Measures to Prevent and Combat Pear Scab (Venturia pirina) in the Climate Conditions of Lapusel

Abstract

In this paper we studied the emergence and development of pear scab (Venturia pirina), as well as the combat methods, testing a couple of fungicides. The aim of the research has been to highlight the resistance, respectively the sensitivity of some pear varieties against the fungi attack, in order to make recommendations for the new plantations, as well as the testing of 7 fungicides, remarking the product with the highest biological effectiveness. The researches were conducted in the years 2013-2014 at the company SC Mecanochim Lapusel, Maramures County. The experiments were conducted on plots planted with the Olivier de Serres and Bergamotte Crassane varieties. The attack was calculated determining the attack frequency, intensity and degree. The linear-interrupted method was used, comprising 3 variants of 5 trees each. Analyzing the climate data, it has resulted that in 2013 scab had favourable development and attack conditions. The Olivier de Serres variety was noted for its resistance to fungus attack, with a frequency of 0.2-1.3% on fruits and insignificant frequency on leaves, for all 7 tested product variants. The Bergamotte Crassane variety was placed on the other end, with a higher frequency and intensity, both on fruits (2-3%) and on leaves (2.5-3.5%). The infections diminished in 2014 due to the unfavourable climatic conditions. Three products had better results, from the seven tested products, thus: Alcupral 50PU, Stroby DF and Chorus 50 WG.