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Timing of Infection and Development of Alternaria Diseases in the Canopy of Apple Trees

Harteveld, D. O. C. and Akinsanmi, O. A. and Chandra, K. and Drenth, A. (2014) Timing of Infection and Development of Alternaria Diseases in the Canopy of Apple Trees. Plant Disease, 98 (3). pp. 401-408. ISSN 0191-2917; 1943-7692

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Article Link(s): http://dx.doi.org/10.1094/pdis-06-13-0676-re

Abstract

Alternaria leaf blotch and fruit spot of apple caused by Alternaria spp. cause annual losses to the Australian apple industry. Erratic control using protectant fungicides is often experienced and may be due to the lack of understanding of the timing of infection and epidemiology of the diseases. We found that Alternaria leaf blotch infection began about 20 days after bloom (DAB) and the highest disease incidence occurred from 70 to 110 DAB. Alternaria fruit spot infection occurred about 100 DAB in the orchard. Fruit inoculations in planta showed that there was no specific susceptible stage of fruit. Leaves and fruit in the lower canopy of trees showed higher levels of leaf blotch and fruit spot incidence than those in the upper canopy and the incidence of leaf blotch in shoot leaves was higher than in spur leaves. Temperature, relative humidity, and rainfall affected leaf blotch and fruit spot incidence. The gained knowledge on the timing of infection and development of disease may aid in the development of more effective disease management strategies.

Item Type:Article
Business groups:Horticulture and Forestry Science
Subjects:Plant culture > Fruit and fruit culture
Plant pests and diseases
Deposited On:01 Jul 2014 04:05
Last Modified:01 Jul 2014 04:05

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