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823
Botrytes cinerea, exmplifying the aerobic fungus decomposing the cellulose.
Vegetation of the mycelium : Formation of conides. Formation of sclerosis. Development of ascophor. Decomposing activities of cellulose.
PLANT PATHOLOGY
I. — Disease produced by protozoid.
First, photographs of plants afflicted with flagellates will be projected. Some speciemens of Euphorbia that are known to suffer from a similar disease would suit this purpose. The film illustrating Herpetomonas (Leptoraonas) Davidi Lafont, or similar species, in the latex tubes should be taken under the high power microscope, so as to show the flagelli in motion.
The transmission of flagellates in to the Euphorbia by means of injections of Hemipteri such as Nysius Euphorbiae Horv., Dieuches humilis Rent, on Stenocephalus agilis Scop, might be taken at a suitable season. The presence of flagellates (dwarf forms) in the digestive tube and the salivary glands of the above mentioned insects may be shown by means of preparations' taken from vivisection.
The gradual progression of the alteration of the zone of tissues surrounding the point of inoculation may be shown, more particularly in coloured films as in some cases the initial black spot is surrounded by a yellow halo which dilates into a red zone.
II. — Diseases produced by Bacteria.
Olive Tubercolosis (Bacterium Savastanoi E. Smith).
Pictures of one or two olive plants damaged by Tubercolosis.
Enlarged projection of twigs with bacterial tumours in different stages of development.
Enlarged propection of leaves and roots afflicted by Tubercolosis.
The Bacterium Savastanoi in pure culture, on solid and liquid ground work (motile form seen through the high power microscope).
Various stages of development of a tumour. Section of a tumour seen through the microscope, showing gaps in the tissues affected by bacteria.
The presence of Bacteria in wooden vessels. Experimental reproduction of the disease. Picture of a Laboratory of Plant Disease, in which a phytopathologist inoculates healthy olive plants in pots with the Bacterium Savastanoi, taken from bacteria in pure culture.
Picture of the gradual formation of tumours after the inoculation. Films resembling the preceding ones mav illustrate other diseases produced by