Effect of plant protection treatments on the yield quantity and quality ofwheat varieties

The fungicide (Baylcton, Folicur Top, active agents: tebuconazole + tridime phone) and the insecticide (Bancol 50 WP, active agent: bensultap) were spr ayed at the usual times, when agronomically justified. In the case of the h erbicides the action mechanism was investigated when they were sprayed late r than usual, after heading. The reason for this was that the present weed situation in Hungarian crop production demands tho testing of novel solutio ns. The compounds applied were Starane 250 EC (fluroxipir), Pardner (bromox ynil) and Banvel 480 (dicamba), all at the recommended close. The following results were obtained: - The insecticide caused various degrees of yield losses in Mv 21 and Alfol d 90, but this was not observed for the fungicide. - The yield losses observed for all the varieties after herbicide applicati on, over die average of several years were not large, but the trend was qui te distinct. - The insecticide and fungicide had no significant effect on the protein an d wet gluten contents or on the farinograph index. - The herbicides caused slight, generally non-significant fluctuations in t he chemical quality traits in Mv 21, while in Alfold 90 the compounds Pardn er and Banvel resulted in a significant rise in the farinograph index in 19 97 and 1999.