Abstract
A new virus—like particle has been observed in haemolymph from Pseudaletia unipuncta (Haw. )A high degree of mortality was noticed on an epidemic population of the true army worm, Pseudaletia unipuncta (Haw. ) in La Sarre, Abitibi, Quebec.In a first approach, a few specimens of larvae were collected. Haemolymph was extracted for a preliminary observation under the electron microscope. The preparation technique was very simple. A 400 mesh formvar grid was put on top of a drop of haemolymph for a few seconds and was negatively stained with PTA 2% pH 7. 00.A huge number of spherical particles ( a count of nearly 2, 000 on one grid quadrat) were observed in this way.Conscious of our inexperience with insect viruses we consulted three specialists in comparative virology:
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