Abstract
Fruit rot, besides causing losses in production, reduces the final quality of the product interfering in the commercialization. The objective of this work was to evaluate the efficiency of alternative products applied to pre-harvest for control of brown rot (Monilinia fructicola) and soft rot (Rhizopus spp.) In peaches. The experiment was conducted in the municipality of Nepomuceno-MG, in a peach orchard of the cultivar Diamante. The experimental design was a randomized block design with 7 treatments and 3 replicates, with field plots formed by 12 plants (arranged in 3 rows), being considered for the evaluations only the two central plants. Three applications were made at flowering and at 21; 7 and 3 days before harvest, with solutions containing the following treatments: 1-Clove oil 0.1%; 2-silicate clay 1.5%; 3-Phosphite K 0.20%; 4-Benzalkonium chloride 0.25%; 5-Azoxystrobin 0.02%; 6-Iprodione 0.15%; 7-Witness (water only). Treatments 4 and 5 were applied only at 21 and 7 days before harvest. Ten fruits were selected and placed in sterile trays under uncontrolled conditions, with disease evaluations at 3 and 6 days after the beginning of storage in 2005 and at 3; 6 and 9 days in 2006. The iprodione controlled the incidence of M. fructicola and had no effect on Rhizopus spp. Clove oil controlled the incidence and severity of M. fructicola by the fifth day and Rhizopus spp. by the sixth day. The phosphites of k, benzalkonium chloride and azoxystrobin were efficient in controlling the incidence and severity of Rhizopus spp. and had no effect on M. fructicola.
Highlights
IntroductionThe production of peach in Brazil in the last four decades has achieved a re-
It should be noted that in the first year of evaluation (2014), brown rot prevailed due to Monilinia fructicola (Table 1), whereas in the second year (2015), the soft rot caused by Rhizopus spp. predominated
The results indicate that the treatment with iprodione applied in the flowering stage and pre-harvest (21, 7 and 3 days before harvest) significantly reduced the incidence of brown rot up to the fifth day after treatment
Summary
The production of peach in Brazil in the last four decades has achieved a re-. This was possible thanks to the work developed by the research, such as genetic improvement and adaptation by means of evaluation of cultivars and cultural treatments, such as grafting seedlings, pruning systems, breaking of dormancy through chemical spraying, irrigation use, thinning and protection of fruits through bagging and spraying [1]. Despite the promising future for peach production in Brazil, some post-harvest diseases may compromise activity. Brown rot (Monilinia fructicola) and soft rot (Rhizopus spp.), which are the most important and responsible for damages in the quantity and quality of peach fruits [3] [4] [5]
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