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Cypress canker is a disease affecting Cupressus species, caused by one of several species of fungus in the genus Seiridium. Infection causes die-back of twigs and branches in susceptible cypress trees, [ 1 ] with rapidly increasing amounts of damage and the death of the tree.
On the other hand, no sexual stage of species Seiridium cardinale is known, so that is its only name. [ 2 ] [ 3 ] Seiridium cardinale is important to gardeners and foresters as they cause the devastating Cypress canker disease on Cupressus , Thuja , and related conifers in Northern Europe, America, Australia, [ 4 ] and New Zealand.
The vast majority of the trees in cultivation are selected cultivars with a fastigiate crown, with erect branches forming a narrow to very narrow crown often less than a tenth as wide as the tree is tall. The dark green "exclamation mark" shape of these trees is a highly characteristic signature of Mediterranean town and village landscapes.
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Chamaecyparis and Thuja also provide hundreds of dwarf cultivars as well as trees, including Lawson's cypress. Dawn redwood is widely planted as an ornamental tree because of its excellent horticultural qualities, rapid growth and status as a living fossil . [ 26 ]
Olive quick decline syndrome (OQDS) (in Italian: Complesso del Disseccamento Rapido dell'Olivo, CDRO or CoDiRo) is a wasting disease of olive trees which causes dieback of the leaves, twigs and branches so that the trees no longer produce crops of olives.
The most frequent symptoms of disease caused by P. lateralis are root and collar lesions. Trees become infected by their roots coming into contact with the zoospores in the soil or water. Hyphae then develop in larger roots and into the root collar where they kill the inner bark . [ 5 ]
General Sherman appears to be holding up well (not bad for a 2,200-year-old), but because of pests and climate change, the largest tree in the world needs a checkup