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infected plants , such as geraniums , may be masked at high temperatures . ... two virus strains , chemically distinct , may produce indistinguishable symptoms in one orchid plant but strikingly different symptoms in another .
Over 100 species are known to cause human and animal diseases ; however , the almost 200 species that cause plant disease infect over 150 different genera of higher plants in more than 50 families . Bacterial diseases can be grouped ...
cultivated plants were made by the Soviet biogeographer N.I. Vavilov . His works , coupled with later archaeological findings , indicate the main areas of domestication and the formation of primary plant - breeding cultures .
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review