Testing Some Fungicides for the Combat of Potato Mildew in the Pedoclimatic Conditions in Seini Town

Abstract

The aim of this survey was to set the biologic effectiveness of some homologated fungicides, in order to introduce them in the new programs of combating mildew in potato crops. The experimental surveys were carried out at the farm of SC Marmalus SRL of Seini, the Maramures County, during 2013 and 2014. The warning area method was used. The attack was calculated by determining the attack frequency, intensity and degree. In 2013, 8 varieties were tested against the mildew attack, as the Procura variant proved to be the most resistant, and Ostara the most sensible. In 2014, 14 fungicides were tested starting with the outbreaks of the alarm plot; then the appearance of mildew in natural conditions was taken into account. For testing, the sensible Ostara variety and the resistant Procura variety were used. The climatic conditions were favorable to the development of fungi, with high temperatures and atmospheric humidity. The best results were obtained for the Ridomil Gold Plus 42.5WG, for both varieties, with the effectiveness of 86.6% for the resistant variety, respectively, 85% for the sensitive variety. The worst results were obtained by the Dithane M45 product, with an effectiveness of 70.4% for Ostara, as for the Procura variant the Polyram DF product was used with an effectiveness of 73.7%. In the combating of Phythophtora infestans fungi, it is recommended to use with good results the product Ridomil Gold Plus 42.5WG, followed by the products Ridomil Gold X9Z86WG, Infinito 68.7 SC and Consento 450 SC.