Wheat Diseases and Pests - Wheat Doctor - CIMMYT
Wheat Diseases and Pests - Wheat Doctor - CIMMYT
Wheat Diseases and Pests - Wheat Doctor - CIMMYT
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Bacterial <strong>Diseases</strong><br />
Bacterial plant pathogens are small unicellular rods .<br />
from 1 to 3 p m in length. They do not have a<br />
well-defined nucleus, nor a nuclear membrane.<br />
Bacteria are spread by insects, air currents,<br />
splashing rain, <strong>and</strong> by mechanical means. Free<br />
moisture usually is necessary for infection, <strong>and</strong><br />
penetration of host tissue occurs through wounds<br />
or stomata1 openings. These pathogens invade the<br />
vascular system or intercellular spaces in host<br />
tissue, <strong>and</strong> necrosis results from toxins produced<br />
or enzymatic activity of the bacteria.
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