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Red ring rot is common in North America. The pathogen Porodaedalea pini is widely spread in the temperate zone in the Northern Hemisphere. [4] It infects a wide range of coniferous trees, including jack pine, lodgepole pine, Sitka and white spruce, Douglas-fir, balsam and true fir, western hemlock, and tamarack.
These lesions first appear as small purple spots which turn red to brown and then black. Most spots are circular but can amalgamate to form large, irregular dead patches. [6] These spots tend to enlarge and separate from healthy tissue. Lastly, they drop out of the leaf giving a "shot-hole" appearance.
California red scale (order Hemiptera: family Coccoidea) Aonidiella aurantii – A hard scale, orange to orange pink, the female covering being less than 1.5 mm across. Often in plague numbers this scale infests upper surfaces of foliage causing yellowing, leaf fall, and twig and branch dieback .
Wood decay caused by Serpula lacrymans (called true dry rot, a type of brown-rot). Fomes fomentarius is a stem decay plant pathogen Dry rot and water damage. A wood-decay or xylophagous fungus is any species of fungus that digests moist wood, causing it to rot.
Shot hole disease is a major concern of the stone fruit industry. It is estimated that 80% of the California almond crop may be infested with shot hole disease, resulting in a potential yield loss of 50-75%. [3] In the 1930s, it was found that applications of Bordeaux mixture reduces shot hole disease on peaches from 80% to 9%.
“There’s only really like half a dozen colors that stand out on the tree—bright colors like blue, red, yellow, and orange,” says Fisher. “We’ve reused those colors over and over.
The bracket fungus Fistulina hepatica is one of many that cause heart rot.. Heart rot is caused by fungi entering the trunk of the tree through wounds in the bark.These wounds are areas of the tree where bare wood is exposed and usually, a result of improper pruning, fire damage, dead branches, insects, or even animal damage.
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