Influence of foliar herbicides treatment on malting barley (Hordeum vulgare L.) productivity of Emon, Vanessa and Vicky varieties

D. Atanasova*, V. Maneva

Institute of Agriculture, 8400 Karnobat, Bulgaria
(Manuscript received 1 July 2016; accepted for publication 26 August 2016)

Abstract. During the period 2012 – 2014 in the Institute of Agriculture, Karnobat a field experiment was conducted with winter malting barley varieties Emon, Vanessa and Vicky. The influence of broadleaf (dicotyledonous) herbicides alone and in their combination with wild oat (monocotyledonous) in tillering stage of the crop was studied in optimal and double doses. The herbicide selectiveness was assessed according to the EWRS scale. Yields were reported after harvest. In variety Vanessa during the treatment with Derby Super, Granstar Super, Sekator OD and combination of Puma Super 7.5 EW + Sekator OD in optimal doses, the yield does not differ from the weed control. Variety Vicky endures well the treatment with optimal doses in all of the tested herbicides, except Husar Max. In treatment with double doses, only Granstar Super does not affect negatively the yield of grain. Comparing the data from ANOVA about the role of herbicides and year conditions on the malting barley varieties it can be concluded that the yield of variety Emon is the most stable in regard to herbicides applied in optimal doses (5%), followed by Vanessa (17%) and Vicky (18%). At application of the herbicides in double doses, their influence is increased – in variety Emon up to 15%, and in varieties Vanessa and Vicky – up to 23%.

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Susceptibility of black currant varieties grown in Troyan to Antracnose (Gloeosporium ribis) Mont. et Desm

T. Stoyanova, I. Minev, P. Minkov

Abstract. The ratio of the following black currant varieties to economically important fungal disease antracnose (Gloeosporium ribes) is examined: Neosipayushchiyasya, Bogatir, Biryulevskaya, Ometta, Titania, Lissil, Hedda, Ben Moor, Ben Tirran, Ben Sarek, Ben Lomond and Silvergieters schwarze. They are grown in a plantation without a collector’s plant-protection activities in natural background contamination. In the varieties tested in the years of the study varying degrees of attack were established. The assault index reported at Ometta and Hedda varieties varies most widely. Years characterized by more rainfall favor stronger development of the disease. For the entire period of the study with the least antracnose attack outlines the following varieties: Ben Sarek, Bogatir, Silvergieters schwarze

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