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New considerations for pruning in management of fire blight in pears
Year:
2003
Source of publication :
Plant Disease
Authors :
Kritzman, Giora
;
.
Shtienberg, Dan
;
.
Volume :
87
Co-Authors:
Shtienberg, D., Department of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Zilberstaine, M., Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Oppenheim, D., Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Levi, S., G.O.F.R. Central, Hadera, Israel
Shwartz, H., Department of Plant Pathology, ARO, Bet Dagan, Israel
Kritzman, G., Department of Plant Pathology, ARO, Bet Dagan, Israel
Facilitators :
From page:
1083
To page:
1088
(
Total pages:
6
)
Abstract:
The efficacy of pruning infected pear tissues to combat fire blight (caused by Erwinia amylovora) was evaluated in two sets of experiments conducted during 1999 to 2001 in Israel. In the first set of two experiments, diseased tissues were removed soon after the observation of blossom infections. Pruning was effective in 0 to 50% of the treated trees, and resulted in complete eradication of E. amylovora. In the remaining trees, pruning not only did not result in eradication of the bacteria from the tree tissues, it made the situation worse, as the disease had invaded the main branches and limbs of a significantly larger proportion of pruned trees than of non-pruned ones, because of alteration of the physiological status of the host plant by pruning. In the five experiments of the second set, the efficacy of pruning fire blight infections on main branches and limbs was studied; the time of pruning varied among the experiments. Effectiveness of cutting and removing infected branches and limbs was linearly related to time of treatment: the efficacy of pruning improved significantly with lateness of the treatment. The best results were obtained when pruning was carried out while the trees were dormant, in December: none of these trees had a severely infected canopy the following spring. Based on the results obtained in this study, it was concluded that factors related to all three components of the disease triangle (i.e., pathogen, host, and environment), rather than only the actual presence of diseased tissues, should be taken into account in considering the need for cutting and removing fire blight-diseased tissues. Accordingly, recommendations for Israeli growers were revised and updated.
Note:
Related Files :
bacteria
Erwinia amylovora
physiology
Plants (botany)
pruning
Pyrus
Pyrus communis
tissue culture
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31073
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
You may also be interested in
Scientific Publication
New considerations for pruning in management of fire blight in pears
87
Shtienberg, D., Department of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel
Zilberstaine, M., Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Oppenheim, D., Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Levi, S., G.O.F.R. Central, Hadera, Israel
Shwartz, H., Department of Plant Pathology, ARO, Bet Dagan, Israel
Kritzman, G., Department of Plant Pathology, ARO, Bet Dagan, Israel
New considerations for pruning in management of fire blight in pears
The efficacy of pruning infected pear tissues to combat fire blight (caused by Erwinia amylovora) was evaluated in two sets of experiments conducted during 1999 to 2001 in Israel. In the first set of two experiments, diseased tissues were removed soon after the observation of blossom infections. Pruning was effective in 0 to 50% of the treated trees, and resulted in complete eradication of E. amylovora. In the remaining trees, pruning not only did not result in eradication of the bacteria from the tree tissues, it made the situation worse, as the disease had invaded the main branches and limbs of a significantly larger proportion of pruned trees than of non-pruned ones, because of alteration of the physiological status of the host plant by pruning. In the five experiments of the second set, the efficacy of pruning fire blight infections on main branches and limbs was studied; the time of pruning varied among the experiments. Effectiveness of cutting and removing infected branches and limbs was linearly related to time of treatment: the efficacy of pruning improved significantly with lateness of the treatment. The best results were obtained when pruning was carried out while the trees were dormant, in December: none of these trees had a severely infected canopy the following spring. Based on the results obtained in this study, it was concluded that factors related to all three components of the disease triangle (i.e., pathogen, host, and environment), rather than only the actual presence of diseased tissues, should be taken into account in considering the need for cutting and removing fire blight-diseased tissues. Accordingly, recommendations for Israeli growers were revised and updated.
Scientific Publication
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