Biological effectiveness of a new multifunctional biopesticide in the protection of organic potatoes from diseases

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Date
2021Author
Novikova, I.I.
Minin, V.B.
Titova, J.A.
Krasnobaeva, I.L.
Zaharov, A.M.
Perekopsky, A.N.
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Crop disease control is of particular importance in organic crop production, as the use
of chemical pesticides is prohibited there. A new multifunctional biofungicide Kartofin was
selected and used to optimize the phytosanitary state of organic potatoes ecosystems. Previously
of studies indicated the prospects of using the biofungicide to control numerous fungal and
bacterial diseases during the potato growing season and storage of tubers. The crop rotation field
experiment was carried out in 2017–2020 at the Experimental Station of the IEEP - BRANCH
OF FSAC VIM near Saint-Petersburg (59°65 N and 30°38 E). The soil of experimental plots is
sod-podzolic light loamy. In the potatoes (variety Udacha) field, a 2-factor field experiment was
established which studied:
the action of biofungicide Kartofin;
the effect of the compost.
The experiment was established on the plots with the size 61.6 m2
each. The experiment had four
replications.
Three doses of the compost were used which corresponded to different levels of the potato
productivity. Potatoes were treated with biofungicide at the time of planting and by foliar spray
during the growing season. The combined use of compost at a dose of 4 t ha-1
and biofungcide
made it possible to achieve the yield of standard tubers of 27.3–28.2 t ha-1 with their low
incidence of fungal diseases. The biological effectiveness of the biofungicide Kartofin in reducing
the prevalence and development of a complex of fungal diseases (alternariosis, late blight, stem
form of rhizoctoniosis) on potato plants of the Udacha variety reached 82.2–89.9%.