Chemical Control of Phytophthora infestans Pathogen on Potato Crop under Differentiated Fertilizing Conditions

Untill present, chemical control of Phytophthora infestans remains the most efficient and economic method. Therefore we compared three chemotherapy recipes in agro-pedo-ecoclimatic conditions within SDE Cojocna from May – September 2011, characterized by a slightly droughty precipitations regime, excepting July, slightly rainy, and by a warm and hot thermal regime compared to multiannual average, on a potato crop estabilished with planting material of Desiree cultivar, experimentally placed on three fields: an unfertilized one, a organically fertilized one and the last chemically fertilized, to test and estabilish which is the most therapeutically efficient treatment variant referred to fertilizing conditions. After comparison synthesis by Duncan test, it results that treatment recipe no.2, composed of Previcur Energy, Champ, Infinito, Antracol and Melody Compact fungicides, applied on the organically fertilized field caused the lowest attack degree (AD = 3.88%), and recipe no.3, composed of Mikal Flash, Bouille Bordelaise, Acrobat MZ, Polyram and Curzate Manox fungicides, administered on the chemically fertilized field induced the highest attack degree (AD = 8.39%). On the chemically fertilized field, the lowest attack degree (AD = 4.82%) was determined by utilization of recipe nr.1, composed of Verita, Cupritim, Consento, Bravo and Ridomil Gold Plus fungicides.