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Extracts From The Department Of Agriculture's Annual Report, 1974-75, Department Of Agriculture, Western Australia
Extracts From The Department Of Agriculture's Annual Report, 1974-75, Department Of Agriculture, Western Australia
Journal of the Department of Agriculture, Western Australia, Series 4
The Department of Agriculture's Annual Report for the year ended June 30, 1975, took the form of short reviews of selected activities of the Department during the year.
Some of these reviews are reprinted below to give an idea of the range of activities undertaken by the Department. A limited number of copies of the full report are available to interested organisations from the Department of Agriculture, Jarrah Road, South Perth, 6151.
In past years the Department's report has taken the form of a relatively detailed technical summary of the work of each Division. Because of the large volume of …
Virus Diseases In Agriculture, George Mclean
Virus Diseases In Agriculture, George Mclean
Journal of the Department of Agriculture, Western Australia, Series 4
Viruses are extremely small particles which can only be seen with an electron microscope. A virus is present in a diseased plant as huge numbers of tiny particles within the cells of the plant. Viruses which are infectious can cause disease, and reproduce only inside the cells of a living plant.
Many insects transmit plant virus diseases—aphids, leafhoppers, mealy bugs, thrips and beetles. Generally a virus is spread by only one of these groups of insects.
The Western Australian Department of Agriculture is expanding the diagnostic service for the identification of plant viruses.