Resumo

PARRA, M et al. Effectiveness of systemic fungicides for controlling leaf spots caused by Alternaria sp. and Phoma sp. in Prosopis alba seedlings. Quebracho (Santiago del Estero) [online]. 2019, vol.27, n.1, pp.47-47.  Epub 01-Out-2019. ISSN 0328-0543.

Leaf spots caused by Phoma and Alternaria are common symptoms in algarrobo blanco [whitemezquite] (Prosopis alba Griseb.) seedlings in nurseries, when weather conditions (cool, cloudy and drizzling days) are favorable for the emergence of these fungi. In view of this problem, it was hypothesized whether or not two selected fungicides were effective in controlling said disease. With this purpose in mind, a completely randomized experimental design consisting of three treatments and five repetitions was carried out. One of the treatments was the control, another one was the application of Azoxistrobina + Difenoconazole, and the third one involved the application of Carbendazim. Upon applying the fungicides, the incidence of the disease on each seedling as well as the effectiveness of the fungicides was determined. The results of the variable “incidence” were subjected to analysis of a mixed generalized linear model. Of statistical analysis showed significant differences among treatments, thus leading to the conclusion that the application of fungicides caused a reduction in the disease while Azoxistrobina + Difenoconazole exhibited the greatest effect. It was further determined that Azoxistrobina + Difenoconazole is about 13% more effective in controlling the disease.

Palavras-chave : fungicides; forest nurseries; Prosopis alba; leaf spots.

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