4 pp. / Cotton root rot commonly causes a sudden wilt and death of susceptible plants in summer months but may also cause a slow decline, especially at cooler temperatures. So, positive identification of disease by an experienced person is essential. This publication addresses the symptoms, environmental conditions, disease, prevention and control methods, sampling, identifying susceptible plants and the tolerant and immune plants of cotton root rot.

26 pp. / Geographically, Arizona can be divided roughly into four areas, southwest, central, southeast, and northern. These regions correspond with four climatic zones, allowing a large and diverse number of plants to be grown for landscaping purposes. But, interestingly, in this desert environment many of the parasitic diseases in landscape plants are caused by a limited number of plant pathogens. This publication discusses some of those diseases that are sufficiently important to the urban plants in all areas Arizona.

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A dissertation submitted in partial compliance with the requirements for the Masters Degree in Technology: Homoeopathy, Technikon Natal, 1997. / Most economically important crop plants may become infected with viruses. Several of these virus diseases are limiting factors in agricultural production and have contributed to serious economic and social hardship in many countries, especially in tropical and subtropical regions. Homoeopathic microdoses have been investigated for their role in the control of virus diseases, with good results. However, few of the studies contain statistical analyses. The object of this study was to assess the effect of a homoeopathic preparation of a leaf infected with tobacco mosaic virus (TM Viricum) in the contol of tobacco mosaic virus (TMV). The potencies used were 6CH, 12CH, 30CH and 200CH. iv Trays of 24 tomato seedlings per tray were the subjects of this study. Tomato plants were systemically infected with TMV. Four trays were used per treatment. There was an uninoculated and an inoculated control group. The rest of the test population was divided into two groups. The / M

A Thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg for the Degree of Doctor of Philosophy / Greening is a severe disease of citrus and is a major cause of crop loss in many parts of Africa and Asia.Numerous attempts have been made by various workers to isolate the aetiological agent of the disease and although reports claiming the successful culture of the organism have appeared, the isolations were never fully confirmed. ( Abbreviation abstract ) / AC2017