Chemical protection of spring barley against diseases and pests and its influence on grain yield and economic indices
2002
Kaniuczak, Z. (Institute of Plant Protection in Poznan, Rzeszow (Poland). Regional Experimental Station)
In the years 1999-01 studies were conducted with the aim to 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: Sportak Alpha 380 EC, Alert 375 SC, Amistar 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, to 52.0 percent, whereas the damage caused by leaf beetle larvae averaged 25.0. The tested fungicides exhibited a high efficacy from 31.6 to 92.3 percent, while the effectiveness of the applied insecticide constituted, on average, 91.6 percent. The use of the above plant protection products contributed to the increase of barley grain yield from 3.2 dt/ha to 15.9 dt/ha. The defrayal index was, on average, 1.8 and the index of chemical treatment profitability constituted 5.3
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