Field Evaluation of New Fungicide Mixture against Phytophthora infestans (Mont.) de Bary on Tomato
2011
Stephanovic, M. | Rekanovic, E. | Todorovic, B. | Potocnik, I. | Milijasevic-Marcic, S.
The effectiveness of the syntetic fungicides Infinito SC (fluopicolide + propamocarb hydrochloride, Bayer CropScience), applied at 1.2 and 1.6 L/ha, and Ridomil Gold MZ 68 WG (metalaxyl + mankozeb, Syngenta Agro Science AG) applied at 2.5 kg/ha against Phytophthora infestans, the causal agent of late blight on tomato, was evaluated on four localities in 2007 and 2008. Trials were established according to EPPO guideline PP 1/65(3). A complete randomized block design with four replicates per treatment was used in the experiment. Mean percent disease control values were calculated from the evaluations made towards the end of the trials, when differentiation between treatments was most obvious. Data were analysed by one-way completely randomized ANOVA, and means comparison performed by Duncan’s multiple range test. In 2007, the infection of untreated control plots ranged from 16.9 to 19.9%. Assesment after treatment showed high efficacy of Infinito SC at both concentrations. There was no significant difference between the efficacies of Infinito SC (91.1-98.1%) and Ridomil Gold MZ 68 WG (92.4-96.0%). In 2008, the infection of untreated control plots was higher, ranging from 20.1 to 25.7%. Comparing the fungicide mixtures tested, the higher concentration of Infinito SC was found to demonstrate the highest efficacy in all trials (95.2-97.0%), while the efficacies of Infinito SC at lower concentration (94.7- 96.0%) and Ridomil Gold MZ 68 WG (94.8-96.3%) were slightly lower, but there was no significant difference between any of these data. All treatments were effective against P. infestans and significantly reduced disease severity in all experiments, compared to the untreated control.
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