Uticaj hibrida kukuruza i primenjenih insekticida na napad Ostrinia nubilalis HBN.

Abstract

Ostrinia nubilalis Hbn. je štetočina kukuruza koja u pojedinim godišnjim dobima može naneti veliku štetu biljkama. Cilj ovog rada je proučavanje otpornosti odnosno podložnosti hibrida napadu kukuruznog plamenca i efekata različitih doza insekticida i vremena primene u zaštiti od ove štetočine na biljkama kukuruza, ali prvenstveno uticaj hibrida na intenzitet napada. Šest hibrida kukuruza različitih grupa zrenja (ZP 427, ZP 434, ZP 555, ZP 600, ZP 606 i ZP 666) korišćeno je za proučavanje dejstva napada Ostrinia nubilalis Hbn., na kontrolnu varijantu T1 bez primene insekticida i na varijantu tretiranu sa dva insekticida Fobos EC (bifentrin - 200 ml ha-1) i kombinacijom Match 050 EC i Nurelle D (lufenuron 50 g l-1 i hlorpirifos 500 g l-1 + cipermetrin 50 g l-1), 0.75 l ha-1) u dva termina (u prvoj generaciji za vreme leta insekata T2 i T3 i u drugoj generaciji za vreme leta insekata T4 i T5) u tri ponavljanja. Rezultati su pokazali najveći intenzitet Ostrinia nubilalis Hbn. napad i stepen oštećenja na kontrolnoj varijanti i značajne razlike između tretmana za ispitivane parametre. Posmatrajući sve hibride i tretmane, nije utvrđena statistička značajnost između šest ispitivanih hibrida kukuruza različitih grupa zrelosti. U kontrolnoj varijanti najveći napad (oštećenje) je bio na biljkama kod hibrida ZP 666 (94,28%) i ZP 606 (93,90%), a među varijantama primenjenih insekticida najveća šteta je konstatovana u tretmanu T5 sa primenjena kombinacija Match + Nurelle u hibridu ZP 555 i iznosila je 92,02%. Na tretmanu T1-kontrolna varijanta bez insekticida, najmanji napad sa Ostrinia nubilalis Hbn. je konstatovan kod hibrida ZP 434 (od 88,76%), a među varijantama primenjenih insekticida najmanji napad je konstatovan kod varijante T2 sa primenjenim Fobos kod prve generacije insekata u hibridu ZP 434 i iznosio je 77,12%. Napad Ostrinia nubilalis Hbn. i varijacija prosečne mase klipa kukuruza varirala je u zavisnosti od hibrida kukuruza i vremena primene insekticida.

Ostrinia nubilalis Hbn. is a corn pest that can do great damage to plants in some seasons. The aim of this paper is to study the resistance / susceptibility of hybrids to the attack of European corn borer and the effects of different doses of insecticides and time of application in protection against pests on maize plants, but primarily the influence of hybrids on attack intensity. The six maize hybrids of different maturation groups (ZP 427, ZP 434, ZP 555, ZP 600, ZP 606 and ZP 666) used for study effect of attack of Ostrinia nubillalis Hbn., on control variant T1 without application of insecticide and on variant treated with two insecticides Fobos EC (bifentrin - 200 ml ha-1 ) and combination of Match 050 EC and Nurelle D (lufenuron 50 g l -1 and hlorpirifos 500 g l -1 + cipermetrin 50 g l -1 ), 0.75 l ha-1 ) in two terms (in the first generation of insect flying T2 and T3 and in the second generation of insect flying T4 and T5) in three replication. The results showed the highest intensity of Ostrinia nubilalis Hbn. attack and degree of damages on control variant and significant differences between treatments for investigated parameters. Observing all hybrids and treatments, there was no statistical significance between the six examined maize hybrids of different maturity groups. In the control variant, the greatest attack (damage) was in plants, namely in the hybrid ZP 666 (94.28%) and ZP 606 (93.90%) and among the variants of applied insecticides, the greatest damage was found in the treatment T5 with the applied combination of Match + Nurelle in hybrid ZP 555 and was 92.02%. On treatment T1-control variant without insecticides, the smallest attack with Ostrinia nubilalis Hbn. was found in the hybrid ZP 434 (from 88.76%) and among the variants of applied insecticides, the smallest attack was found on variant T2 with applied Phobos in the first generation of insect in hybrid ZP 434 and amounted to 77.12%. The attack of Ostrinia nubilalis Hbn. and variation of average mass of maize cob varied in dependence of maze of hybrids and variant of insecticides application.