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6 Wood Discoloration

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8.1 Fungal Damage to Living Trees 163<br />

Table 8.2. Some fungal damages to buds, shoots, and branches (compiled from Butin 1995)<br />

Disease Causal fungus Classification<br />

Cucurbitaria bud blight of spruce Gemmamyces piceae (Borthw.) Cassagrande Dothideales (A)<br />

Grey mold Botryotinia fuckeliana (de Bary) Whetzel Helotiales (A)<br />

Sphaeropsis shoot-killing of pine Sphaeropsis sapinea (Fr.) Dyko & Sutton Coelomycetes (D)<br />

Pine twisting rust Melampsora pinitorqua E. Rostrup Uredinales (B)<br />

Brunchorstia dieback of conifers Gremmeniella abietina (Lagerb.) Morelet Coelomycetes (D)<br />

Shoot shedding of pine Cenangium ferruginosum Fr. Helotiales (A)<br />

Juniper rust Gymnosporangium sabinae (Dickson) Winter Uredinales (B)<br />

Kabatina shoot killing Kabatina thujae Schneider & Arx Coelomycetes (D)<br />

of Cupressaceae<br />

Pollaccia shoot blight of poplar Venturia macularis (Fr.) E. Müller & Arx Dothideales (A)<br />

Myxosporium twig blight of birch Myxosporium devastans E. Rostrup Coelomycetes (D)<br />

Marssonina leaf and shoot blight Drepanopeziza sphaerioides (Pers.) Höhn. Helotiales (A)<br />

of willow<br />

A ascomycete, B basidiomycete, D deuteromycete<br />

Beech seedling disease is due to Phytophthora cactorum. OtherPhytophthora<br />

species attack chestnuts. Rosellinia quercina, Cylindrocarpon destructans and<br />

Fusarium oxysporum lead to root damage in young oaks.<br />

Forest canopy fungi were investigated by Stone et al. (1996). A total of 344<br />

different morphotaxa of endophytic fungi were isolated from leaves of Theobromae<br />

cacao. Most common were Colletotrichum sp., Xylaria sp. and Nectria<br />

sp. Inoculation of sterile leaves of young cocoa trees with these endophytes<br />

reduced subsequent damage by a parasitic Phytophthora sp. (Kull 2004).<br />

Many species of fungi are capable of causing leaf diseases. Hardwood leaf<br />

diseases showing superficial fungal growth, or swollen, raised, or dead leaf areas,<br />

may be grouped simplistically into leaf spot, blotch, anthracnose, powdery<br />

mildew, leaf-blister, and shot-hole. Conifers may show needle spot, cast, blight,<br />

and rust (Tattar 1978; Stephan 1981; Butin and Kowalski 1989; Stephan et al.<br />

1991). Table 8.1 only lists some fungi causing leaf diseases. Details on a specific<br />

disease may be read in Butin (1995).<br />

Some fungal damages to buds, shoots, and branches are listed in Table 8.2.<br />

8.1.1<br />

Bark Diseases<br />

Some bark diseases caused by fungi are listed in Table 8.3.<br />

Three bark diseases are described in detail.<br />

8.1.1.1<br />

Beech Bark Disease<br />

Beech bark disease (Fig. 8.1) has been known in Europe since about 1849<br />

and was imported to North America (Shigo 1964; Parker 1974; Schütt and<br />

www.taq.ir

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