By Friðjónsson, Jón
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The longleaf pine atmosphere, as soon as some of the most large ecosystems in North the US, is now one of the so much threatened. during the last few centuries, land clearing, logging, fireplace suppression, and the encroachment of extra competitive vegetation have resulted in an overpowering reduce within the ecosystem’s dimension, to nearly 2.
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Schemati c mode lo f epidemi c structure sfo r monocycli c (top ) an d poly cyclic disease s (bottom) . Th e term s mono - an d polycycli c indicat e tha tth e pathoge produceson eo r mor e generation s durin g th e vegetatio n perio do fth ehost . Eac epidemic structur econsist so fthre e subsystem s represente d b y rectangula r b o x e s host, disease , an dpathogens—a swel l a so f element s represente d b y squar e boxes Environmental ( E ) an d huma ninterferenc e factor s ( H ) ar eshow n a scircles .
W. , with inoculum from the same host species. Apart from hetero- and homogeneous infection chains (Gaumann, 1951) 44 J . KRAN Z T A B L EI I Comparisono f th e Structura l Element so f Thre e Host-Pathoge n System sa Structural element Survivalo n Infectiono n Sporulation on Monilinia laxa on almon d Blighted blossoms , twigs, mummie s and peduncle so f previous yea r Blossoms; monocycli c and homogeneou s (sometimes als o fruits) Blighted blossoms , twigs, (fruits ) an d mummies,recurren t Sphaerotheca pannosao n plum Pseudoperonospora hamulio n ho p Dormant bud s an d newshoot so f roses Dormant ho pcrown s and bud s Shoots (incl .
Sci. C . G . (1975) . Th efire brigad e stop sa ragin gcor n epidemic . S. , Dep. Agric, Yearbook pp . 105-114 . Large, E . C . (1940) . "Th e Advanc eo fth e Fungi. Hol t& Co. , Ne wYork . Y . ( 1 9 7 3 ) . Th e grea t Benga l famine . Annu. Rev. Phytopathol. 11 , 11-26. Smith, E . F . ( 1 8 8 8 ) . Peac h yellows . S. , Dep. Agric, Bot. Div. Bull. 9 , 1-254 . Woodham-Smith, C . ( 1 9 5 3 ) . "Th e Reaso n Why. " McGraw-Hill , Ne wYork . Woodham-Smith, C . (1962) . "Th e Grea t Hunger , Irelan d 1845-1849.