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Reevaluation of factors affecting bunch drop in date palm
Year:
2010
Source of publication :
HortScience
Authors :
Cohen, Yuval
;
.
Freeman, Stanley
;
.
Soroker, Victoria
;
.
Zveibil, Aida
;
.
Volume :
45
Co-Authors:
Cohen, Y., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Freeman, S., Department of Plant Pathology and Weed Research, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zveibil, A., Department of Plant Pathology and Weed Research, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zvi, R.B., Zemach Regional Agriculture Research Center, Jordan Valley 15132, Israel
Nakache, Y., Eden Experimental Station, Bet Shean Valley, Israel
Biton, S., Israeli Ministry of Agriculture and Rural Development, Extension Service
Soroker, V., Department of Entomology, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
887
To page:
893
(
Total pages:
7
)
Abstract:
Severe damage has been observed in Israeli date palm (Phoenix dactylifera L.) plantations of the Medjool cultivar as a result of drying and dropping of fruit bunches. Both fractures and rot occurred during peduncle (fruit stalk) development at proximal points located deep within the crown. The phenomenon has been previously described as "cross-cut" or "V-cut." The present study aimed to characterize the phenomenon and identify the main causal factors. Annual surveys have revealed high levels of fruit bunch drop in all 'Medjool' cultivation areas in Israel. Arenipses sabella and other insects were only occasionally detected in the damaged fruit stalks. Similar damage levels observed in insecticide-treated and untreated plots suggested that insects were not directly responsible for this phenomenon. Tissue decay was detected in many of the freshly fallen fruit stalks. The pathogenic fungus, Fusarium proliferatum, was detected in most of the necrotic fruit stalks. Fusarium proliferatum isolates from infected fruit stalks generated necrotic lesions in fruit stalk tissue in vitro. However, fungicide treatments on trees in the orchards were ineffective in reducing bunch drop. On the other hand, restraining the growth rate of the fruit stalk, by reducing irrigation levels (to 20%) during the period of fruit stalk development and growth, significantly reduced bunch drop levels in most of the examined plots. These data suggest that bunch drop in 'Medjool' date palm is caused mainly by physiological disorders related to fruit stalk development and growth.
Note:
Related Files :
Cross-cut
Deficit irrigation
fungi
Fusarium proliferatum
Hexapoda
Phoenix dactylifera
Sabella
V-cut
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21548
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:45
Scientific Publication
Reevaluation of factors affecting bunch drop in date palm
45
Cohen, Y., Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Freeman, S., Department of Plant Pathology and Weed Research, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zveibil, A., Department of Plant Pathology and Weed Research, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zvi, R.B., Zemach Regional Agriculture Research Center, Jordan Valley 15132, Israel
Nakache, Y., Eden Experimental Station, Bet Shean Valley, Israel
Biton, S., Israeli Ministry of Agriculture and Rural Development, Extension Service
Soroker, V., Department of Entomology, Institute of Plant Protection, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Reevaluation of factors affecting bunch drop in date palm
Severe damage has been observed in Israeli date palm (Phoenix dactylifera L.) plantations of the Medjool cultivar as a result of drying and dropping of fruit bunches. Both fractures and rot occurred during peduncle (fruit stalk) development at proximal points located deep within the crown. The phenomenon has been previously described as "cross-cut" or "V-cut." The present study aimed to characterize the phenomenon and identify the main causal factors. Annual surveys have revealed high levels of fruit bunch drop in all 'Medjool' cultivation areas in Israel. Arenipses sabella and other insects were only occasionally detected in the damaged fruit stalks. Similar damage levels observed in insecticide-treated and untreated plots suggested that insects were not directly responsible for this phenomenon. Tissue decay was detected in many of the freshly fallen fruit stalks. The pathogenic fungus, Fusarium proliferatum, was detected in most of the necrotic fruit stalks. Fusarium proliferatum isolates from infected fruit stalks generated necrotic lesions in fruit stalk tissue in vitro. However, fungicide treatments on trees in the orchards were ineffective in reducing bunch drop. On the other hand, restraining the growth rate of the fruit stalk, by reducing irrigation levels (to 20%) during the period of fruit stalk development and growth, significantly reduced bunch drop levels in most of the examined plots. These data suggest that bunch drop in 'Medjool' date palm is caused mainly by physiological disorders related to fruit stalk development and growth.
Scientific Publication
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