Acibenzolar-S-methyl in control of rust and coffee plant cercosporiose in field conditions

Luiz Henrique Monteiro Fernandes, Mário Lúcio Vilela de Resende, Ricardo Borges Pereira, Bruno Henrique Garcia Costa, Ana Cristina Andrade Monteiro, Pedro Martins Ribeiro Júnior

Abstract


The objective of this study was to evaluate the effect of inducing resistance acibenzolar-S-methyl (ASM), associated or not with the fungicide azoxystrobin + cyproconazole base, the control of Cercospora leaf rust and coffee under field conditions. The test was conducted in two crop years (2007/2008 and 2008/2009), in commercial plantation with cultivar Mundo Novo. The treatments were: ASM (25 g ha-1) applied 5 times monthly (December-Aprilharvest each year); fungicide (500 mL ha-1) and fungicide mixture (500 mL ha-1) + ASM applied 3 times (December,February and April of each crop year), the fungicide mixture (500 mL ha-1) applied 3 times (December, February and April of each crop year) + ASM applied 5 times (December to April of each crop year) , the fungicide mixture (750mL ha-1) applied 2 times (December and March of each crop year) + ASM applied 5 times (December to April of each crop year) and untreated. The rust control (84%) provided by the ASM was statistically similar to the treatment withthe fungicide (94%) in low crop year (2008/2009), when the intensity of the disease was not as high as in the year of crop high (2007/2008). In high crop year, ASM not controlled the cercospora, whereas in low crop years controlled the cercosporiose this product (77%) of the fungicide lower form (92%) and their mixtures (89-94%). In low harvest year, the ASM can be used to control Cercospora leaf rust and coffee and compatibility presented with the fungicide azoxystrobin + cyproconazole.

Keywords


Coffea arabica L.; Hemileia vastatrix; Cercospora coffeicola; induction of resistance



DOI: http://dx.doi.org/10.25186/cs.v8i1.309

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