Hanne Vermeulen

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Isolaten vanColletotrichum uit Zuid-en Middenamerikaanse koffiebessen werden vergeleken op hun vermogen om onder laboratorium-en kasomstandigheden in Nederland koffiebesziektesymptomen te veroorzaken. Géén van de 59 Amerikaanse isolaten bleek pathogeen te zijn. De koffiebesziekte lijkt daarom niet voor te komen op het westelijk halfrond. Perithecia(More)
The presence of the flagellatePhytomonas leptovasorum, Stahel in the phloem vessels ofCoffea liberica Bull. ex Hiern., suffering from phloem necrosis, was once more demonstrated. The association of the organism with the multiple division of sieve tubes in affected trees was confirmed. The different nature of a wilting disease caused by the(More)
Door middel van meristeemcultures werd getracht virusvrije planten te verkrijgen van vijf Freesia-variëteiten. Hiertoe werden meristemen uitgeprepareerd en op verschillende voedingsbodems geplaatst (Fig. 1). Op één medium ontwikkelde zich een aantal meristemen tot normale planten, op de andere media vertoonden de cultures soms een overmatige(More)
In earlier experiments the perfect state,Glomerella cingulata, had been found associated withColletotrichum coffeanum. As the linkage betweenG. cingulata and the coffee berry disease (CBD) pathogen had still been doubtful, further investigations were done. It was found that mono-spore cultures derived fromG. cingulata perithecia from two different CBD(More)
Several species ofColletotrichum occur in maturing bark ofCoffea arabica branches in Kenya. TheColletotrichum population inhabits the bark tissue external to the developing phellogens in the cortex. TheColletotrichum species are unable to invade green bark tissue, where the phellogen has not yet been differentiated, while colonization ceases on the(More)
Recently VaN OS (1964) gave a detailed description of the meristem culture technique (QuAK, 1957, 1961) applied to carnations. This work is now being carried out on a large scale by the Plant Protection Service at Wageningen for the PrOduction of carnations free from carnation mottle virus and carnation ringspot virus. In his paper VAN Os summarises(More)
s from the 11th Symposium on Experimental Rhinology and Immunology of the Nose (SERIN 2017) Düsseldorf, Germany. 30 March–01 April 2017 Published: 23 August 2017 © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits(More)
On the maturing bark of cut branches ofCoffea arabica previously sprayed with copper fungicides perithecia ofGlomerella cingulata were easily found after two to ten days of incubation. Without fungicides the number of perithecia was decidedly lower. On prunings left on the ground under the coffee trees for 6 to 24 weeks the perithecia could also be found,(More)
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