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Plant PathologyArt and Science
ELEMENTS OF DISEASE
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agriculture apple scab application atmosphere bacteria biological cell wall chemicals chestnut blight complex compounds control measures crop cultural damage depends disease control Dutch elm disease economic effect environment environmental enzymes epidemic established example factors favorable field fruit fungi fungicides fungus genetic germination given grower growth haustoria highly host and pathogen host plant host tissue host-pathogen interaction hyphae important increase infection inoculated inoculum instances invasion involved late blight leaf least lesions less levels light loss materials matter mechanisms moisture move movement nematodes nutrients parasites pathogen pathogenic organisms pathologists pesticides phloem photosynthesis phytoalexin Phytopathology plant disease plant pathology population potato practical problem produce quarantine question recognized reduce resistant varieties responsible result rust season seed seedlings situation soil species spores spray stem substances substantial successful surface susceptible symptoms techniques temperature tion toxic trees ture vector virus viruses weather wheat wilt zoospores