Plant Diseases: Epidemics and ControlThe control of plant diseases studied as part of epidemiology. About interest on money, logarithmic increase. The logarithmic and the apparent infection rates. How to plot the progress of an epidemic. The basic infection rate. The latent period. Average values of infection rates; increase of populations of lesions and foci, independente action of propagules. Corrected infection rates. Stochastic methods in epidemiology. A guide to the chapters on control of disease. Sanitation with special reference to potato bligth. Sanitation with special reference to wheat stem rust. Sanitation and two systemic diseases, sanitation when other things are not equal. Vertical and horizontal resistance against potato bligth. A note on the history of stem rust epidemics in spring wheat in North America. Plant disease in biological warfare. The bases of vertical resistance. General resistance against disease. The choice of type of resistance. The quantitative effect of horizontal resistance. Control of disease by fungicides. How disease spreads as it increases. The cryptic error in field experiments. |
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amount of disease Aroostook County attack average barberry eradication blight epidemic bunt bushels calculated Chapter compound interest crop destroyed discussed effect epidemic equation estimate example experimental experiments factor favorable field resistance Figure foci foliage fungicide fungus fusarium wilt gene R1 healthy horizontal resistance host increase of disease infected tissue initial inoculum inoculation interest disease July Kennebec latent period leaf lesions logarithmic phase logarithmic stage loge loss of yield multiple infections number of spores pathogen percentage Phytophthora infestans plants potato blight potato variety progress curve Puccinia graminis pustules races reduces relative infection rate resistant varieties rust fungus sanitation ratio season Section seed shows simple interest sporangia spores sprayed plots spread Stakman stripe rust susceptible varieties t₁ and t2 Table tomato trees tubers unit per day unsprayed uredospores vertical resistance Vertifolia virus Voran weather wheat stem rust xt-p