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Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot. [1] [2] It affects members of the Prunus genus such as; cherry, plum, apricot, and chokecherry trees in North America. The disease produces rough, black growths that encircle and kill the infested parts, and provide habitat for insects.
A. morbosa Apiosporina is a genus of fungi in the family Venturiaceae . [ 1 ] Seeds of the Chinese elm , Trident maple and Japanese black pine can be infected with Apiosporina collinsii to produce dwarf forms used to make bonsai trees.
Apiosporina morbosa is a major fungal disease in the Northern Americas, with many urban centres running black knot fungus management programs. [32] This disease is best managed by physical removal of knot-bearing branches to prevent spore spread and immediate disposal of infected tissue. [32]
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Polygonum paronychia is a species of flowering plant in the knotweed family known by the common names dune knotweed, black knotweed, and beach knotweed. [1] It is native to the coastline of western North America from British Columbia to California , where it grows in sandy coastal habitat such as beaches, dunes, and scrub.
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The action of P. nicotianae is amplified by the presence of root-knot nematodes, which through their own feeding habits, assist the pathogen in finding an entrance to the host. This pathogen synergy with root-knot nematodes has the ability to overcome much of the resistance of cultivars especially bred for P. nicotianae resistance. [6]
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