Osetljivost ciganskog perja (Asclepias syriaca L.) na sulkotrion

Abstract

Biotest metodom, u laboratorijskim uslovima, ispitivana je osetljivost ciganskog perja na sulkotrion. Sulkotrion je primenjen u seriji koncentracija od 0.15-0.90 kg a.s./ha sa ili bez okvašivača Dash® (1 L/ha). Biljke su rasle 14 dana, a nakon tog perioda mereni su morfološki (visina i sveža masa) i fiziološki parametri (sadržaj karotenoida i hlorofila a i b). Stepen vizuelnih oštećenja ocenjivan je 7. i 14. dana nakon tretmana. Sulkotrion je izazvao izbeljivanje listova i smanjenje sadržaja pigmenata u listovima ciganskog perja, a stepen ispoljenih promena je zavisio od koncentracije herbicida, kao i od toga da li je primenjen sa ili bez okvašivača. Veći stepen osetljivosti ispoljile su biljke koje su tretirane kombinacijom herbicida i okvašivača. Na osnovu dobijenih rezultata može se zaključiti da je cigansko perje umereno osetljivo na preporučene količine primene sulkotriona u polju.

A laboratory bioassay was conducted to investigate common milkweed response to sulcotrione. Sulcotrione was applied in concentration series of 0.15-0.90 kg a.i./ha without a surfactant and with Dash® at 1 L/ha. Plants grew for 14 days, upon which period morphological (height and fresh weight) and physiological parameters (content of carotenoids, chlorophyll a and chlorophyll b) were measured. Visual crop injury was estimated 7 and 14 days after treatment. Sulcotrione caused leaf bleaching and reduction in pigments content in common milkweed leaves and the degree of change depended on application rates and whether it was applied with or without the surfactant. Inhibition was slightly higher in plants which were treated with a combination of herbicide and surfactant. Based on the findings in this study, common milkweed showed moderate susceptibility to the recommended field rates of sulcotrione.