Terbacil is a selective, residual, mainly root absorbed herbicide that controls a wide range of grasses and broad leaved plants in apples, pears, lucerne and other deep rooted perennial species.
7 APPLICATION METHODS AND TIPS:
Best results when applied to moist weed free soil, free from trash and clods, and light rain follows application.
Premix the herbicide in 20 L water before adding to the tank.
Don't dispose of tank cleaning water or surplus spray near desirable plants or where their roots may be.
8 WEATHER:
Rainfast immediately.
Frost effects: No effect.
Wind: Apply when wind is away from desirable vegetation. A 100 m buffer is sufficient with a 20 kph wind with a sprayer producing medium to coarse droplets.
Inversions: Don't apply during inversions as drift damage is likely.
Temperature: No effect.
Delta T and relative humidity: No effect.
9 ADJUVANTS:
Wetting agents: None required. Use of wetting agents in lucerne may cause damage.
Spray oils: None required.
10 WATER QUALITY:
Hard water: Very hard water may overload the emulsifiers resulting in settling of the product..
Salty water: Very salty water may overload the emulsifiers resulting in settling of the product.
Colloids: Little effect.
pH: Little effect.
Tank life: 1 or 2 hours. It tends to settle in the tank and will require vigorous agitation to re suspend it.
11 COMPATIBILITY:
Trace elements.
See HerbiGuide Compatibilities button.
12 EQUIPMENT:
Continuous agitation is required to keep the product in suspension.
Boom Sprays:
Use 50 mesh screens or coarser to reduce blockages.
Use as large a nozzle size as practical to reduce blockages (eg 11003 or larger). This may require higher water rates. Pressures of 200-400 kPa are recommended and those at the higher end reduce blockage problems.
Low water rates can be used but most operators tend to use 200-500 L/ha to reduce blockages. (Label recommends 250-400 L/ha)
Rinse the sprayer immediately after finishing each job or at the end of the day with clean water to reduce blockages in following loads.
Hand Leads:
Apply in about 1000 L/ha water at 400-800 kPa. Ensure even coverage.
If using a knapsack then shake or stir it regularly.
If using a watering can apply it in about 2000 L/ha water.
13 SPRAYER DECONTAMINATION:
Rinse the sprayer immediately after finishing each job or at the end of the day with clean water to reduce blockages in following loads.
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.
Decontamination:
Remove the nozzles and screens and clean separately and allow to soak in a mixture of 500 mL chlorine (4%) bleach per 10 L water for at least 30 minutes.
Triple 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.
Rinse screens and nozzles with water and replace.
14 HERBICIDE RESISTANCE:
Some plants are resistant to terbacil and some populations may develop resistance after repeated use.
15 REPLANTING INTERVALS:
Crop
Time
Most annual crops and pastures
2 years
16 WITHHOLDING PERIODS:
Crop
Type
Time
All
Harvest
None specified
All
Grazing
None specified
17 RE-ENTRY PERIOD:
Wear protective clothing if in contact with the crop before the spray has dried.
18 PROTECTIVE CLOTHING:
Overalls, boots and washable hat. Use gloves and face shield when handling the concentrate.
19 SOIL:
May leach and cause more damage on soils with low clay or organic matter contents.
20 MODE OF ACTION:
Inhibits photosynthesis at photosystem II.
Uptake and translocation:
Absorbed mainly through the roots but there is some foliar uptake.
Physiological effects:
Reduced photosynthesis. Chlorosis. Necrosis.
Residual Life and Breakdown:
21 SELECTIVITY:
Relatively non selective. Avoid use near desirable plants and trees.
Crop tolerance:
Trees and lucerne that are young or have shallow root systems may be damaged. Application to exposed tree roots may cause damage. Drift onto tree foliage or fruit may cause damage.
Varietal sensitivities:
Effect on Clover Species:
Kills clover.
Effect on Medic Species:
Kills medics.
Effect on Lucerne:
Safe on established lucerne but damaging to seedling and shallow rooted lucerne.
Effect on Native Plants:
Low levels due to drift are not expected to have long term effects.
Most native plants with roots under treated areas are likely to be damaged.
Water flows from treated areas may cause damage.
22 DISEASE AND INSECT EFFECTS:
23 PLANT SYMPTOMS:
Yellowing of leaves followed by death.
SECONDARY EFFECTS:
24 TOXICITY:
Summary:
Generally low toxicity to mammals and other species but classified as harmful if swallowed. Toxic to algae and vegetation.
May irritate eyes, nose and throat.
Details:
Poison schedule: Not a scheduled poison.
Mammalian toxicity: Moderate.
Acute oral LD50: >1582 mg/kg (rat, product?), 934 mg/kg (female rat, terbacil), 1255 mg/kg (male rat, terbacil)[For comparison table salt is 3000 mg/kg]
Acute dermal LD50: > 5000 mg/kg (rabbit).
Skin: Not irritating. Not sensitising (Guinea pig)
Eye: Mild reversible irritant (rabbit)
Vapour inhalation: LC50 > 5.3 mg/L air (rat). Low toxicity.
Chronic oral toxicity: NOEL 50 mg/kg for two years.
Not carcinogenic, mutagenic or teratogenic in animal studies (i.e. does not cause cancer or reproductive problems).
Acceptable Daily Intake (ADI):
Other Species:
Birds: Oral LC50 >715 mg/kg for bobwhite quail. >5000 mg/kg for mallard duck. Low toxicity.
Fish: Moderate toxicity 96 hr LC50 46.2 mg/L for rainbow trout. 102.9 for bluegill sunfish.
Invertebrates: 48 hr LC50 68 mg/L for Daphnia. Moderate toxicity.
Bees: toxicity.
Arthropods: toxicity.
Earthworms:
Algae: 96 hr LC50 0.03 mg/L for green algae. Very toxic.
25 TOXICITY SYMPTOMS:
26 FIRST AID:
If SWALLOWED: Do NOT give anything by mouth to a semiconscious or unconscious patient. See a doctor.
If in EYES: Irrigate with plenty of water.
If on SKIN: Rinse with plenty of water, remove contaminated clothing, wash with soap and water.
If INHALED: Remove patient to fresh air.
Advice to doctor: Treat symptomatically.
Contact the Poisons Information Centre on 131126.
27 ENVIRONMENTAL FATE:
Do not use near desirable vegetation.
Half life in soil: Months
Half life in water: days at pH5 and 35 C.
It has an EPA classification for soil mobility that ranges from
Ground water contamination
Accumulation in milk and tissues.
pH stability:
Photolysis rate:
Hydrolysis half life:
Biodegradation rate:
28 REGISTERED CROPS:
See HerbiGuide Species Solution tab.
29 REGISTERED WEEDS:
See HerbiGuide Species Solution tab.
30 REGULATION AND LEGAL:
UN number:
CAS numbers: 5902-51-2.
Hazchem code:
NOHSC classification: Hazardous.
Land transport:
Dangerous goods class:
Sea transport:
Proper shipping name:
Class:
Packaging group:
EPG:
31 PROPERTIES:
Colour: Off white.
Odour: None.
Form: Solid powder.
Empirical formula:
Water solubility: mg/L at 25 C at pH ;
Oil solubility:
Octanol:Water ratio: LogPow = 1.91 for terbacil.
Soil organic carbon absorption coefficient (Koc):
Vapour Pressure: at 25 C.
Dissociation constant: pKa
Melting point: C.
Boiling point: C.
Molecular weight:
Bulk density: 330-380 kg/m3.
Specific gravity:
pH: 8.5-9.5 at 25 C at 20g/L of water.
Flammability: May be ignited by heat or open flame.
Flashpoint: C
Autoignition: C
Flammable limit in air: LEL 0.077 g/L.
Dust may form an explosive mixture.
Shelf Life: 3 years.
(When Stored under Ideal Conditions)
32 SPILLS:
Absorb spill with earth, sand, clay or absorbent material.
Remove top 50 cm of soil and dispose if in a chemical disposal area.
33 FIRE:
Extinguish with water spray, foam, carbon dioxide or dry agent. Use foam if possible to reduce the risk of contaminated water affecting vegetation. Contain water from the fire and prevent it entering sewers. If conditions permit then let the fire burn out to reduce the risk of contamination by fire fighting water.
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.
Du Pont (2005) Sinbar MSDS.
Du Pont (2002) Sinbar label 45835/02.
Acknowledgments:
Collated by HerbiGuide. For more information see www.herbiguide.com.au or phone 08 98444064.