic fungi, Paecilomyces lilacinus and Verticillium chlamydosporium
2011
Singh, R. K. | Sanyal, P.K.
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.
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