School of Agriculture, Food and Ecosystem Sciences - Theses
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ItemA new virus disease of carrots : its transmission, host range, and control( 1948)During 1940 commercial vegetable growers in the Melbourne market garden area requested an investigation of a disease of spring sown carrots, which had been occurring over a number of years. Summer sowings were not affected, but the failure, or partial failure, of spring sowings had made the production of this crop uneconomic, and as a result, the continuity of carrot supplies to the Melbourne market had been disrupted. The principal objects of the investigation described in this paper have been the elucidation of the factors responsible for the disease, and the development of practical disease control measures. A preliminary report of the investigation, which commenced in 1941, has been published elsewhere (Stubbs & Grieve, 1944).
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ItemThe codling moth in Williams pears : a report of an investigation into the problem in the Goulburn Valley, 1936-19( 1944)The codling moth (Cydia pomonella,L.) is the most serious pest of pears in the Goulburn Valley irrigation area. In the Shepparton, Kyabram, and Ardmona districts, there are approximately 3500 acres of Williams Pon Chretien pears grown principally for canning purposes. For some years past, the losses of pears due to the codling moth have been considerable. In 1936 it was estimated, by executives of the Northern Victoria Fruitgrowers' Association, that codling moth losses accounted for as much as 20% of the total pear crop from the area, that is, a loss of at least �20,000 per annum was being experienced by the industry. No investigation of the codling moth had ever been conducted in the Goulburn Valley; and, although a considerable amount of research had been done elsewhere on the control of the pest in apples, little information was available on combatting the codling moth in pears. Ward (1936) conducted a survey of the pear-growing districts of the Goulburn Valley and found that there was a complete lack of uniformity among growers as to the control measures being used against the codling moth. Having no precise information on the seasonal activity of the pest, growers were not In a position to apply their sprays at the correct time, nor was there an efficient spray schedule in general use. In response to a request from the Northern Victoria Fruitgrowers' Association, and with funds made available from a Commonwealth grant for research and advisory work in relation to the apple and pear industry, an investigation of the problem of codling moth in 'NEC pears was commenced in 1936 by the Victorian Department of Agriculture. For the first two years of the investigation, portion of the Oriental Peach Moth Laboratory at the Ardmona Cannery was kindly made available by the Council for Scientific and Industrial Research, and so facilitated a study of the bionomics of the codling moth under Goulburn Valley conditions.
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ItemAn investigation of potato gangrene in Victoria : including the identification and comprehensive study of the causal organism, Phoma foveata Foister and a comparison of the Scottish and Victorian isolates with P. eupyrena Sacc., P. solanicola Prill et Del. and Phomopsis tuberivora Guss et Fost( 1957?)In October 1963 attention was drawn to the possibility of an hitherto unknown storage disease of potatoes in Victoria. Diseased tubers if the variety ton ware brought to the Plant Research Laboratory, Burnley, from a property at Clarke's Hill, via Ballarat, and a pycnidial-forming fungus was isolated consistently from lesions by Anderson (1953). Later that month, apparently identical isolates were obtained from diseased tubers of two other varieties which were received from the same property. In consequence, an investigation of dry rots in storage was commenced in September, 1954. One of the original objectives was to determine whether this pycnidial-forming fungus was a causal organism of tuber rot. As the investigation proceeded, it became evident that the fungus in question was responsible for a particular type of rot. In other countries similar types of tuber disease have been attributed to species of the Phomaceae. In the detailed study that followed, attempts were made to identify Victorian isolates with, or to distinguish them from, some of these other storage pathogens. As a result of the investigation, the pycnidial forming fungus has been identified as Phoma foveats Foister.. This fungus is responsible for the disease known as Gangrene of tubers in the British Isles. It has not been recorded previously outside that area. Although most of the work described in this report is laboratory in nature, one of the main aims has been to collect information which may may assist in determining an approach to the control of the disease.