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Response of cucumber to target spot as a function of plant age and effect of products on disease control

Grant number: 20/13494-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2021
Effective date (End): December 31, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal researcher:Ivan Herman Fischer
Grantee:Lucas Meleiro da Silva
Home Institution: Departamento de Descentralização do Desenvolvimento (APTA Regional). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil


The target spot, caused by Corynespora cassiicola, occurs in several cultivated species, being considered an important disease in cucumber. This project aims to determine the response of the cucumber to the target spot according to the age of the plant, seeking to avoid economic damage to producers and to present a recommendation for preventive management of the target spot with fungicides and phosphite-based products, as an alternative solution and using methods that are less harmful to the environment. Japanese cucumber plants of Soldier cultivar will be grown on a commercial pine-bark substrate, in 10 L pots. The leaves will be inoculated by spraying the C. cassicola conidia suspension (1x104 conidia / ml). In the first experiment, the plants will be inoculated 20, 30 and 40 days after sowing and in the second experiment the effect of chlorothalonil and metiram + pyraclostrobin fungicides and potassium and zinc phosphites, whether or not combined with Silwet L-77 Ag® and Break-Thru® adhesive spreaders, will be evaluated when applied preventively four days before inoculation of the pathogen. In both experiments, the severity of the disease will be evaluated on the 2nd and 3rd true leaves at five and ten days after pathogen inoculation; the fresh and dry mass of the aerial part of the plants at 60 days after sowing; the number and fresh weight of fruits, and the number of leaves and plant height at intervals of 7 to 10 days from the inoculation of the pathogen until 60 days after sowing.. The experiments will be carried out in a greenhouse, in a completely randomized block design, in a factorial scheme for the effect of the products. The results will be subjected to analysis of variance and compared by the Tukey test, at the 5% probability level. (AU)

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