PK of Strobilurin Fungicides: Which is Better, Azoxystrobin, Kresoxim-methyl, Pyraclostrobin or Trifloxystrobin?

Conclusion:

Comparison of Spectrum of Disease

Azoxystrobin: Broad-spectrum fungicide with protective, curative, eradicative, and translaminar properties. Control of powdery mildew, downy mildew, rust, spots, rice blast, white rot, fruit rot, anthracnose, early blight, late blight, sheath blight, leaf mold, white mold, blotch, scab, scald, canker, etc. in rice, wheat, barley, oats, rye, sorghum, cotton, sugarcane, tobacco, oilseed crops, vegetables, pome fruit, citrus, grape, banana, stone fruit, berries, clover, ornamentals, turf, etc

Kresoxim-methyl: Broad-spectrum fungicide with protective, curative, eradicative and long residual disease control. Control of scab, powdery mildew, downy mildew, leaf spot, white rot, rust, scald, blotch, gummy stem blight, etc. in rice, wheat, tobacco, sugar beet, vegetables, apple, pear, vines, etc. Especially for powdery mildew of most of the crops.

Pyraclostrobin: Broad-spectrum fungicide with protective, curative and translaminar properties. Control of powdery mildew, downy mildew, anthracnose, early blight, late blight, leaf blight, scab, spots, rust, gray mold, white mold, scald, blotch, melanose, banded sclerotial blight, etc. in rice, maize, wheat, barley, rye, oat, soybean, cotton, peanut, potato, cucumber, cabbage, beans, banana, apple, citrus, watermelon, sunflower, etc.

Trifloxystrobin: Broad-spectrum fungicide with mainly preventive activity. Control of powdery mildew, anthracnose, early blight, late blight, leaf spot, brown spot, rust, scab, false smut, rice blast, banded sclerotial blight, etc. in rice, maize, soybean, cotton, peanuts, sugar beet, vegetables, pome fruit, stone fruit, tropical fruit, banana, soft fruit, sunflower, ornamentals, turf, etc.

Spectrum of disease:

Azoxystrobin > Pyraclostrobin > Trifloxystrobin ≥ Kresoxim-methyl

Comparison of Inhibitory Activity

Azoxystrobin: Inhibits spore germination, mycelial growth and sporulation.

Kresoxim-methyl: Inhibits spore germination, mycelial growth.

Pyraclostrobin: Inhibits spore germination and controls mycelium and sporulation growth.

Trifloxystrobin: Inhibits spore germination, mycelial growth.

Inhibitory activity:

Pyraclostrobin > Azoxystrobin > Kresoxim-methyl ≥ Trifloxystrobin

Comparison of Systemic Property

Azoxystrobin: Systemic fungicide, absorbed by roots and leaves, translocated acropetally and by translaminar mobility.

Kresoxim-methyl: Kresoxim-methyl is absorbed through the roots and translocated in the xylem to the stems and leaves, or through leaf surfaces to the leaf tips and growing edges.

Pyraclostrobin: Pyraclostrobin is locally systemic with strong translaminar activity.

Trifloxystrobin: Trifloxystrobin is strongly adsorbed to the waxy layers of the plant. It also penetrates plant tissue and shows translaminar activity, but there is little or no transport within the vascular system of the plant.

Systemic property:

Azoxystrobin > Kresoxim-methyl > Trifloxystrobin > Pyraclostrobin

Comparison of Safety

Azoxystrobin: Good crop safety, except on some varieties of apple (e.g. McIntosh, Cox, Gala). Small seedling should also be used with caution. Do not mix with organic silicon, orange peel essential oil, EC and organophosphorus pesticides.

Kresoxim-methyl: Good crop safety, except on some cherry varieties. Do not mix with organic silicon and EC.

Pyraclostrobin: Good crop safety. Do not mix with organic silicon and EC.

Trifloxystrobin: Good crop safety, except on Concord grapes. Do not mix with organic silicon and EC.

Safety:

Pyraclostrobin > Trifloxystrobin ≥ Kresoxim-methyl > Azoxystrobin

Comparison of Long-lasting Protection

Azoxystrobin: Long-lasting protection for above 15 days.

Kresoxim-methyl: Long-lasting protection up to 10-14 days.

Pyraclostrobin: Long-lasting protection for above 15 days.

Trifloxystrobin: Long-lasting protection for above 15 days.

Long-lasting protection:

Azoxystrobin ≥ Pyraclostrobin ≥ Trifloxystrobin > Kresoxim-methyl

Comparison of Efficacy against Certain Disease

Efficacy against powdery mildew: Kresoxim-methyl ≥ Trifloxystrobin > Azoxystrobin > Pyraclostrobin

Efficacy against rice sheath blight: Azoxystrobin > Kresoxim-methyl > Trifloxystrobin > Pyraclostrobin

Efficacy against rice blast: Pyraclostrobin > Trifloxystrobin > Kresoxim-methyl > Azoxystrobin

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