Glyphosate Effects on Biological Characteristics of Weed Species Erigeron Canadensis L.

Abstract

From 268 weed biotypes identified as glyphosate resistant in the world, even 39 belong to the Erigeron canadensis L. species. Tests were conducted on two canadian horseweed biotypes, after application of a different glyphosate amounts. Glyphosate was applied at 0, 90, 180, 360, 720, 1440 g a.i.ha-1. Biotypes were classified, based on the preliminary screening test, in the group of potentially sensitive. The quantities of chlorophyll a and b, in the reference and tested biotypes, have a decreasing trend with the increase of the glyphosate application amount. The lower application amount of glyphosate (90 and 180 g a.i.ha-1) resulted in the decreased production of carotenoids. Increased production of carotenoids was measured in the implementation of the duplicate and recommended amount of glyphosate (720 and 1440 g a. i. ha-1).

Od utvrđenih 268 populacija korova rezistentnih na glifosat u svetu, 39 populacija pripada vrsti Erigeron canadensis L. Ispitivanja su izvedena na korovskim populacijama kanadske hudoljetnice, nakon primene niza količina glifosata. Glifosat je primenjen u količinama: 0, 90, 180, 360, 720, 1440 g a.s.ha-1. Na osnovu preliminarnog screening testa izvršena je klasifikacija populacija u grupu potencijalno osetljivih. Utvrđene količine hlorofila a i b, u referentnoj kao i u ispitivanoj populaciji, imaju trend smanjivanja sa povećanjem količine primene glifosata. Niže količine primene glifosata (90 i 180 g a.s.ha-1) uticale su na smanjenu produkciju karotenoida. Povećana produkcija karotenoida je izmerena pri primeni preporučene i duple količine glifosata (720 i 1440 g a.s.ha-1 ).