Diflufenican plus MCPA is an early post emergence, selective herbicide for control of a wide range of broadleaved plants in cereals and pastures. Both active ingredients are absorbed through the leaves and translocated throughout the plant. Diflufenican is also absorbed through the roots and provides short term residual control of some weeds close to emergence.
7 APPLICATION METHODS AND TIPS:
Best results in fine weather when soil is moist and rain a few days later.
Young actively growing weeds are most susceptible.
Usually applied by boom spray with water as a carrier.
Avoid drift onto hormone sensitive plants as these products contain MCPA.
Don't apply if frost is imminent and allow a 5-7 days for plant growth to recover after frosts.
If residual control of weeds is required use higher rates or add more diflufenican.
Rainfast in 4 hours.
Frost effects: Poorer results in frosty weather. This may include poorer weed control and increased crop damage or more persistant symptoms. Frost a day or two after spraying generally OK. Allow 5-7 days for plants to recover from last frost before spraying.
Wind: Spray when the wind is away from desireable hormone sensitive plants.
Inversions: Avoid spraying in inversion conditions if sensitive broad-leaved plants are within two kilometres.
Delta T and relative humidity: Avoid application when Delta T is greater than
Wetting agents: Generally not required. Addition may cause more crop symptoms.
Spray oils: Generally not required. Addition may cause more crop symptoms.
10 WATER QUALITY:
Hard water: May cause product to drop out of solution. Jar test before use.
Salty water: Storage time in spray tank may be less than 4 hours with salty water. Spray immediately after mixing.
Colloids: No specific effect.
pH: Don't use alkaline water or add an acidifier. Acidic water is OK.
Tank life: Apply within a few hours of mixing. Prolonged exposure to cold temperatures may result in the product settling out in the tank.
Trace elements may drop the product out of solution. Jar test first.
Efficacy of diclofop-methyl is generally reduced by 5 - 10 % when mixed with diflufenican plus MCPA. Do NOT use more than 800ml/ha of diflufenican plus MCPA when mixing with diclofop-methyl to minimize antagonism.
Group C soil residual herbicides such as simazine, atrazine and diuron can sensitise plants to diflufenican which can lead to better weed control but may also result in more damage to broad-leaved pasture species like clover.See HerbiGuide Compatibilities button.
Water volume: 30-1000 L/ha for boom sprays (70-100 L/ha is preferred). Use finer droplets with low water volumes to keep adequate coverage.
Flat fan nozzles at 150 - 400 kPa (21.5 - 60 psi) are commonly used (e.g. 110-01 to 110-03).
Water volume: 500-1000 L/ha.
Water volume: 30 L/ha or more. Fine droplets are required to get adequate coverage on small weeds but this increases the level of drift.
13 SPRAYER DECONTAMINATION:
A boom cleaner is recommended to clean the boom at the end of diflufenican plus MCPA spraying to reduce the effects of solvents on rubber components in sprayers.
Remove filters and nozzles and manually clean separately. Rinse with boom cleaner and run through boom. Rinse with water.
Remove filters and nozzles and manually clean then soak in 500 mL household ammonia in 10 L water for 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. Fill with 1% solution of ammonia and allow to stand for several hours. Triple rinse with water. Or use a commercial spray tank and equipment cleaner.
Rinse nozzles and filters in water and replace.
Don't use chlorine based cleaners.
14 HERBICIDE RESISTANCE:
Some populations of plants may be resistant or develop resistance after many applications.
15 REPLANTING INTERVALS:
Cultivate to dissipate herbicide before sowing
16 WITHHOLDING PERIODS:
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 or goggles when handling the concentrate.
Best results when applied to moist soil.
More crop damage may occur under waterlogged conditions.
Poorer weed control when soil is dry. Very poor weed control when plants are drought stressed.
20 MODE OF ACTION:
The diflufenican component inhibits carotenoid synthesis resulting in white or bleached patches on green leaves.
The MCPA component disrupts plant cell growth and elongation resulting in distorted plant growth.
Uptake and translocation:
Diflufenican component is absorbed by roots and shoots and translocated throughout the plant.
MCPA component is absorbed through the leaves and translocated throughout the plant.
Residual Life and Breakdown:
Diflufenican component will provide about a months useful residual control of Brassica weeds like Wild Radish, Turnips, Mustards and Volunteer Canolas. Poor residual control can be expected under dry conditions, on non wetting soils, on high organic matter soils, where there has been poor coverage of the soil surface or where cultivation (or soil disturbance) after application.
The MCPA component has no useful residual activity.
Provides suppression of Dock, Paterson's Curse, Erodium, Doublegee and Chickweed in pastures if applied early in the season. Grazing 7 days after spraying generally improves control in pastures but high levels of Paterson's Curse, Capeweed or Variegated Thistle may cause stock poisoning.
Control of transplante or stressed is usually poor.
Control of plants regenerating from roostocks, rhizomes and bulbs is generally poor.
Transient crop yellowing may occur which rarely results in yield loss unless other factors are also stressing the crop. Rates above 800 mL/ha applied before the 5 leaf stage of cereals may cause unacceptable damage.
Phalaris and Cocksfoot may have reduced production after application.
The tolerance of clover species can be variable. Winter production is often reduced after application. Application before the 8 leaf stage of clovers helps reduce this effect.
Group C soil residual herbicides such as simazine, atrazine and diuron that are in the soil from previous applications can sensitise plants to diflufenican which may result in more damage to broad-leaved pasture species like clover but also makes many broadleaf weeds more sensitive.
Barley and Kulin Wheat may be damaged by label rates if applied before the 5 leaf stage.
Effect on Clover Species:
Arrowleaf (Zulu), Balansa (Paradana), Berseem (Sacramonte) and Persian (Kymabro, Lupers, Mural), Subterranean (Daliak, Dalkeith, Denmark, Esperance, Geraldotn, Gouldburn, Karridale, Larissa, Leura, Mount Barker, Nungarin, Rosedale, SeatonPark, Trikkala, Woogenellup) and White (Haifa) clovers have tolerated diflufenican plus MCPA well at rates up to 600 mL/ha. Clover seed production may be reduced in Woogenellup Subterranean Clover.
Rose and Strawberry clovers are usually damaged.
Damage to Clovers appears to be less when applied from the third to eighth trifoliate leaf stage.
Effect on Medic Species:
Medics are sensitive.
Effect on Lucerne:
Established Lucerne under cereals will generally survive applications. Lucerne has marginal tolerance.
Effect on Native Plants:
Most established native plants will tolerate low rates of diflufenican plus MCPA.
22 DISEASE AND INSECT EFFECTS:
Crops stressed by disease or insect attack are more likely to be damaged.
23 PLANT SYMPTOMS:
Symptoms usually take 5-10 days to appear. They include bleaching and striping of leaves often with a yellow spot surrounded by green leaf initially, distorted growth, cupping of leaves, curling of soft stems, stem splitting
Residual diflufenican in the soil may cause cotlyledons of plants emerging after spraying to be yellowed or have a yellow eye-spot.
Harmful by inhalation, in contact with skin and if swallowed.
Irriating to skin
Risk of serious eye damage.
The MCPA ester form in these products is generally less toxic than MCPA amine to mammals but more toxic to fish.
Dangerous to fish.
Poison schedule: S5
Acute oral LD50: 1580 mg/kg (rat), [For comparison table salt is 3000 mg/kg]. Harmful if swallowed.
Acute dermal LD50: >2040 mg/kg (rabbit).
Skin: Slightly to moderately irritating (rabbit). Will irritate skin. Harmful in contact with skin. Repeated exposure to the solvent may cause skin dryness and cracking.
A similar product was a skin sensitiser in Guinea pigs.
Eye: Slightly irritating (rabbit). Will dmage eyes.
Vapour inhalation: Diflufenican LC50 4 hour >5.12 mg/L air (rat). MCPA-2-ethyl hexyl ester LC50 4 hour >5.11 mg/L (rat). Harmful if inhaled. May irritate mucous membranes of the nose and throat. Vapours of the solvent may cause drowsiness and dizziness.
Chronic oral toxicity: NOEL mg/kg for two years.
Diflufenican and MCPA are not carcinogenic, mutagenic or teratogenic in animal studies. N-methl-2-pyrrolidone showed a developmental toxic effect at doses that were maternally toxic.
Acceptable Daily Intake (ADI):
MCPA 2-ethyl hexyl ester
Birds: toxicity. LC50 96 hour = 97 mg/kg for Bobwhite quail for MCPA technical.
Invertebrates: toxicity. EC50 48 hour >0.24 mg/L for Daphnia magna.
Bees: Low toxicity.
Earthworms: Low toxicity.
Algae: EC50 > 0.00025 mg/L for Senedesmus subspicatus.
25 TOXICITY SYMPTOMS:
For MCPA - headcache, vomiting, diarrhoea, muscular twitching, lethargy, liver and kidney function disturbance. Large ingestions may cause stupor, central nervous system depression, coma and respiratory failure.
Solvents may cause broncopneumonia or pulmonary oedema if inhaled or if vomit is inhaled.
26 FIRST AID:
If SWALLOWED: Do NOT induce vomiting. Give a galss of water. Keep patient at rest. Seek medical advice. Do NOT give anything by mouth to a semiconscious or unconscious patient.
If in EYES: Irrigate with plenty of water immediately and see a Doctor or opthamologist urgently as serious eye damage can occur.
If on SKIN: Rinse with plenty of water, remove contaminated clothing, wash with soap and water.
If INHALED: Remove patient to fresh air. If breathing stops apply artificial respiration and seek medical advice.
Advice to doctor: Treat symptomatically. Will damage eyes and may irritate skin.
Product contains hydrocarbon solvent and liquid aspirated into lungs may cause broncopneumonia or pulmonary oedema.
Contact the Poisons Information Centre on 131126.
27 ENVIRONMENTAL FATE:
Half life in soil: DT50 for MCPA in soil <7 days after initial lag phase. DT50 for diflufenican is 15-30 depnding on soil type. Solvents are readily biodegradable.
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.
Hydrolysis half life:
28 REGISTERED CROPS:
See HerbiGuide Species Solution tab.
29 REGISTERED WEEDS:
See HerbiGuide Species Solution tab.
30 REGULATION AND LEGAL:
UN number: 3082.
CAS numbers: MCPA ethyl hexyl ester 29450-45-1, Diflufenican 83164-33-4, Hydrocarbon solvent 90438-79-2, N-methyl-2-pyrrolidone 872-50-4. Non ionic emulsifiers.
NOHSC classification: Hazardous.
Dangerous goods class: Not classed as a dangerous good.