Effect of Escherichia Coli on Erisilkworm. Philosamia Cynthia Ricini

Author: S. S. Huang, Y. F. Yen, T. S. Miu

Abstract：

From the review of the literature, it is apparent the Escherichia coli, is an important organism among the tribe Eschericheae, to cause the disease of insect. It was substantially demonstrated in the earlier reports that E. coli was the pathogen for silkworm, as well as for wax moth. However, as the result indicated in the pre-sent investigation, Eri-silkworm, Philosamia cynthia ricini Boisdu-val is non-susceptible to E. coli so far studied.
After oral ingestion and body cavity injection of bacterial sus-pension, the larvae fed normally and continued their development. The concentration used was approximately 1,200,000 to 3,000,000 bacterial cells per larva.
As observed from the histological study of alimentary tract there was no pathological change. The number of blood cells had no great change between treated and untreated larvae as well.
E. coli is not a pathogen for Eri-silkworm, why? It may be concerned with three factors: Host, pathogen, and environment. If this is the problem that remains for further study.

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