Influential Factors upon the Occurrence and Evolution of Late Blight (Phytophthora infestans) on some Potato Varieties 2 Cultivated in Barsa Land

Manuela Hermeziu, Gavrilă Morar, Sorina Nitu, Radu Hermeziu, Cristina Moldovan, Victor Donescu

Abstract


Late blight caused by Phytophthora infestans is one of the most devastating diseases of potato. The farmers controll
the disease using a lot of fungicides, spraying between 8-16 times during the season. Field trials were carried out to the
National Institute of Research and Development for Potato and Sugar Beet Brasov during the years 2014 – 2016. It was
used a complet randomized block design with four replicates. Planting was made in 24
th
1
March 2016 and in 31
March
2017.
 
In all cases, cultivation and maintenace was in line with current good agricultural practice. In the three years tacking
into study late blight appeared relatively early due to favorable climatic conditions.The assessment used a key on the
whole plant. It assess the overall amount of necrotic tissue per plant on a scale from 1 (resistant) to 9 (highly susceptible).
In 2014 the first appearance of late blight was registered on 17 June, in 2015 in 1 July and in 2016 in 31 May.  The main
aim of this research was to test the influence of two different densities (53300 plants/ha and 44400 plants/ha) and two
different late blight control technologies (using on side only contact fungicides - TECH1 and on the other side systemic
and contact fungicides -TECH2) on three most cultivated varieties (Riviera, Christian and Roclas).

Keywords


potato late blight, climatic factors, technology, variety, densities.

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