White pine blister rust on pine
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1 White pine blister rust on pine
2 History of white pine blister rust First recorded in Europe from the Baltic region in 1854 By 1900 it widespread across Europe - rapid spread by forest tree nurseries Introduced into Eastern North America probably by 1898 on nursery stock from Europe, definitively recorded in Geneva New York and seven other states by 1900 Discovered in Vancouver BC in 1921 on Ribes nigra and young exotic pines. - by 1922 it was found widely in BC and the Northern Cascades of Washington state; entire epidemic appears to have originated from a single batch of 1,000 seedling imported from France
3 Control measured tried Elimination of Ribes species Breeding for resistance (vertical and horizontal) Bro Kinloch Forest genetist who has worked on resistance of Sugar pine
4 Distribution of the big R gene in sugar pine
5 Horizontal resistance on a young sugar pine at Happy Camp nursery
6
7 Effect of White pine blister rust (& selective logging) on forest composition in Montana
8 What is the fate of white pines in Western North America Most species will probably not become extinct But they will become much less common and more restricted in habitat Many secondary effect on wildlife and forest health are possible
9 Dutch Elm disease Ophiostoma ulmi Deadly beetle vectored disease of Elm All European and North American Elms are susceptable
10 Lifecycle of Dutch Elm disease
11
12 Lifecycle of Dutch Elm disease
13 Dutch Elm disease effects
14 Dutch Elm disease symptoms on wood
15 Scolytus mutistriatus
16 Ophiostomatales, Ophiostoma Meiotic Ophiostoma state Mitotic graphium state
17 History of Dutch elm disease Appeared in France, Belgium, and Germany between Arrival in Eastern US in late 20s, established in New York and effecting 5500 sq miles by 1940 strain transported to Ohio 1928 via diseased logs New epidemics in Europe, Aggressive strains recognized in Europe 1971 Origin of disease remains unknown to this day!
18 Distribution of aggressive strains in Europe. now known to be a new species, O. nova-ulmi
19 Control measures tried Beetle control through sanitation Chemical control on prize trees Breeding for resistance All of the above have only been applied to city settings; the forest trees are now gone.
20 Disease progress curves for Dutch elm disease in Midwestern and Eastern cities
21 Chestnut blight Cryphonectria parasitica Primary host: Chestnuts Effect: kills above ground portion of trees Spread by wind and by animals
22 Chestnut blight effects
23 Chestnut blight effects
24
25 Cryphonectria Stroma with perithecia and pycnidia
26 Cryphonectria A cirrhus of mitospores or conidia
27 Chestnut blight distribution
28 Control measures tried Breeding for resistance Virus mediated hypovirulence
29 Fungi and Virus Castenia - Cryphonectria - Hypovirulence Virus Nuss and Colleagues, Maryland
30 Pitch Canker Fusarium circinatum Hosts - all pines tested and Douglas-fir Kills branches and ultimately trees May be beetle vectored
31 Pitch Canker - Fusarium circinatum
32
33 Home Ranch site at Pt. Reyes
34 Pitch Canker first seen in California in1986 near Santa Cruz Now found from San Diego to Mendocino Devastating effect on Monterey pine throughout range Also spread to Japan and South Africa Host range known to be much broader Origin of the disease may be Mexico
35 Sudden Oak Death Wide host range Spread by locally via wind, water, soil Probably spread across continents and within California via the nursery industry (Rhododendron movement) Origin of disease still unknown Ultimate impact of disease to be determine
36 Sudden Oak death - Phytophthora ramorum At China camp State park, Marin Co.
37 Other examples Phytophthora cinnamomi Australian forests Phytophthora lateralis on Port Orford Cedar Dogwood Anthracnose - Discula destructiva Butternut canker - Sirococcus clavigignentijuglandacearum Beech bark disease - Eastern NA Puccinia psidii - guava rust
38 Some general rules The problem is clearly international and growing Consequences of introductions can be catastrophic Once an introduction happens little can be done The diseases are often unknown or of minor importance in their native range Scientific names of pathogens are deceiving.
39 What can we do? Educate the public about the dangers of moving plant material and soil International restrictions on the movement of living plants and green logs - this is an uphill battle that will take tremendous political pressure.
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