Sure, let's delve into the fascinating world of silk production and the diseases that can affect silkworms.

a. Microsporidiosis in Tasar Silkworm:
   - Period of Occurrence: Microsporidiosis typically occurs during the larval stage.
   - Characteristic Signs/Symptoms: Affected larvae exhibit slow growth, reduced silk production, and a whitish appearance due to the accumulation of spores. The disease is caused by microsporidian parasites.

b. Muscardine in Muga Silkworm:
   - Period of Occurrence: Muscardine usually occurs during the later larval stages.
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