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Pathological pruning, in which all lower branches are pruned regardless of signs or symptoms of infection, may reduce disease instance in white pine tree stands. [ 14 ] Furthermore, genetic hybridization testing has been conducted for more than half a century in order to find resistance among strains of the species, and have since successfully ...
Porodaedalea pini, commonly known as the pine conk, [1] is a species of fungus in the family Hymenochaetaceae. It is a plant pathogen that causes tree disease commonly known as "red ring rot" or "white speck". This disease, extremely common in the conifers of North America, decays tree trunks, rendering them useless for lumber. [2]
Fusarium circinatum is a fungal plant pathogen that causes the serious disease pitch canker on pine trees and Douglas firs (Pseudotsuga menziesii).The most common hosts of the pathogen include slash pine (Pinus elliottii), loblolly pine (Pinus taeda), Monterey pine (Pinus radiata), Mexican weeping pine (Pinus patula), and Douglas fir. [1]
The disease can infect trees as young as 6 years-old, and infects trees throughout their lifespan. [2] Diagnostic symptoms include crown yellowing and thinning, a distress crop of cones, red brown stained outer heartwood, and laminate decay (decay that separates along annual rings).
Pine-pine gall rust, also known as western gall rust, is a fungal disease of pine trees. It is caused by Endocronartium harknessii (asexual name is Peridermium harknessii ), an autoecious , endocyclic , rust fungus that grows in the vascular cambium of the host. [ 1 ]
The symptoms give the disease its name. The first signs of infection that can be seen are yellow and brown spots that develop on the living needles, [ 7 ] [ 8 ] which soon turn red. This infection starts on the base of the crown on older needles, which then turn a brownish red at the tip, while the rest of the needle remains green. [ 9 ]
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It has been introduced into Japan and China, [10] where it has become a troubling disease of Japanese red pines (Pinus densiflora) and black pines (Pinus thunbergii). Over 46 million cubic meters of trees have been lost alone in Japan over a 50-year period. [10] It is spread among conifers by pine sawyer beetles (Monochamus spp). The nematodes ...