02489naa a2200181 a 450000100080000000500110000800800410001910000190006024501160007926000090019552019330020465000160213765000390215365000100219265000210220270000190222377300650224211336062023-09-05       2023    bl uuuu     u00u1 u    #d1 aRESENDE, R. S.  aEfficacy of bactericides for management of bacterial bulb rot in onion, Brazil, 2021-22.h[electronic resource]  c2023  aA trial was conducted in 2021-22 at the Epagri Experimental Station (EPAGRI) in Ituporanga, Santa Catarina, Brazil, to evaluate the potential of bactericide products for managing bacterial bulb rot. Plants of onion (SCS373-28, Valessul), at the 3-leaf stage, were transplanted into a field with a previous history of Pantoea ananatis and Burkholderia gladioli pv. alliicola. Twelve treatments and a nontreated control were arranged in a randomized block design with four replications. Plots were 3 m wide (with 33 cm between rows) by 2.75 m long (with 10 cm between plants), providing 243 plants per plot. Treatments were applied eight times at 7-day intervals, starting at the bulb initiation stage, which occurred approximately 75 days after transplantation. Treatments were applied using a CO2-pressurized backpack sprayer at a volume equivalent to 500 L/ha. The harvesting was carried out 120 days after transplanting. Subsequently, approximately 175 bulbs from the central rows of each plot were field-cured for about 10 days, topped, size-graded, weighed, and inspected for bulb rot. The incidence of the disease was determined by cutting all soft bulbs longitudinally and calculating the percentage of bulbs with any visible rot relative to the total number of bulbs. The asymptomatic bulbs were stored in plastic boxes for 100 and 180 days, followed by longitudinal cutting and inspection for bacterial rot. Marketable bulbs were considered those with a diameter of≥ 35 mm. The effect of treatments was analysed using analysis of variance (ANOVA). Means for each variable were separated using the Tukey?s pairwise procedure. Despite eight applications of treatments, there was no significant reduction in the incidence of bulb rot at harvest, after storage for 100 and 180 days, or in marketable yield when compared to the non-treated control plots. No phytotoxicity was observed because of treatment applications.  aAllium cepa  aBurkholderia gladioli pv alliicola  aonion  aPantoea ananatis1 aARA??JO, E. R.  tPlant Disease Management Reports, St. Paul, MNgv. 17, 2023.