03867naa a2200241 a 450000100080000000500110000800800410001910000130006024501390007326000090021252031200022165300260334165300130336765300210338070000190340170000120342070000210343270000140345370000160346770000130348370000150349677301140351111262772017-06-20       2017    bl uuuu     u00u1 u    #d1 aWURZ, D.  aOCCURRENCE OF ANTHRACNOSE IN SAUVIGNON BLANC AND CABERNET FRANC DUE TO BUD LOAD IN A NEW BRAZILIAN WINE REGION.h[electronic resource]  c2017  aDespite being a recent activity, high altitude regions of Santa Catarina State - Brazil have been shown to be able to produce high quality wines, however most of vineyards management techniques are not well defined, such as bud load. In addition, few studies relate management techniques to diseases occurrence, such as anthracnose, which is one of the major fungal diseases in southern Brazil. Rainy springs, fog, relative humidity above 90% and cold winds are ideal conditions for development of the disease, moreover in a dense canopy it is necessary strict control of the anthracnose, winter treatments are also necessary in order to reduce initial inoculum. The objective of this work was to evaluate the effect of different bud loads on the incidence and severity of anthracnose in shoots and leaves of Cabernet Franc and Sauvignon Blanc in high altitude regions of Santa Catarina State. The experiment was conducted in the 2016/2017 season, in a vineyard located in the city of São Joaquim ? Santa Catarina State (28°17'39"S and 49°55'56" W, 1230m a.s.l.). The vines were pruned at four different load levels: 15, 30, 50 and 75 buds per plant. The mean air temperature (°C) and rainfall (mm) were evaluated between August and December 2016, coinciding with the period of greatest susceptibility of the plants to anthracnose, thanks to climatic conditions favorable to its occurrence. The incidence was determined by the percentage of leaves and shoots with at least one lesion. The severity was assessed according to a diagrammatic scale, applying a score referring to the disease. In the early development stages of the analyzed varieties there were periods of rainfall and high relative humidity associated with low temperatures and cold winds, which resulted in favorable conditions to anthracnose. For Cabernet Franc and Sauvignon plant resulted in a higher incidence and severity of disease, higher bud load resulted in a more dense vegetative canopy, which associated with favorable climatic conditions resulted in higher disease pressure. For incidence of anthracnose in Cabernet Franc leaves, plants pruned with 15 and 30 buds resulted in the lowest values of anthracnose, while for leaf severity, 15 buds per plant resulted in the lowest severity value, while the other bud loads did not differed statistically from each other. For Sauvignon Blanc, there was lower incidence and severity for 15 buds per plant, while 75 buds per plant resulted in an increased incidence and severity of anthracnose in the leaves. The high altitude regions of Santa Catarina present a high occurrence of anthracnose, and with the reduction of vegetative canopy densification it is possible to reduce it. When adopting a pruning system with high gemstones, preventive measures must be taken to avoid damage caused by the high intensity of anthracnose. The high altitude regions of Santa Catarina present high occurrence of anthracnose, a dense canopy favors its emergence. When adopting a pruning system with high bud load, preventive measures must be taken to avoid damage caused by high intensity of anthracnose.  ahigh altitude regions  aseverity  aVitis vinifera L1 aALLEBRANDT, R.1 aBEM, B.1 aBRIGHENTI, A. F.1 aBONIN, B.1 aREINEHR, J.1 aBOGO, A.1 aRUFATO, L.  tIn: WORLD VINE AND WINE CONGRESS, 40., 2017, Sofia, Bulgária. Abstracts... Bulgária: OIV, 2017. p. 310-312.