PHYLLOPLANE MYCOFLORA OF MULBERRY - A SOURCE OF INOCULUM TO ASPERGILLOSIS OF SILKWORM AND THEIR MANAGEMENT THROUGH BOTANICALS
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Date
2009-02-02
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University of Agricultural Sciences GKVK, Bangalore
Abstract
The studies on the “Phylloplane mycoflora of mulberry - a source of inoculum to
Aspergillosis of silkworm and their management through botanicals” was carried out
during 2007–09 at the Department of Sericulture, UAS, GKVK, Bangalore-65. The study
indicated that, the spatial distribution pattern of all the three species (Aspergillus
flavus, Aspergillus niger & Aspergillus terreus) of Aspergillus was very vivid with height
of the plant before and after rain in all the three mulberry ecosystems studied (Kolar
{Row system}, Ramanagaram and GKVK {Pit system}). The spatial distribution pattern of
A. flavus was more restricted to 15cm (2.67nos/ml) above the ground level compared to
other two species of Aspergillus. The in-vitro efficacy of botanical extracts on inhibition
zone of Aspergillus revealed significant results. The stock solution of Phyllanthus niruri
registered maximum zone of inhibition of 11.02mm followed by Adathoda vasica and
Terminalia arjuna. The in-vivo effect of botanical extracts on first, second and third
instar inoculated lots of PMxCSR2 and their subsequent growth revealed significant
results. However, P. niruri administered batches was recorded increased larval weight
(0.030, 0.113 and 0.598g/10), reduced moulting duration (19.85, 19.98, 22.03 and
31.63h), more ET50 (28.78, 50.33 and 73.00hrs) and increased ERR (79.78, 78.89 and
78.00%), spinning (85.11, 85.11 and 84.00%) and all the cocoon and post cocoon
parameters. Among three species of Aspergillus sprayed on I-IIIrd instar larvae there was
a significant difference with respect to larval, cocoon and post cocoon parameters.
Further, the highest larval weight (0.028, 0.106 and 0.615g/10), reduced moulting
duration (19.76, 19.88, 21.14 and 31.33h), ERR (75.50, 77.17 and 78.83%), spinning
(82.00, 84.50 and 84.50%), cocoon (1.70, 1.71 and 1.72g), shell (0.29, 0.28 and 0.29g),
pupal weights (1.35, 1.35 and 1.36g), shell ratio (16.87, 16.69 and 16.63%), silk
productivity (3.59, 3.56 and 3.53cg/day), filament length (872.50, 880.02 and 878.02m)
and eclosion (69.17, 74.17 and 76.67%) were observed with A. terreus batches followed
by A. niger and A. flavus. Whereas, A. flavus registered comparatively less ET50 for
symptom expression (25.83, 46.33 and 72.00h) and found highly pathogenic to all the
three instars, respectively.
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