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Chemical Identification
Common Name
Pyraclostrobin
中文通用名
吡唑醚菌酯
IUPAC
methyl N-{2-[1-(4-chlorophenyl)-1H-pyrazol-3-yloxymethyl]phenyl}(N-methoxy) carbamate
CAS
methyl [2-[[[1-(4-chlorophenyl)-1H-pyrazol-3-yl]oxy]methyl]phenyl]methoxycarbamate
CAS No.
175013-18-0
Molecular Formula
C19H18ClN3O4
Molecular Structure
Category
Activity
Pyraclostrobin (BAS 500 F) is a broad-spectrum fungicide, controlling major plant pathogens from the ascomycete, basidiomycete, deuteromycete and oomycete classes of fungi. The product has protective, curative, eradicative, translaminar and locosystemic properties.

Pyraclostrobin is taken up rapidly by the plant and is largely retained by the waxes in the leaf cuticle. It demonstrates good translaminar movement through the leaf, resulting in disease control on both leaf surfaces. Acropetal and basipetal transport in leaves and vapour phase activity is very limited. Microscopic studies revealed that preventative treatments at concentrations of less than 0.1 ppm inhibit spore germination of a wide range of pathogens. The rapid uptake by the leaf and subsequent retention in the cuticular waxes means that applications are rainfast within 2 hours.

After a curative or, against some diseases, an eradicative treatment, mycelium development is inhibited. Despite this post infection activity, the recommended use of pyraclostrobin will be preventative in accordance with the Fungicide Resistance Action Committee guidelines. The product is also reported to have beneficial effects on plant growth and yield and these are attributed to enhanced nitrate reductase activity leading to improved nitrogen assimilation during the stages of rapid crop growth (GS 31-39) and decreased ethylene production resulting in delayed senescence.

Pyraclostrobin offers good to excellent control of most cereal leaf and ear diseases. The product provides better curative activity than BASF's Opus (epoxiconazole) against wheat leaf blotch (Septoria tritici) and is also effective against wheat stripe rust (Puccinia striiformis), brown rust (P recondita), leaf blotch (Rhyncosporium secalis) and net blotch (Pyrenophora teres). The notable preventative activity against wheat leaf blotch is due to a high intrinsic activity on pycnidiospore germination and penetration.

In vines, pyraclostrobin provides effective control of downy mildew (Plasmopara viticola) on the leaves and berries; the control is due to activity against several developmental stages of the pathogen. The zoospores are particularly sensitive and are lysed by contact with the fungicide. The product also controls Oidium, black rot (Guignardia bidwellii) and rot-brenner (Pseudopezicula tracheiphila) in vines.

The application interval ranges from 7 28 days depending on crop and target disease. Leaf diseases on cereals are controlled by applications made between Zadoks growth stages 39 and 45.

Cabrio is reported to provide excellent control against early blight on tomatoes, and against more diseases of cucurbits than any other product, whilst Headline alone controls nearly 50 diseases. Headline provides 'unprecedented' control of Ascochyta spp and anthracnose in pulse crops and is the only product, according to BASF, that combines superior control of early blight in potatoes with a reliable control of late blight.
CropUse
CropUses:
bananas, barley, berries, bulb crops, carrots, celery, cereals, cherries, chickpeas, oranges, grape fruits, lemons, lime, tangerine, tangelos, coffee, cucurbits, dry beans, filberts, garlic, grapes, grass seeds, leeks, lentils, onions, peanuts, peas, pecans, pistachios, potatoes, root vegetables, rye, spinach, stone fruits, strawberries, sugar beets, sweet potatoes, tomatoes, tree nuts, triticale, tuberous vegetables, corm vegetables, turf, wheat, yams

Cabrio

554 - 450 g/ha

Headline

0.4 - 1.1 L/ha

Food crops

50 - 250 g ai/ha

Turf

280 - 560 g ai/ha

Disease Spectrum
ascomycete, basidiomycete, deuteromycete and oomycete classes of fungi.
wheat leaf blotch (Septoria tritici) and is also effective against wheat stripe rust (Puccinia striiformis), brown rust (P recondita), leaf blotch (Rhyncosporium secalis) and net blotch (Pyrenophora teres). downy mildew (Plasmopara viticola) on the leaves and berries,  Oidium, black rot (Guignardia bidwellii) and rot-brenner (Pseudopezicula tracheiphila) in vines
Formulation
EO = Emulsion ,water in oil
GR = Granule
WG = Water dispersible granules
WP = Wettable powder
Premix
Pyraclostrobin+boscalid
Pyraclostrobin+epoxiconazole
Pyraclostrobin+fluxapyroxad
Pyraclostrobin+metalaxyl+triticonazole
Pyraclostrobin+metconazole
Pyraclostrobin+metiram
Pyraclostrobin+thiophanate-methyl
Pyraclostrobin+metalaxyl
Pyraclostrobin+dimethomorph
Pyraclostrobin+Hexaconazole
Pyraclostrobin+Fenoxanil
Pyraclostrobin+Tebuconazole
pyraclostrobin+Bacillus subtilis MBI 600
fluxapyroxad+pyraclostrobin+tetraconazole
Thifluzamide+Pyraclostrobin
Dithianon+Pyraclostrobin
Pyraclostrobin+metalaxyl+fluxapyroxad
Pyraclostrobin + Cyazofamid
Pyraclostrobin+Prochloraz
Pyraclostrobin+Flusilazole
Pyraclostrobin+Carboxin+Thiamethoxam
Pyraclostrobin+Carbendazim
Pyraclostrobin+Iprodione
Pyraclostrobin+Cymoxanil
Pyraclostrobin+Thiram
Pyraclostrobin+Fludioxonil+Clothianidin
Pyraclostrobin+Albendazole
Famoxadone+Pyraclostrobin
Pyraclostrobin+Metalaxyl-M
Pyraclostrobin+Mancozeb
Iminoctadine tris(albesilate)+Pyraclostrobin
Pyraclostrobin+Zinc thiazole
Polyoxin B+Pyraclostrobin
Pyrisoxazole+Pyraclostrobin
Tetraconazole+Pyraclostrobin
Copper Abietate+Pyraclostrobin
Pyraclostrobin+Cuppric nonyl phenolsulfonate
Pyraclostrobin+Oxine-copper
Pyraclostrobin+Captan
Pyraclostrobin+Triticonazole
Pyraclostrobin+Ethirimol
Pyraclostrobin+Isoprothiolane
Emulsifiable concentrate, water dispersible granule
Physical Properties
Molecular weight:387.8; Physical form:White or light beige crystalline solid. Melting point:63.7-65.2 °C; Vapour pressure:2.6 × 10-5 mPa (20 °C); Henry constant:5.3 × 10-6 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 3.99 (22 °C); Solubility:In water 1.9 mg/l (20 °C).; Stability:Stable >30 d (pH 5-7, 25 °C).
Toxicology
Cabrio: (Rat): Oral LD50 >2000 mg/kg. Dermal LD50 >2000 mg/kg. Inhalation LC50 4.7 mg/l. Headline*: (Rat): Oral LD50 >500 mg/kg (male), 260 mg/kg (female). Dermal LD50 >4000 mg/kg. Inhalation LC50 3.51 mg/l.
Environmental Profile
Ecotoxicology:

Bobwhite quail

LD50 >2,000 mg/kg

Rainbow trout

LC50 0.006 mg/L

Bee [oral]

LD50 73.1 μg/bee

Daphnia magna[48 h]

EC50 0.016 mg/L

Bee [contact]

LD50 >100 μg/bee

Green alga [72h static]

EC50 0.843 mg/L

Earthworm

LC50 5.66 mg/kg dry soil

Fate in soil:
Field soil dissipation DT50 = 2-37 days.
Koc = 6,000-16,000 ml/g.
The data above indicate that the risk of contamination of groundwater will be low.

Fate in aquatic systems:
Aqueous hydrolysis; DT50 = >30 days. Stable at pH 5-7 at 25°C
Aqueous photolysis; DT50 = <2 h

Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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BASF Canada announces first truly systemic seed treatment for use on pulses and flax

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