Resumo

BAUTISTA-MONTEALEGRE, Luis Gabriel; BOLANOS-BENAVIDES, Martha Marina; ARGUELLES-CARDENAS, Jorge Humberto  e  FISCHER, Gerhard. Fertilization with nitrogen, phosphorus, potassium and calcium in blackberry (Rubus glaucus Benth.): Effect on Anthracnose under controlled conditions. Acta Agron. [online]. 2019, vol.68, n.3, pp.228-236. ISSN 0120-2812.  https://doi.org/10.15446/acag.v68n3.68337.

To propose alternatives for management Anthracnose (Colletotrichum gloeosporioides) in blackberry cultivation, an experiment was performed to estimate the effect of nitrogen, phosphorus, potassium and calcium on C. gloeosporioides strain 52 infections. A randomized complete block design was used with a treatment arrangement corresponding to an orthogonal central composed design. To evaluate the relationship between fertilization levels and the severity of the disease, an artificial inoculation was carried out on blackberry stems with thorns, by 0.5 cm mycelium discs at a concentration of 9.53x104 conidia, registered disease severity (S), incubation period (PI) and development rate (r). A cluster analysis was performed on the severity variable, a Pearson correlation analysis between variables, as well as a regression to estimate the effect of the nutrients applied on the severity of strain 52. The treatments were concentrated in four groups with S, PI and r between 15.9% to 91.8%, 9 to 15.3 days and 0.0254 to 0.0468, respectively. Positive and significant correlation was observed between S and r (P<= 0,001), and negative and significant, between PI with S and r (P < 0,001). Finally, through the regression analysis, a linear model was generated that allowed us to verify the decrease in severity with the increase in the dose of nitrogen and the increase in this with the growth of phosphorus and calcium levels.

Palavras-chave : Colletotrichum gloeosporioides; Mora castilla; nutrition; severity; development rate.

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