Sources and seasonal dynamics of Alternaria inoculum associated with leaf blotch and fruit spot of apples

Harteveld, D. O. C., Akinsanmi, O. A., Dullahide, S. and Drenth, A. (2014) Sources and seasonal dynamics of Alternaria inoculum associated with leaf blotch and fruit spot of apples. Crop Protection, 59 35-42. doi:10.1016/j.cropro.2014.01.011


Author Harteveld, D. O. C.
Akinsanmi, O. A.
Dullahide, S.
Drenth, A.
Title Sources and seasonal dynamics of Alternaria inoculum associated with leaf blotch and fruit spot of apples
Formatted title
Sources and seasonal dynamics of Alternaria inoculum associated with leaf blotch and fruit spot of apples
Journal name Crop Protection   Check publisher's open access policy
ISSN 0261-2194
1873-6904
Publication date 2014-05
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.cropro.2014.01.011
Open Access Status
Volume 59
Start page 35
End page 42
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Formatted abstract
Alternaria leaf blotch and fruit spot caused by Alternaria spp. cause annual losses to the Australian apple industry. Control options are limited, mainly due to a lack of understanding of the disease cycle. Therefore, this study aimed to determine potential sources of Alternaria spp. inoculum in the orchard and examine their relative contribution throughout the production season. Leaf residue from the orchard floor, canopy leaves, twigs and buds were collected monthly from three apple orchards for two years and examined for the number of spores on their surface. In addition, the effects of climatic factors on spore production dynamics in each plant part were examined. Although all four plant parts tested contributed to the Alternaria inoculum in the orchard, significant higher numbers of spores were obtained from leaf residue than the other plant parts supporting the hypothesis that overwintering of Alternaria spp. occurred mainly in leaf residue and minimally on twigs and buds. The most significant period of spore production on leaf residue occurred from dormancy until bloom and on canopy leaves and twigs during the fruit growth stage. Temperature was the single most significant factor influencing the amount of Alternaria inoculum and rainfall and relative humidity showed strong associations with temperature influencing the spore production dynamics in Australian orchards. The practical implications of this study include the eradication of leaf residue from the orchard floor and sanitation of the canopy after harvest to remove residual spores from the trees.
Keyword Alternaria
Epidemiology
Fruit tree
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2015 Collection
 
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