| 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 |
| allergy epidemiology in the st. louis, missouri, area. iii. trees. | a population skin-tested with pollen from twelve wind pollinated tree species showed a variable level of allergenicity, particularly among adults. pollen extracts of box elder, willow and hickory elicited the highest allergic reactions, oak, birch, sycamore, black walnut and poplar more moderate reactions, while allergens from cottonwood, maple, elm and white ash were less reactive. since box elder is ubiquitous and produces a strongly positive reaction among adults, it should be included among ... | 1975 | 1147318 |
| colonization of artificially stressed black walnut trees by ambrosia beetle, bark beetle, and other weevil species (coleoptera: curculionidae) in indiana and missouri. | thousand cankers disease (tcd) is a new disease of black walnut (juglans nigra l.) in the eastern united states. the disease is caused by the interaction of the aggressive bark beetle pityophthorus juglandis blackman and the canker-forming fungus, geosmithia morbida m. kolarik, e. freeland, c. utley & tisserat, carried by the beetle. other insects also colonize tcd-symptomatic trees and may also carry pathogens. a trap tree survey was conducted in indiana and missouri to characterize the assembl ... | 2015 | 26314028 |