Guignardia citricarpa is present in Argentina
Citrus black spot (Guignardia citricarpa – EPPO A1 quarantine pest) had been reported in the past in Argentina, but these records were not confirmed. However, in the last few years, the disease has become important and has been recorded in the two major citrus-producing regions: Tucuman, Misiones and Corrientes. The disease also occurs in the region of Entre Rios where the first symptoms were observed on Valencia Late oranges in 1986/87. In this region, the pycnidial form (Phyllostictina citricarpa) was readily isolated from most symptomatic fruits, but the sexual stage, G. citricarpa has not yet been detected (no details are given for the other regions of Argentina mentioned above). All commercial cultivars are susceptible to G. citricarpa to a varying extent (except sour orange, Citrus aurantium). G. citricarpa can cause significant losses due to premature fruit drop, and refusal of fruits for fresh market (as they are disfigured by the presence of black spots).
Sources
Garrán, S.M. (1996) Citrus black spot in the Northeast of Entre Rios: etiology, epidemiology and control.
Proceedings of the International Society of Citriculture, 466-4470.
Rodriguez, V.A.; Mazza Gaiad, S.M. (1996) The effects of fungicides and fertilization on the control of black spot of citrus (Guignardia citricarpa).
Proceedings of the International Society of Citriculture, 482-484.