Influence of soil applied insecticide terbufos on selectivity of sulfonylurea herbicides towards maize

Abstract

A three-year field trial was set up to study the effect of the soil insecticide terbufos on the selectivity of primisulfuron-methyl, rimsulfuron, and nicosulfuron towards three maize hybrids. The use of primisulfuron-methyl, rimsulfuron, and nicosulfuron after the application of the soil insecticide terbufos resulted in significant plant damage and a decrease of the above-ground plant weight and height, plant height and grain yield in three maize hybrids. The most susceptible hybrid was NS 420, while NS 375 and NS 640 exhibited approximately the same levels of tolerance towards the interaction between terbufos and the sulfonylureas. The highest levels of phytotoxicity resulting from the terbufos by sulfonylurea interaction were observed in the treatments with the most precipitation after the application of the insecticide and just before that of the herbicide.

U trogodišnjim poljskim ogledima, ispitivan je uticaj zemljišnog insekticida terbufos na selektivnost primisulfuron-metila, rimsulfurona i nikosulfurona prema tri hibrida kukuruza. Primena primisulfuron-metila, rimsulfurona i nikosulfurona posle primene zemljišnog insekticida terbufos, prouzrokovala je jaču fitotoksičnost, smanjenje sveže mase nadzemnog dela biljaka, visine biljaka i prinos zrna tri hibrida kukuruza. Najosetljiviji hibrid bio je NS 420, dok su NS 375 i NS 640 ispoljili približan nivo tolerantnosti na interakciju ispitivanih sulfonilurea i terbufosa. Najveći intenzitet fitotoksičnosti usled interakcije bio je u ogledima sa više padavina posle primene insekticida, a neposredno pre primene herbicida.