Efficacy of Copper Compounds in Controlling Xanthomonas campestris pv. vesicatoria, the Causal Agent of Bacterial Spot of Pepper

Abstract

The efficacy of several new formulations of copper compounds in controlling Xanthomonas campestris pv. vesicatoria in pepper was estimated in field conditions using artificial inoculation. The efficacies of Cuprozin 35 WP (copper-oxychloride) and Blauvit (copper-hydroxide) were tested in the localities Dobanovci and Kupinovo in 2005. Another two formulations, Cuproxat (copper-sulfate) and Fungohem SC (copper-hydroxide), were tested along with the previous two in the localities Zemun and Smederevska Palanka in 2006. Both bactericides tested in 2005 exhibited high efficacy in controlling X. c. pv. vesicatoria in both localities. However, there were no significant differences in the efficacy of Cuprozin 35 WP at higher concentration (74.3%-78.7%) and Blauvit (74.6%-78.9%) in the two trials. Cuprozin 35 WP decreased efficacy, but a satisfactory effectiveness was still achieved at lower concentration (66.5%-66.5%). In the experiments conducted in 2006, higher concentration of Fungohem SC showed the highest efficacy (86.1%-89.1%) in controlling bacterial spot of pepper. Blauvit, Cuprozin 35 WP and Cuproxat also exhibited high efficacy. However, there were no significant differences in the efficacy of these bactericides between the two localities. Fungohem SC applied at lower concentration was less effective (77.2%-80.0%) but its efficacy was still good enough. Our experiments showed that copper bactericides based on copper-sulfate, copper-oxychloride and copper-hydroxide exhibited satisfactory efficacy in controlling the causal agent of bacterial spot of pepper in our climatic conditions.

Ispitivana je efikasnost novijih formulacija bakarnih preparata u suzbijanju Xanthomonas campestris pv. vesicatoria na paprici u uslovima veštačke inokulacije u polju. U 2005-oj godini, na lokalitetima Dobanovci i Kupinovo, ispitivana je efikasnost preparata Cuprozin 35 WP (bakar- oksihlorid) i Blauvit (bakar- hidroksid). Tokom 2006. godine osim ovih preparata primenjeni su i Cuproxat (bakar-sulfat trobazni) i Fungohem SC (bakar-hidroksid), na lokalitetima Zemun i Smederevska Palanka. Preparati ispitivani u 2005-oj godini ispoljili su zadovoljavajuć u efikasnost u suzbijanju X. c. pv. vesicatoria na oba lokaliteta. Između efikasnosti preparata Cuprozin 35 WP pri višoj koncentraciji primene (74,3%-78,7%) i preparata Blauvit (74,6%-78,9%) nije zabeležena statistički značajna razlika u oba ogleda. Nešto nižu, ali zadovoljavajuć u efikasnost ispoljio je Cuprozin 35 WP pri nižoj koncentraciji primene (66,5%-66,5%). U ogledima izvedenim tokom 2006. godine, najveću efikasnost u suzbijanju prouzrokovača bakteriozne pegavosti paprike ispoljio je preparat Fungohem SC (86,1%-89,1%) pri višoj koncentraciji primene. Preparati Blauvit, Cuprozin 35 WP i Cuproxat pokazali su takođe visoku efikasnost tako da statistički značajne razlike nisu zabeležene između tretmana ovim preparatima na oba lokaliteta. Nešto nižu, mada zadovoljavajuću efikasnost imao je preparat Fungohem SC primenjen u nižoj koncentraciji (77,2%-80,0%). Naši ogledi pokazali su da preparati na bazi bakarsulfata trobaznog, bakar- oksihlorida i bakar- hidroksida u našim klimatskim uslovima ispoljavaju zadovoljavajuć­u efikasnost u suzbijanju prouzrokovača bakteriozne pegavosti paprike.