Data/hora: 16/06/2024 08:27:15

Biblioteca(s): | Epagri-Sede.
Data corrente: | 20/06/2017
Data da última atualização: | 01/08/2017
Autoria: | BONIN, B.; BEM, B.; BRIGHENTI, A. F.; WÜRZ, D. A.; ALLEBRANDT, R.; BRIGHENTI, E.; ARAUJO, L.; PINTO, F. A. M. F.; BOGO, A.
Título: | Intensity of Anthracnose in resistant varieties (PIWI) in the high altitude regions of southern Brazil.
Ano de publicação: | 2017
Fonte/Imprenta: | BIO Web of Conferences, França, v. 9, p. 01017, 2017.
Idioma: | Inglês
Conteúdo: | Anthracnose (Elsinoe ampelina) is one of the major fungal diseases in southern Brazil. Rainy springs, fog, relative humidity above 90% and cold winds are ideal conditions for the development of the disease, its control is usually carried out with systematic applications of fungicides. Genetic resistance to anthracnose is found in both American and Asian species. The sources of resistance to anthracnose of Asian origin are more promising for genetic improvement purposes, because there is an indication that the inheritance for this character is dominant. Among the Asian species, V. amurensis is most used in the genetic improvement of the vine. The varieties with resistance genes to mildew and powdery mildew, such as PIWI (Pilzwiderstandsfähige) varieties, are an alternative to reduce the number of conventional fungicide applications and reduce production costs for grapevine planting in southern Brazil. However, few studies have been conducted with anthracnose for PIWI varieties. The objective of this study was to evaluate the different degrees of tolerance to Anthracnose infection in three  PIWI varieties (Cabernet Cortis, Regent and Bronner) compared to the Cabenert Sauvignon variety. The experiment was conducted at EPAGRI Experimental Station, located in the city of São Joaquim, Santa Catarina State (28°17?39? S; 49°55?56?W, altitude 1,415 m a.s.l.), during 2016/2017 growing season. The vineyard was planted in 2013, the plants were grafted on Paulsen 1103, vines were trained in vertical shooting positioning trellis and spacing 3.0 x 1.5 m. The evaluation of the disease was performed every 15 days from the onset of symptoms, which occurred on September 25, approximately 15 days after sprouting, and lasted for a period of two months, under the condition of infection Natural. The severity of the disease was evaluated according to the methodology proposed by Pedro Junior et al. (1998), applying a scale of notes. The intensity of the disease was compared by epidemiological measures: time to reach maximum disease severity (TRMDS), maximum disease severity (Smax), and area under the severity disease progress curve (AUDSPC). The experiments followed a randomized completed-block design with three replications per variety and all branches and leaves of each plant were evaluated. The severity data were transformed into a percentage to perform the statistical analysis by the Tukey test (P <0.05). Although the PIWI varieties were resistant to mildew, they were susceptible to anthracnose. Bronner and Cabernet Cortis showed on average the same intensity of disease in the leaves and branches as the Cabernet Sauvignon variety, which presented 17.5% of average severity. The Cabernet Cortis variety had an average severity of 17.5%, and Bronner presented 15.6%. The Regent variety showed greater susceptibility to the pathogen, differing statistically from the other varieties evaluated, with an average of 41.6% of leaf and branch severity. Therefore, the mildew resistant varieties evaluated had the same degree or greater susceptibility to Anthracnose compared to the Cabernet Sauvignon variety under the climatic conditions of southern Brazil.
Palavras-Chave: | Bronner; Cabernet Cortis; Elsinoe ampelina; Regent.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal

URL:

http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39354.pdf
http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39272.pdf

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