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2019, vol. 47, iss. 3, pp. 147-156
Control of gray rot (Botrytis cinerea Pers.:Fr.) on lettuce
University of Novi Sad, Faculty of Agriculture
Development of integrated management of harmful organisms in plant production in order to overcome resistance and to improve food quality and safety (MESTD - 46008)

Keywords: lettuce; B. cinerea; cyprodinil + fludioxonil; biostimulant
The most important lettuce pathogens in our agroecological conditions are Botrytis cinerea, causal of gray rot and Bremia lactucae, causal of downy mildew. Bearing in mind the demanding market, different production requirements of lettuce, as well its varieties, biological assays with fungicides are very important. The experiment was set up in 2015, in the locality of Provo (Mačva, western Serbia), in the crop of lettuce Seter variety, using standard OEPP methods. Fungicide based on cyprodinil + fludioxonil (Switch 62.5 WG) has been applied in concentration of 0.7 kg/ ha. Biostimulant (Megafol; applied doses 2 l/ha), and mixture of fungicide with biostimulant were also used in the bioassay. Foliar treatment of plants was carried out by backpack sprayer, with a consumption of spray liquid of 400 l/ha. The experimental design was a randomized block design with four replications. The efficacy of the fungicide is determined by Abbott, while the significance of differences for the confidence interval of 95% was done using ANOVA. In the laboratory conditions, the physical and chemical properties (pH, suspendability, surface tension and electric-conductivity) of spray liquid fungicide and the mixture of the fungicide + biostimulant have been tested. Fungicide Switch 62.5 WG, as well as a mixture of Switch 62.5 WG + Megafol, exhibited efficiency from 70.9 to 86.5% in control of gray rot (B. cinerea). In all treatments where the fungicide, bio-stimulator, as well as mixtures of fungicide + biostimulants were applied, average weight of lettuce plants (413.2 to 433.4 g) was at a significantly higher level in comparison to the control (403.6 g). Physical and chemical properties of the spray liquids fungicide and mixture of fungicide + biostimulant are within acceptable limits and there is no significant change after 24 hours of standing. Mixtures of fungicide and biostimulant, based on physical and chemical properties exhibited compatibility.


article language: Serbian
document type: unclassified
published in SCIndeks: 05/09/2019

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