03342naa a2200241 a 450000100080000000500110000800800410001910000150006024501260007526000090020152025890021065000140279965000140281365000260282765000250285370000190287870000170289770000180291470000140293270000160294670000190296277301190298111353092024-12-12       2024    bl uuuu     u00u1 u    #d1 aOGOSHI, C.  aVariability of postharvest pyrimethanil effects on decay during and after storage of 'Fuji' apple.h[electronic resource]  c2024  aThe study evaluated the effects of postharvest treatment with the fungicide pyrimethanil (9.6 g a.i. tonne-1) on apple fruit decay. Four experiments were performed under large-scale commercial storage conditions using ?Fuji? apples grown in Southern Brazil. In Experiments 1 and 2, fruit harvested in early and advanced maturity were stored in a controlled atmosphere (CA, 1.2 kPa O2 &lt0.5 kPa CO2, 0.8 oC) for 240 d. In Experiments 3 and 4, the fruit were stored in CA for 150 d and in the air for 105 d, respectively. In each experiment, fruit samples from 3 to 10 orchard plots were collected from bins of commercially harvested fruit. Ten fruit samples of  400 kg each (bins) were used for fruit assessment after storage for each orchard plot. Within 7 d after harvest, half of the samples from each orchard plot were treated with the fungicide in commercial storage facilities using thermal fogging (ActiMist?) for 24 h. After storage, one subsample of 100 decay-free apples was selected from each sample and held at 22 oC for a seven-day shelf life. The remaining fruits were assessed for the incidence of decay immediately after storage (day 0). The average incidence of total decay from each experiment ranged from 4.5 % to 18.7 % after storage and 19.5 % to 38 % after the shelf life for control fruit. Bull?s-eye was the main rot symptom in 3 of the four experiments, followed by blue mold, gray mold, and moldy core rot after storage. After the shelf life, the predominant decay symptom was blue mold followed by Bull?s-eye rot, gray mold, and moldy core rot. Fungicide treatment reduced the incidence of total decay in all experiments. The contrast in incidence of total decay between control and fungicide ranged from 2.0 % to 5.8 % after storage and 13.7 % to 21.8 % after shelf life, depending on the experiment. The fungicide reduced the incidence of blue mold, Bull?s-eye, and gray mold in 2, 3, and 1 of the four experiments after storage and 4, 3, and 0 of the four experiments after shelf life, respectively. The fungicide reduced moldy core rot in the experiment with the highest incidence. The incidence of bitter rot varied from 0.0 % to 4.4 % depending on the experiment and was unaffected by the fungicide. However, the incidences of Alternaria rot, white rot, and Rhizopus rot were consistently low (≤ 1%) and unaffected by the fungicide. The results reinforce that the orchard is a major source of variation in decay incidence and the development of decay symptoms during the shelf life is greater than during a long-term cold storage period.  afruit rot  afungicide  aMalus Domestica Borkh  apostharvest diseases1 aARGENTA, L. C.1 aB??CHELE, F.1 aVIEIRA, M. J.1 aALVES, J.1 aNESI, C. N.1 aNEUWALD, D. A.  tIn: INTERNATIONAL POSTHARVEST SYMPOSIUM , 9., 2024, Nova Zel??ndia. Abstracts... Nova Zel??ndia: ISHS, 2024. p. 84