| population structure of geosmithia morbida, the causal agent of thousand cankers disease of walnut trees in the united states. | the ascomycete geosmithia morbida and the walnut twig beetle pityophthorus juglandis are associated with thousand cankers disease of juglans (walnut) and pterocarya (wingnut). the disease was first reported in the western united states (usa) on several juglans species, but has been found more recently in the eastern usa in the native range of the highly susceptible juglans nigra. we performed a comprehensive population genetic study of 209 g. morbida isolates collected from juglans and pterocary ... | 2014 | 25393300 |
| a novel molecular toolkit for rapid detection of the pathogen and primary vector of thousand cankers disease. | thousand cankers disease (tcd) of juglans and pterocarya (juglandaceae) involves a fungal pathogen, geosmithia morbida, and a primary insect vector, pityophthorus juglandis. tcd was described originally from dying juglans nigra trees in the western united states (usa), but it was reported subsequently from the eastern usa and northern italy. the disease is often difficult to diagnose due to the absence of symptoms or signs on the bark surface of the host. furthermore, disease symptoms can be con ... | 2018 | 29304036 |
| cold tolerance of pityophthorus juglandis (coleoptera: scolytidae) from northern california. | winter survivorship of insects is determined by a combination of physiological, behavioral, and microhabitat characteristics. we characterized the cold tolerance of the walnut twig beetle, pityophthorus juglandis blackman, a domestic alien invasive bark beetle that vectors a phytopathogenic fungus. the beetle and fungus cause thousand cankers disease in species of juglans and pterocarya. the disease is spreading in the united states of america (usa) and italy. contact thermocouple thermometry wa ... | 2017 | 28510721 |