2016 09 Tree Failure in Yuen Long
A tree failure occurred in a park in Yuen Long in September 2016. “white ant s” (termites) were noted at the point of tree failure. This is an example of when subterranean termites such as Coptotermes formosanus attack a tree from below the ground. They usually are not visible from outside the tree – all …
Anoplophora glabripennis
Anoplophora glabripennis, Asia longhorn beetle Host and distribution The most destructive non-native insect attacking US trees in the Asian longhorn beetle Anoplophora glabripennis. As with the closely related Citrus longhorn beetle (A. chinensis), A. glabripennis attacks a wide range of Asian, North American and European tree species (esp. maples, chestnuts, sycamores and poplars). Asian longhorn originated …
Bursaphelenchus xylophilus
Bursaphelenchus xylophilus, pine wood nematode Host and distribution Pine wood nematode B. xylophilus is spread by Monochamus beetles and with the movement of infested live or sawn wood. B. xylophilus can live in the wood of all species of conifers other than Thuja, Tsuga and Taxus although North American pines in the nematodes’ natural distribution …
Candidatus Liberibacter asiaticus
Bacterium, Candidatus Liberibacter asiaticus, citrus greening, also known as huanglongbing Host and distribution Ca. L. asiaticus is a bacterial pathogen originating in Asia that has recently been introduced into the Americas (1). It causes citrus greening, which now presents an unprecedented threat to citrus production worldwide. It is transmitted by the phloem-feeding citrus psyllid insects (Diaphorina …