Ash dieback survey

Details are given of the results of a survey of ash dieback carried out in the east-central region of England, from Humberside southward to Buckinghamshire. Ash dieback was prevalent throughout the area, the incidence of the disease being highest in Northamptonshire and adjacent areas in neighbouring counties, where the occurrence of dieback on ash trees over 25 ft in height was frequently over 40%. General observations made during the main survey, and the results of two other special surveys, indicated cl early that the incidence of ash dieback is related to the intensity of agricultural activity, particularly in areas of arable farming. The incidence of ash dieback recorded in the two special surveys was approximately eight times higher on trees in the agricultural countryside as compared with those in towns and villages.</p

Ash dieback survey

Details are given of the results of a survey of ash dieback carried out in the east-central region of England, from Humberside southward to Buckinghamshire. Ash dieback was prevalent throughout the area, the incidence of the disease being highest in Northamptonshire and adjacent areas in neighbouring counties, where the occurrence of dieback on ash trees over 25 ft in height was frequently over 40%. General observations made during the main survey, and the results of two other special surveys, indicated cl early that the incidence of ash dieback is related to the intensity of agricultural activity, particularly in areas of arable farming. The incidence of ash dieback recorded in the two special surveys was approximately eight times higher on trees in the agricultural countryside as compared with those in towns and villages.</p

Ash dieback survey

5.85SIGLELD:3128.503(CFI-OP--24) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Root disturbance of common ash, Fraxinus excelsior (Oleaceae), leads to reduced foliar toughness and increased feeding by a folivorous weevil, Stereonychus fraxini (Coleoptera, Curculionidae)

1Bioassays were carried out to examine differences in the feeding of a folivorous weevil, Stereonychus fraxini De Geer, on leaves from ash saplings with undamaged roots, and those with damaged roots. Beetles ate significantly more of the leaves of root-damaged saplings in a choice experiment.2A separate study of the effect of root damage on leaf toughness was carried out on a second group of ash saplings. Saplings with damaged roots had less tough leaves than control saplings. Decreased leaf toughness in hypothesized as a mechanism to explain the preference of weevils for leaves from damaged trees.3Both chemical and physical changes may occur in the tissues of ash trees in response to environmental stress such as drought and root damage.4Root damage caused by agricultural disturbance is hypothesized as a mechanism making mature ash trees in hedgerow ecosystems more susceptible to insect herbivores.FLWNAinfo:eu-repo/semantics/publishe