02679naa a2200193 a 450000100080000000500110000800800410001910000200006024501140008026000090019452020650020365300250226865300250229365300190231870000150233770000190235270000180237177300960238911291922019-11-28       2019    bl uuuu     u00u1 u    #d1 aMONTEIRO, F. P.  aPith necrosis of tomato caused by Pseudomonas viridiflava may not decrease production.h[electronic resource]  c2019  aAims: This study aimed to measure the losses in the production of tomato plants caused by the bacteria P. viridiflava.Study Design:Experimentswere  performed  in  a  completely  randomized  design  with  six replicates.Place and Duration of Study:The study was conducted on the Ca??ador experimental station of the  Agricultural  Research  and  Rural  Extension  Enterprise  of  Santa  Catarina  (EPAGRI)  from October to April during 2017/2018 and 2018/2019 crop season.Methodology:Bacteria  were  isolated  from  tomato  plants  with  pith  necrosis  symptoms,  using nutrient  agar.  The  isolated  strain  was  identified  by  a  scheme  of  tests  for  bacteria  that  emit fluorescence, known as LOPAT, and by sequencing the 16S rDNA region. Tomato plants were cultivated for two seasons during 2017/2018 and 2018/2019. In the first year the cultivar Paronset was cultivated and in the next season the experiment was performed with the cultivars Compack,Nagai, Paronset and Pizzadoro. During the production season, tomato fruits were harvested and the weight was accounted for. At the beginning of the first bunch formation, the stems of the plant were  inoculated  with  wood  sticks  containing  bacterial  colonies  removed  from  a  48h-Petri  dish culture medium. Tomato plants cultivated as control treatments were not inoculated. At the end of the cultivation seasons, the stems were cut to analyze the pith necrosis progress.Results:In both cultivation seasons, there was no decrease in the production associated with the pith necrosis caused by P. viridiflavaEPAGRI BacPvT1 because the total weight of fruits harvested from inoculated plants was not statistically different compared to the non-inoculated plants. The disease progressed in all inoculated plants and adventitious root formation as external symptoms was observed.Conclusion:The  bacteria Pseudomonas  viridiflavaEPAGRI  BacPvT1,  one  of  the  etiological agents of pith necrosis of tomato, may not decreasethe production. Even causing some injuries, it may be not cause any damage  aFluorescent bacteria  aSolanum lycopersicum  atomato disease1 aOGOSHI, C.1 aCARDOSO, D. A.1 aPERAZZOLI, V.  tAsian Journal of Agricultural and Horticultural Research, Londongv. 4, n. 4, p. 1-6, 2019.