Pesticidi i Fitomedicina (Jan 2010)
Evaluation of Possibilities of Venturia inaequlis Control by Ecologically Acceptable Products
Abstract
Possibility of V. inaequalis control on apple variety Idared was evaluated by ecologically acceptable products such as inorganic fungicides and acidified clays. The obtained results were compared with common, chemical protection. Year 2009 was one of the unfavorable for V. inaequalis, and 2010 was extremely favorable for apple scab development. Accordingly, in 2009 intensity of infection on apple leaves and fruits in control variant was low (leaves 15,4-34,9%; fruits 0-23,8%). In 2010 infection intensity on leaves and fruits was high (leaves 81,2%; fruits 100%). During period 2009-2010, in these different environmental conditions, common chemical protection showed high efficacy (leaves 96,2-100%; fruits 97,5-100%). High efficacy level in control of V. inaequalis on leaves of 87,4-99,7% was achieved also in variants in which copper products were applied in low concentration of 0,05%. It should be noted that in the most critical period, in April and May of 2010, the treatmentswere carried out in 5-6 days interval. Copper products showed differing efficacy on fruits (48,5-90,2%). In 2009 which is considered as one of the unfavorable for V. inaequalis development, product Ulmasud B applied alone on leaves was less efficiacy (51,8-58,6%), than on fruits (87,8%). In the same year, efficacy of this product in combination with sulfur, was better (leaves 71,4-76,6%; fruits 86,6). In 2010, which was especially rainy and favourablefor spreading the disease, efficiacy of mention combination of products didn,t satisfy (leaves 44,8%; fruits 41,0%). In the system of organic production, during vegetation period, program of apple protection in control of V. inaequalis should be supplemented by use of low concentrations of copper products (0,05%) and by various alternative products of different action mechanisms,such as mineral clays, sulfur products etc. These researches should be continued.
