Data/hora: 06/06/2024 13:50:57

Biblioteca(s): | Epagri-Sede.
Data corrente: | 14/10/2022
Data da última atualização: | 14/10/2022
Autoria: | ARAÚJO, E. R.; RESENDE, R. S.
Título: | Efficacy of fungicide treatments to control downy mildew of onion in Brazil, 2021.
Ano de publicação: | 2022
Fonte/Imprenta: | Plant Disease Management Reports, St. Paul, MN, v. 16, 2022.
Idioma: | Inglês
Conteúdo: | The State of Santa Catarina is the largest Brazilian producer of onions, with an annual production of over 400 thousand tons. Onion downy mildew (Peronospora destructor) is the main onion disease in the state. The management of the disease is carried out through frequent fungicides sprays (one to two sprays per week). This trial aimed to evaluate the effect of fungicide sprays on the area under the disease progress curve - AUDPC and on the commercial yield of onion in experimental plots in the field. Onion seedlings were grown on a soil bed and approximately 60 days after sowing, they were transplanted (July 19, 2021) to the experimental area. The experimental plots consisted of 150 plants (six rows with 25 plants) arranged in a spacing of 0.10 m (between plants) and 0.35 m (between rows), simulating a plant density of approximately 300,000 plants per hectare. The treatments started 35 days after transplanting. Nine weekly sprays were performed, with a volume corresponding to 500 L/ha. The severity was assessed fortnightly using a rating description scale, which assigns scores to the entire plot (score 1 = 0% severity to score 9 = 100% severity). The values from scale scores of the experimental plots were used to calculate AUDPC. The harvest was carried out 113 days after transplanting. Commercial yield (onion bulbs with diameter&#8805; 35 mm) was calculated from the central rows of each plot, discarding single border rows (Table 1). The experiment was randomised in blocks designed with four replications. The data were analysed using ANOVA and, in case of significance of the treatments, means were grouped with Scott-Knott cluster.
Thesagro: | Allium cepa; chemical control; Peronospora destructor.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_55203.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (107565-1) - UPC - AP - DD -  -  -  - DIS