A method of using the proportions of undamaged carrots or parsnips to estimate the relative population densities of carrot fly (Psila rosae) larvae, and its practical applications

Abstract A new distribution map is provided for Psila rosae (Fabricius). Diptera: Psilidae (carrot fly, carrot rust fly). Attacks carrot, parsnip, celery. Information is given on the geographical distribution in Europe, Austria, Belgium, Czechoslovakia, Denmark, Finland, France, Germany, Hungary, Ireland, Italy, Netherlands, Norway, Poland, Spain, Sweden, Switzerland, Turkey, United Kingdom, CIS (former USSR), European CIS, Georgia, Latvia, Leningrad area, Russia, Amur region, Khabarovsk, Primorsk, Sakhalin, Ukraine, Asia, Mongolia, Australasia, New Zealand, North America, Canada, Alberta, British Columbia, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward Island, Quebec, USA, California, Connecticut, Maine, Massachusetts, Michigan, New Hampshire, New York, Ohio, Oregon, Pennsylvania, Washington.

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Resource Allocation Modelling for Home-Based Health and Social Care Services in Areas Having Differential Population Density Levels: A Case Study in Northern Ireland

Health Services Management Research ◽

10.1177/095148480001300304 ◽

2000 ◽

Vol 13 (3) ◽

pp. 164-169 ◽

Cited By ~ 7

Author(s):

Tony Hindle ◽

Adam Hindle ◽

Martin Spollen

Keyword(s):

Resource Allocation ◽

Northern Ireland ◽

Social Services ◽

Social Care ◽

Geographical Information ◽

Population Densities ◽

Relative Population ◽

Care Services ◽

Home Based ◽

Health And Social Care

This project arose from deliberations within the Department of Health and Social Services (DHSS) in Northern Ireland concerning the acceptability of the revenue resource allocation methodology they were using. One problem with the method being used had been the absence of a component that adequately reflected the relative costs associated with the differential population densities of the four health boards into which the Province is divided. This study investigates a particular element of this issue, viz differences in the travelling distances and times of those health and social service professionals who provide visiting services to patients in their own homes. A modelling approach has been developed and used in conjunction with a comprehensive spatial and geographical information system for Northern Ireland. An important outcome of the study has been estimates of the targets that should be set for the annual health and social care travelling distances and times per head of population in the boards, for a range of home-based services. Also, the project has contributed to decisions made by the DHSS in Northern Ireland concerning the annual financial compensations required by boards for costs associated with their relative population densities.

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The sensory receptors of the carrot fly larva, Psila rosae (F.) (Dipt., Psilidae)

Bulletin of Entomological Research ◽

10.1017/s0007485300005435 ◽

1973 ◽

Vol 62 (4) ◽

pp. 545-548 ◽

Cited By ~ 12

Author(s):

M. F. Ryan ◽

M. Behan

Keyword(s):

Root Hairs ◽

Sensory Receptors ◽

Campaniform Sensilla ◽

Psila Rosae ◽

Basiconic Sensilla ◽

Carrot Fly ◽

Electron Microscopes ◽

Scanning Electron Microscopes ◽

Scanning Electron

Examination of the cephalic lobes of larvae of Psila rosae (F.) by means of light and scanning electron microscopes revealed the presence of 24 sensilla, ten campaniform, eight basiconic, four ampullaceous and two styloconic. By comparison with the known functions of similar sensilla in other insects, it is suggested that the ampullaceous and basiconic sensilla respond to plant emanations in soil, air and water, respectively, and that styloconic sensilla determine the palatability of the root hairs; the role of the campaniform sensilla is obscure.

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Diapause and overwintering of the carrot fly, Psila rosae (F.) (Diptera: Psilidae)

Bulletin of Entomological Research ◽

10.1017/s0007485300010099 ◽

1981 ◽

Vol 71 (4) ◽

pp. 583-590 ◽

Cited By ~ 12

Author(s):

A. J. Burn ◽

T. H. Coaker

Keyword(s):

Adult Emergence ◽

Early Spring ◽

Pupal Weight ◽

Prepupal Stage ◽

Psila Rosae ◽

Carrot Fly ◽

Soil Temperatures ◽

Similar Temperature ◽

Effects Of Temperature ◽

Diapause Development

AbstractPsila rosae (F.) overwinters in Britain in both the larval and pupal stages. Overwintering pupae formed in October and November at soil temperatures of between 10 and 16°C entered diapause. A period of similar temperature in the laboratory during the prepupal stage also caused pupae to enter diapause. Overwintering larvae continued to feed and gain weight; they pupated in early spring at soil temperatures of 2–8°C but did not enter diapause. The sensitivity to diapause-inducing conditions decreased between November and March, associated with changes in developmental temperatures and pupal weight. The differential effects of temperature on larval, pupal and diapause development together serve to synchronise adult emergence from the overwintering population. The mechanisms which allow overwintering by a variable proportion of larvae and pupae also provide the opportunity for the development of a third generation of adult flies in October and November.

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