Abstract
In the years 1999-2001 studies were conducted with the aim w evaluate biological, farm and economic effectiveness of plant protection products used in controlling fungal diseases and pests in spring barley. The following chemical compounds were tested in the experiments: Spartak Alpha 380 EC, Alert 375 SC, Amis tar 250 SC, Juwel 250 SC, Karate 025 EC, Tango 500 SC. The infection of barley leaf area on non- protected plots amounted, on the average, w 52.0%, whereas che damage caused by leaf beetle larvae averaged 25.0%. The tested fungicides exhibited a high efficacy from 31.6% w 92.3%, while the effectiveness of the applied insecticide constituted, on average, 91.6%. The use of the above plant protection products contributed w the increase of barley grain yield from 3.2 dt/ha to 15.9 de/ha. The defrayal index was, on average, 1.8 and the index of chemical treatment profitability constituted 5.3.
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