Letter | Published:

Two Symbiotes of Psylla mali

Nature volume 159, page 749 (31 May 1947) | Download Citation



As a representative of Psyllid I selected Psylla mali, which, feeding on the apple tree, was easily available for investigation, and also for confirmatory work by other investigators. Profft1 has published the best account that has appeared on symbiosis in this group of insects. On p. 312, in Fig. 19, he illustrates a section of the bacteriotome, called by him, in conformity with others, a mycetome. Unfortunately, the magnification of the section is only 165, which is exceptionally low for any cytological study. Further, he does not give any illustration of the symbiotes as seen in a smear of the tumour. In his illustration the majority of the tumour cells contain curved dark-staining objects. When I studied them in smears, stained with Giemsa, they appeared to be thick comma-shaped bacteria.

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  1. 1.

    Z. Morph. u. Okol., 32, 312 (1937).

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  1. Research Institute, Osmania University, Hyderabad. March 5.



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