Effect of surfactant application on the efficacy of tribenuron-methyl for weed control in wheat

Abstract

During 2002 the efficacy of tribenuron-methyl for weed control in wheat was tested, and the results are shown below. The application of 7.5 g a.i/ha was shown to be efficient in controling Bilderdykia convolvulus, Stellaria media Brassica nigra, Sinapis arvensis and Lamium purpureum. The application of tribenuron-methyl at the same rate showed favorable results (75-90%) in controlling Chenopodium album, and poor results ( lt 75%) in controlling Cirsium arvense, Consolida regalis, Galium aparine, Polygonum aviculare Veronica hederifolia and Fumaria officinalis. Increasing the active ingredient rates, especially if surfactants are added, tends to increase the efficacy in controlling these more resistant weeds. All treatments exhibited poor control of Fumaria officinalis and Veronica hederifolia, and therefore the application of tribenuron-methyl in the mixture with a compound which would broaden the spectrum of activity on the more resistant weeds provided their abundance in wheat crop has been registered, is recommendable.

Tokom 2002. godine proveravana je efikasnost tribenuron-metila za suzbijanje korova u pšenici i u ovom radu su prikazani rezultati tih ispitivanja. Primenom 7.5 g a.m/ha postiže se dobra efikasnost u suzbijanju: Bilderdykia convolvulus, Stellaria media, Brassica nigra, Sinapis arvensis i Lamium purpureum. Tribenuron-metil, u istoj količini primene, zadovoljavajuće suzbija (75-90 %) Chenopodium album, a slabo ( lt 75 %) Cirsium arvense Consolida regalis, Galium aparine, Polygonum aviculare, Veronica hederifolia i Fumaria officinalis. Povećavanjem količine primene, a pogotovo uz dodatak okvašivača, povećava se i efikasnost u suzbijanju ovih otpornijih korova. Slaba efikasnost ispoljena je u svim varijantama ogleda u suzbijaju Fumaria officinalis i Veronica hederifolia, tako da se može preporučiti primena tribenuron-metila u kombinaciji sa jedinjenjima koja će proširiti spektar delovanja i na ove otpornije korove, ukoliko su brojnije zastupljeni u usevu pšenice.