A post emergence, foliar absorbed, translocated herbicide for control of some grasses in some cereals.
7 APPLICATION METHODS AND TIPS:
Best results in fine weather when weeds are actively growing and rain follows a day or two after application.
Use a non ionic wetting agent. Add 1% Hasten or similar spray oil for improved control of Brome and Barley grass.
Barley Grass control increased from 30% to 70% when 1% Hasten was used compared to 0.25% wetting agent with 330 mL/ha Atlantis.
8 WEATHER:
Rainfast in 8 hours.
Frost effects:
Wind:
Inversions:
Temperature:
Delta T and relative humidity: Avoid application when Delta T is greater than
Low rainfall may increase the residual life of the herbicide in the soil and increase replanting intervals.
9 ADJUVANTS:
Wetting agents: Use a wetting agent (eg 0.25% BS1000).
Spray oils: Use a high quality spray oil (eg 1% Hasten) for hard to kill grasses such as Brome
10 WATER QUALITY:
Hard water
Colloids
pH
11 COMPATIBILITY:
Compatible with Twin Zinc. 10-20% loss of efficacy when mixed with other Zn formulations.
Not compatible with chlorpyrifos insecticides as crop damage may occur.
12 EQUIPMENT:
Boom with continuous agitation.
Use nozzles that ensure even and complete coverage.
Apply in 50-100 L/ha water or more with nozzles producing 200-300 micron VMD droplets (ASAE S572 Fine/Medium spray). If using coarser sprays then higher water volumes are likely to be needed.
A permit is required for application by aircraft.
13 SPRAYER DECONTAMINATION:
Clean up:
Remove nozzles and filters and clean separately. Triple rinse with soapy water (eg 500 mL or g of Drive, Dynamo, Omo or Surf per 100 L water) or water plus 0.25% wetting agent and run through boom. This procedure is sufficient for spraying in other cereals or non selective applications.
Decontamination:
Remove the nozzles and screens and clean separately and allow to soak in a mixture of 500 mL chlorine bleach per 10 L water for at least 30 minutes.
Rinse sprayer with soapy water (eg 500 mL or g of Drive, Dynamo, Omo or Surf per 100 L water) or water plus 0.25% wetting agent and run through boom. Drain tank and flush with clean water for a minimum of 10 minutes to remove all traces of liquid fertilisers or adjuvants containing ammonia, such as ammonium sulphate or ammonium nitrate, before adding chlorine bleach, because bleach and ammonia will react to release a toxic gas.
Fill tank with clean water and add 300 mL household chlorine (4%) bleach per 100 L water, flush through hoses and boom then stand for 15 minutes with agitation engaged, repeat. Rinse tank, hoses and boom thoroughly with clean water to remove traces of bleach.
Rinse screens and nozzles and replace.
14 HERBICIDE RESISTANCE:
Plant populations tolerant to mesosulfuron are expected to occur naturally after repeated use.
Tolerant crops can be developed.
Herbicide resistance appears to be due to plants with a less sensitive ALS enzyme.
15 REPLANTING INTERVALS:
Recropping intervals may be longer on soils with a pH>8.5 or where rainfall from application to next sowing is less than 250 mm for winter crops or less than 500 mm for summer crops.
Crop
Time
Barley
9 months
Beans; Faba
11 months
Beans; Mung
12 months
Canola
9 months
Chickpea
9 months
Clover; Subterranean
9 months where ph<8 and 250 mm rain since application 21 months where pH>8 and <250 mm rain since application
Cotton
12 months
Lentils
11 months
Lucerne
9 months where ph<8 and 250 mm rain since application 21 months where pH>8 and <250 mm rain since application
Lupin
9 months
Maize
12 months
Medic
21 months
Oats
9 months
Peas
9 months
Sorghum
12 months
Soybean
12 months
Sunflower
12 months
Triticale
9 months
Vetch
9 months
Wheat
1 day
16 WITHHOLDING PERIODS:
Crop
Type
Time
All
Harvest
8 weeks
All
Grazing
4 weeks
17 RE-ENTRY PERIOD:
Wear protective clothing if in contact with the crop before the spray has dried.
18 PROTECTIVE CLOTHING:
Cotton overalls, boots face shield or goggles, gloves.
19 SOIL:
pH: Crop damage is more likely in highly alkaline soils with a pH>8.5.
Replanting intervals are likely to be longer on high pH soils.
20 MODE OF ACTION:
Acts on the ALS enzyme in plants.
Uptake and translocation:
Absorbed mainly through the leaves with some root uptake. Pre emergence activity is usually unreliable.
Physiological effects:
Residual Life and Breakdown:
21 SELECTIVITY:
Marginal selectivity - may cause crop damage, do not overlap the spray runs or spray out corners.
Crop tolerance:
Application before the 3 leaf stage of wheat may cause crop damage.
Wheat may show yellowing and slower growth for five weeks after application.
Heavy rain following application on sandy soils may result in crop yellowing.
The addition of spray oils may caused increased discolouration and slow development of wheat. This is a transient effect under normal growing conditions and no yield loss is expected.
Crops that are physically damaged (eg by wind, sand blasting, hail or insects) are more likely to be damaged.
Slow growing crops may suffer increased herbicide damage due to the slower breakdown of herbicide in the crop. Nutritional stress, cold weather, frost, waterlogging, drought and prior herbicide damage may all contribute to increased sensitivity of the crop to mesosulfuron.
Varietal sensitivities:
Brookton and Westonia Wheat varieties are sensitive.
Effect on Clover Species:
Kills clover species.
Effect on Medic Species:
Kills medic species.
Effect on Lucerne:
Severely damages Lucerne at normal use rates.
Effect on Native Plants:
22 DISEASE AND INSECT EFFECTS:
Damage to leaves by insects may cause increased uptake and crop damage.
Root disease (eg cereal cyst nematode, Rhizoctonia, take-all) may reduce crop vigour and cause increased herbicide damage due to slower breakdown of the herbicide in the crop.
23 PLANT SYMPTOMS:
Symptoms may be very slow to develop. For example on Brome Grass it took 88 days to get to an 80% reduction in biomass.
SECONDARY EFFECTS:
24 TOXICITY:
Summary:
Low toxicity to mammals. Very toxic to aquatic plants and algae.
R38 - Irritating to skin.
R41 - Risk of serious eye damage.
R65 - Harmful: May cause lung damage if swallowed.
Details:
Poison schedule - S
Mammalian toxicity -
Acute oral LD50 - >2000 mg/kg (rats), [For comparison table salt is 3000 mg/kg]
Vapour inhalation - Irritant. LC50 - > mg/L air (rat).
Chronic oral toxicity NOEL - ppm for two years.
Not mutagenic or teratogenic in animal studies. (i.e. does not cause reproductive problems).
The formulated product contains naphthalene which has been classed as a possible human carcinogen (Class 2B)
Acceptable Daily Intake (ADI) -
Other Species -
Very toxic to algae and aquatic plants.
Birds - low toxicity. Oral LD50 >2000 mg/kg (mesosulfuron-methyl on bobwhite quail and mallard duck.
Fish - moderate toxicity. LC50 for Atlantis = 3.2 mg/L for 96 hours on rainbow trout. LC50 for mesosulfuron-methyl >100mg/L for 96 hours on rainbow trout.
Invertebrates - moderate toxicity. EC50 for Atlantis = 3.4 mg/L for 24 hours on Daphnia magna.
EC50 for mesosulfuron-methyl = >100 mg/L for 24 hours on Daphnia magna.
Algae - High toxicity. EC50 for Atlantis = 2 mg/L for 72 hours on Pseudokirchneriella subcapitata (freshwater green algae).
EC50 for mesosulfuron-methyl = 0.18 mg/L for 72 hours on Pseudokirchneriella subcapitata (freshwater green algae).
Bees - low toxicity.
Earthworms - low toxicity.
Highly toxic to the aquatic plant Lemma gibba.
Moderately toxic to freshwater green algae
25 TOXICITY SYMPTOMS:
Irritation of eye, skin and respiratory tract.
Repeated exposure may cause skin dryness.
Headache, dizziness, may have and anaesthetic effect. May cause lung damage if swallowed.
26 FIRST AID:
If SWALLOWED - Rinse mouth out with water. Do not induce vomiting. Give a glass of water if patient fully conscious. Do NOT give anything by mouth to a semiconscious or unconscious patient. See a Doctor as small amounts of solvent entering the lungs when ingested or when vomiting can cause pneumonias.
If in EYES - Irrigate with plenty of water. Severe eye irritant. See a doctor and ophthalmologist.
If on SKIN - Rinse with plenty of water, remove contaminated clothing, wash with soap and water. See a doctor if symptoms persist.
If INHALED - Remove patient to fresh air. If breathing stops apply artificial respiration and see a doctor. See a doctor.
Advice to doctor - Treat symptomatically. Consult MSDS.
Contact the Poisons Information Centre on 131126.
27 ENVIRONMENTAL FATE:
It has a half life in soil: DT50 of 44-76 days for mesosulfuron-methyl. Fairly degradable in soil.
Half life in water - days at pH5 and 35 C.
Readily to slightly degradable in water.
It has an EPA classification for soil mobility that ranges from
Ground water contamination unlikely as there is no significant leaching potential.
Replanting intervals
Accumulation in milk and tissues.
Low potential for accumulation or persistence in the environment.
28 REGISTERED CROPS:
See HerbiGuide Species Solution tab.
29 REGISTERED WEEDS:
See HerbiGuide Species Solution tab.
30 REGULATION AND LEGAL:
UN number:
CAS numbers: 208465-21-8, 135590-91-9,64742-94-5, 91-20-3.
Hazchem code: Not applicable.
NOHSC classification: Hazardous.
Land transport:
Dangerous goods class: Not a dangerous good.
Sea transport:
Proper shipping name:
Class:
Packaging group:
EPG:
Classified as a marine pollutant, P, in Europe for shipping.
31 PROPERTIES:
Empirical formula:
Water solubility at 25 C: Forms a suspension in water;
Oil solubility: Oil flowable.
Octanol:Water ratio: 1.9 at 25 C for mesosulfuron-methyl. 3.83 at 21 C for mefenpyr-diethyl.
Soil organic carbon absorption coefficient (Koc):
Vapour Pressure at 20 C: 0.006 kPa (hydrocarbon solvent).
Vapour Density > 1.00 (hydrocarbon solvent)
Dissociation constant: pKa
Melting point: C.
Boiling point: 220-290 C (solvent)
Molecular weight:
Colour: Brown liquid.
Odour: Aromatic.
Bulk density: 1.04 g/mL at 20 C
Specific gravity:
pH:
pH: 5.9 (1% solution)
Flammability: Combustible liquid, Class C1. LEL = 0.6 for solvent. UEL = 7% Vol. in air for solvent.
Flashpoint: between 61 and 150 C. >100 C for Setaflash closed cup.
Autoignition: 455 C
Produces toxic fumes when burnt.
Avoid sources of ignition, extreme heat or exposure to strong oxidising agents.
Shelf Life: years.
(When Stored under Ideal Conditions)
32 SPILLS:
Extinguish possible sources of ignition.
Absorb spill with earth, sand, clay or absorbent material.
Ventilate area after cleanup.
33 FIRE:
Extinguish with water spray, foam, carbon dioxide or dry agent.
Toxic fumes may be released in fire. Wear breathing apparatus or avoid smoke.
34 COMMENTS:
35 REFERENCES:
Ashton, F.M. and Crafts, A.S. (1981) Mode of Action of Herbicides. (Wiley-Interscience publication).
Kearney, P.C. and Kaufman, D.D. (1976). Herbicides. Chemistry, degradation and mode of action. Vol 1 & 2.
Bayer (2003) Label 54252/0503 and MSDS
Bayer (2006) Label 54252/0706 and MSDS
Acknowledgments:
Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.