Yellow nutsedge (Cyperus esculentus L. ) control with herbicides: the role of tuberization

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:7169644

Pereira, W

Trials were carried out under greenhouse, growth chamber, laboratory, outdoor pot, and field conditions to characterize stages of yellow nutsedge tuberization and to investigate the influence of herbicides. The effects of herbicides on tuberization and phytotoxicity at several growth stages, as well as on sprouting, growth characteristics, and survival of new tubers were determined. Tuberization was a continuous process, but was modulated by plant age and environmental conditions. The growth stage that included the time of first tuber initiation was the best for applying glyphosate (N-(phosphonomethyl)glycine) and oxyfluorfen (2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluromethyl)benzene). Plant-age and length of period after spraying influenced glyphosate and oxyfluorfen absorption and translocation. Addition of unlabelled oxyfluorfen as a tank mixture can glyphosate increased absorption of /sup 14/C-glyphosate to 27% after 1 day and 46% after 8 days and increased translocation into other plant parts. Timing of postemergence herbicide applications relative to tuberization is crucial for overall control of yellow nutsedge. When soil applied herbicides were compared in the field, consecutive applications of dichlobenil (2,6-dichlorobenzonitrile) and metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide) for two years provided the best control of nutsedge.

• Research Organization: Oregon State Univ., Corvallis (USA)
• OSTI ID: 7169644
• Country of Publication: United States
• Language: English

Related Subjects

550201 -- Biochemistry-- Tracer Techniques
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AGE DEPENDENCE
BENCH-SCALE EXPERIMENTS
BIOCHEMISTRY
BIOLOGICAL EFFECTS
CARBON 14 COMPOUNDS
CHEMISTRY
FIELD TESTS
FLUORINE COMPOUNDS
GROWTH
HALOGEN COMPOUNDS
HERBICIDES
LABELLED COMPOUNDS
OXYFLUORIDES
OXYGEN COMPOUNDS
PESTICIDES
PLANT GROWTH
TESTING
TRANSLOCATION
TUBERS
UPTAKE