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Journal of Phytopathology - Phytopathologische Zeitschrift (1998) 146, 385-391
A.A. Seif and R.J. Hillocks (1998)
Some factors affecting infection of citrus by Phaeoramularia angolensis
Journal of Phytopathology - Phytopathologische Zeitschrift 146 (8-9), 385-391
Abstract: Fruit and leaf spot disease caused by Phaeoramularia angolensis is the most important disease of citrus in Kenya. Current control recommendations are to apply copper fungicide sprays every 2 weeks during the main rainy season. Factors affecting lesion production on attached and detached citrus leaves and fruit were studied in order to provide the background information to target the spray timing to periods of maximum susceptibility. Results showed that leaf infection was dependent on high inoculum levels, periods of high humidity in excess of 24 h and moderate temperatures of around 25°C. Although all the citrus species tested were susceptible, the degree of susceptibility varied. Marsh seedless grapefruit was the most susceptible and Tahiti lime the least susceptible of those tested. Spore germination on the leaf, germ-tube penetration and sporulation capacity of the lesions were independent of cultivar/species and the determinant of susceptibility appeared to be the length of the incubation and latent periods. Fruit infection required a shorter wetting period than did leaf infection, but the period required for successful infection increased with increasing fruit age. The implications of these findings for improved fungicide spray recommendations are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Rory J. Hillocks
Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
resistance/tolerance/defence of host
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Pseudocercospora angolensis | Citrus (genus) |