EFFICIENCY OF THE CHEMICAL TREATMENT AGAINST THE EUROPEAN CORN BORER IN SEED MAIZE PRODUCTION

Cilj istraživanja bio je utvrditi učinkovitost kemijskoga tretiranja protiv ličinki kukuruznoga moljca (Ostrinia nubilalis Hübner). Pokus je postavljen u 2010. i 2011. godini u Čepinu (istočna Hrvatska). U pokus su bila uključena dva hibrida sjemenskoga kukuruza FAO grupe 400: PR37N01 i PR37F73. Tijekom vegetacije pratila se biologija štetnika, kako bi se utvrdila brojnost populacije i stadij razvoja gusjenice te odredio optimalan rok primjene insekticida. Kukuruz je tretiran kemijskim pripravcima djelatne tvari dimetoat, uz dodavanje sumpora. Pred kraj vegetacije, disekcijom stabljike kukuruza, utvrđena je dužina oštećenja stabljike, broj gusjenica u stabljici i klipu te je izračunat prinos zrna kukuruza. Statističkom obradom podataka utvrđeno je kako su godina, tretman i hibrid značajno utjecali na pojavu kukuruznoga moljca te je opravdana primjena kemijskih pripravaka, uz obvezno praćenje biologije štetnika.The aim of this study was to determine the effectiveness of a chemical treatment against larvae of the European corn borer (Ostrinia nubilalis Hubner). The experiment was set up in 2010 and 2011 in Čepin (eastern Croatia in two treatments: control treatment and insecticide treatment). The trial involved two hybrids of FAO group 400: PR37N01 and PR37F73. Biology of pests was monitored in order to determine population size and larvae development stage as well as the optimal time of insecticide application. After determination of thresholds, maize was treated with chemical formulations of active substance dimethoate. Towards the end of vegetation, length of stem damage, number of larvae in maize stalk and ear as well as grain yield were recorded by dissection of maize stalks. Statistical analysis shows that year, hybrid and chemical treatment significantly influenced the incidence of this pest and justified the use of chemical preparations with mandatory monitoring biology of this pest