Fitopatologia Brasileira (2004) 29, 532-537

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Marcel B. Spósito, Renato B. Bassanezi and Lilian Amorim (2004)
Resistência à mancha preta dos citros avaliada por curvas de progresso da doença
[Resistance to citrus black spot by the analyses of disease progress curves]
Fitopatologia Brasileira 29 (5), 532-537
Abstract: Citrus (Citrus spp.) black spot, caused by Guignardia citricarpa, is responsible for serious damage to citriculture in the State of São Paulo. The main varieties of oranges (Citrus sinensis) in São Paulo are 'Hamlin', 'Pera', 'Valência' and 'Natal'. The literature suggests that late varieties such as 'Valência' and 'Natal' are most susceptible to citrus black spot, because these varieties are severely affected at harvest time. Nevertheless, there is no information about the temporal disease progress in the field. Resistance of the orange varieties 'Hamlin' (early), 'Pera' (mid-season), and 'Valência' (late) to citrus black spot was assessed in a commercial grove, under conditions of natural infection. Disease severity and disease incidence were assessed in 100 fruits of 100 plants of each variety, every 15 days, from the first appearance of symptoms in the field until harvest. The monomolecular model was fitted to the data of the disease progress curves for the three varieties. The rate parameter (r) of the disease progress curve was not different for the three varieties. Varieties 'Hamlin', 'Pera' and 'Valência' present the same degree of susceptibility to the MPC.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Database assignments for author(s): Marcel B. Sposito, Lilian Amorim, Renato B. Bassanezi

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Phyllosticta citricarpa Citrus (genus) Brazil (south)