Change search
ReferencesLink to record
Permanent link

Direct link
Undersökning av några svenska päronsorters känslighet mot päronpest
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Sustainable development
The essay/thesis is partially on sustainable development according to the University's criteria
Alternative title
The susceptibility of some Swedish pear cultivars to fire blight: an experimental test. (English)
Abstract [en]

Fire blight, caused by Erwinia amylovora, is a serious disease, which attacks plants within the family of Rosaceae. This bacterial disease causes major problems in the cultivation of pears (Pyrus communis) around the world. The occurrence of the disease is still geographically limited to certain areas in Sweden and neighbouring countries. However, increasing temperatures due to climate change and the relative unawareness of the public, augment the risk of its spread. Within the EU, there are no approved antibiotics for use in pear orchards. Within the species of P. communis, cultivars vary in their susceptibility to fire blight. Many scientists believe that new, resistant cultivars and rootstocks are important tools to enable pome fruit cultivation in the future.In this study,the susceptibility of some Swedish pear heirloom cultivars to E. amylovora was investigated by using immature pear fruit. The bacteria were introduced into immature pear fruit by using defined concentrations of inoculum. The fruit were incubated at 25°C, and disease severity was recorded over time. Disease was measured and recorded as the extent of lateral lesion size on the surfaces of the pear fruit. No definite differences in disease development were recorded across the concentrations tested. The cultivars were compared to one another, and ranked according to susceptibility. The most susceptible to the least susceptible were: `Sollerö´ > `Unknown Gävle´ = `Esperens herre´ = `Aspa´ > `Höstbergamott´ > `Göteborgs Diamant´ > `Conference´ = `Lilla dalpilen´ = `Carola´ > `Alexander Lukas´ = `Blodpäron´ = `Bonne Louise´. The results could have become clearer if immature fruit of younger physiological age had been used. Nevertheless, the ranking of some cultivars agrees with the published results of others.

Place, publisher, year, edition, pages
2015. , 33 p.
Keyword [en]
Fire blight, Erwinia amylovora, Pyrus communis, immature pear fruit test, heirloom cultivars.
Keyword [sv]
Päronpest, Erwinia amylovora, Pyrus communis, immature pear fruit test, äldre päronsorter.
National Category
URN: urn:nbn:se:hig:diva-20888OAI: diva2:883002
Subject / course
Educational program
2015-12-03, Finska himlen, Wij Trädgårdar, Ockelbo, 11:30 (Swedish)
Available from: 2015-12-21 Created: 2015-12-16 Last updated: 2015-12-21Bibliographically approved

Open Access in DiVA

fulltext(1504 kB)43 downloads
File information
File name FULLTEXT01.pdfFile size 1504 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Electronics, Mathematics and Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 43 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 46 hits
ReferencesLink to record
Permanent link

Direct link