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NEW NATURALIST NO 85: PLANT DISEASE - A…Many plant diseases have had surprisingly far-reaching social & economic effects perhaps the most poignant example being the Irish potato famine in the mid 1800s. At the time over 1.5 million people died from starvation & disease & a further million emigrated to avoid the despair brought on by a succession of disastrous harvests. This important new book looks at the causes of plant diseases & investigates the mechanisms of pathogenicity & disease resistance in plants. The authors draw on personal field & laboratory observations & discuss all types of infection together with their symptoms & causes. Colour & b/w photographs figures 287pp 1999Hardback £34.99 Info