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.

The aim of the study carried out during 2002–2004 was to assess the effects and economic effectiveness of application of fungicides and insecticides in winter triticale crops. Its leaves were attacked by pathogenic fungi in 43.2% to 52.2% and the damage to leaf blade surfaces by cereal leaf beetle (Oulema spp.) ranged from 23.6% to 34.4%. The effectiveness of applied fungicides ranged from 44.7% to 90.8%, and that of insecticides was within 70.1% and 94.4%. The saved crops were evaluated for PLN 198 to 1 171 per ha. The cost coverage ratio ranged from 0.7 to 9.9 and the treatment profitability index ranged from 0.9 to 7.4. Cost index in percentage ranged from 0.8 to 8.5, with its average value of 4.2.

The paper present results from the studies carried out in the years 1999-2000 on the effectiveness of seed dressing of spring barley with the insecticide Gaucho 350 FS (a.i. irnidachloprid) to control frit flies, gout flies, aphids and thrips in piedmont conditions.