In-depth Demand Report | Disassembling Yard Fungicide

Bactericides, also known as biocides, bactericidal algaecides, microbicides, etc., generally refer to chemicals that effectively control or kill microorganisms in the water system - bacteria, fungi and algae. Mainly divided into agricultural fungicides and industrial fungicides.Agricultural fungicideIt is a class of pesticides used to control plant diseases caused by various pathogenic microorganisms, and generally refers to fungicides. However, internationally, it is generally a generic term for agents that control various pathogenic microorganisms. With the development of fungicides, sub-classes such as bactericides, viricides and algicides are distinguished.Industrial fungicideAccording to the sterilization mechanism, it can be divided into two categories: oxidative bactericide and non-oxidizing bactericide. Oxidizing bactericides are usually strong oxidants, which are mainly sterilized by oxidation with metabolic enzymes in bacteria. Commonly used oxidizing biocides are chlorine gas, chlorine dioxide, bromine, ozone, hydrogen peroxide and the like. The non-oxidizing bactericide acts on a special part of the microorganism in the form of a toxic agent, thereby destroying the cells or living bodies of the microorganism to achieve a bactericidal effect. Common non-oxidizing bactericides are chlorophenols, isothiazolinones, quaternary ammonium salts.The fungicides are classified according to the source. Except that the agricultural antibiotics are biologically-derived fungicides, the main varieties are chemical synthetic fungicides, and the fungicides are a kind of medicaments for controlling plant diseases. All agents that have a killing effect on the pathogen or inhibit growth, but do not hinder the normal growth of the plant, are collectively referred to as fungicides. The fungicide can be classified according to the mode of action, the source of the raw materials and the chemical composition.

Inorganic fungicideSuch as sulfur powder, stone sulfur mixture, copper sulfate, mercuric mercury, lime Bordeaux liquid, copper hydroxide, cuprous oxide and the like.Organic sulfur fungicideSuch as dexamethasone, rust sodium, thiram, daisen zinc, mancozeb, thiram and so on.Organic phosphorus, arsenic fungicideSuch as rice glutinous rice, gram sputum, ethyl aluminum phosphate, methyl chlorhexidine, chlorhexidine, rice foot green and so on.Substituted benzene fungicideSuch as methyl thiophanate, chlorothalonil, diclosan, pentachloronitrobenzene and the like.Azole fungicideSuch as powder rust, carbendazim, carbendazim, benomyl, thiabendazole and so on.Antibiotic fungicideJinggangmycin, polymycin, chunleimycin, agricultural streptomycin, antimycomycin 120, and the like.Compound fungicideSuch as dysentery, double-effect spirit, anthrax fumei, anti-virus 矾M8, nail cream copper, DT fungicide, metalaxyl · manganese zinc, seeding spirit · manganese zinc, methyl thiophanate · manganese zinc, widely sterilized Milk powder, metalaxyl-Fumei double wettable powder, etc.Other fungicidesSuch as metalaxyl, sclerotin, procymidone, chlorhexidine, sterilized dan, captan, tefolin, carbendazim, rumen, formalin, high fat film, bactericidal clear, Pythium, quetia, dimethomorph, manganese zinc, and the like.

Understanding QoI Fungicides in Modern Agriculture
Strobilurin fungicides, also known as QoI fungicides (Quinone outside Inhibitors), have become essential tools in protecting high-value crops from fungal diseases. Among them, Azoxystrobin and Pyraclostrobin are two of the most widely used active ingredients globally.
While both belong to the FRAC Group 11, and share a similar mode of action by inhibiting mitochondrial respiration in fungal cells, they exhibit notable differences in residual activity, spectrum of control, systemic movement, and formulation compatibility. Understanding these differences is critical for making informed decisions in integrated disease management programs.

1. What Is Azoxystrobin?
Azoxystrobin is a broad-spectrum, systemic fungicide that has been widely adopted in crop protection for its long residual activity and preventive capabilities.
Key Characteristics:


Mode of Action: Inhibits electron transport at the Qo site in Complex III of mitochondria (FRAC 11)


Translocation: Xylem-mobile; translaminar movement


Systemicity: True systemic activity—can move through plant tissues


Target Diseases: Rusts, powdery mildew, leaf spots, downy mildew, blights


Crops: Used in cereals, vegetables, fruits, turfgrass, and ornamentals


Azoxystrobin’s advantage lies in its preventive efficacy and long-lasting protection, making it ideal for early-season disease control or programs requiring fewer applications.

2. What Is Pyraclostrobin?
Pyraclostrobin is another QoI fungicide, valued not only for its strong protective activity but also for its plant health benefits, including increased stress tolerance and crop vigor.
Key Characteristics:


Mode of Action: Same FRAC 11 mechanism—mitochondrial respiration inhibition


Translocation: Translaminar; locally systemic


Systemicity: Limited; not fully systemic like Azoxystrobin


Target Diseases: Anthracnose, rusts, leaf spots, scab, Sclerotinia, Alternaria


Crops: Soybeans, corn, potatoes, vegetables, tree nuts


Pyraclostrobin is often chosen for its curative effect and physiological benefits, including improved photosynthesis and drought resistance when applied under stress-prone conditions.

3. Azoxystrobin vs Pyraclostrobin: Comparison Table





Feature
Azoxystrobin
Pyraclostrobin




Fungicide Class
Strobilurin (QoI)
Strobilurin (QoI)


FRAC Code
11
11


Systemicity
Fully systemic
Locally systemic


Translocation
Xylem-mobile, translaminar
Translaminar only


Preventive Activity
Strong
Strong


Curative Activity
Moderate
Slightly stronger


Disease Spectrum
Broad (rusts, downy mildew, blights)
Broad (scab, Sclerotinia, leaf spots, rusts)


Residual Duration
Long (up to 21 days)
Moderate (10–14 days)


Plant Health Benefits
Moderate
Strong (increased vigor, drought tolerance)






4. Application Considerations: When to Use Which?


Choose Azoxystrobin when:


You need long-lasting residual control (e.g., in corn or wheat)


You’re applying early in the disease cycle as a preventive measure


You need systemic movement within the plant


Used in turf and ornamentals for broad coverage and longevity




Choose Pyraclostrobin when:


Your crop is under abiotic stress, like heat or drought


You seek both disease control and physiological enhancement


You require stronger curative activity


Used in soybeans and potatoes where vigor response is key




In many fungicide programs, Azoxystrobin and Pyraclostrobin are rotated or combined with other modes of action to improve disease control and delay resistance development.

5. Resistance Management and Tank Mix Strategies
Both Azoxystrobin and Pyraclostrobin are prone to resistance if used repeatedly as solo products due to their single-site mode of action. To manage resistance:


Rotate with fungicides from different FRAC groups, such as triazoles (FRAC 3), SDHIs (FRAC 7), or multi-site protectants like chlorothalonil (FRAC M5)


Use as a premix or tank-mix partner with complementary products


Follow label restrictions on number of sequential applications


Common commercial combinations include:


Azoxystrobin + Difenoconazole


Pyraclostrobin + Fluxapyroxad (for soybeans and corn)


Azoxystrobin + Chlorothalonil (for vegetables and turf)


Pyraclostrobin + Boscalid (for broad-spectrum control in leafy crops)



6. Conclusion: Azoxystrobin vs Pyraclostrobin – Which Is Right for You?
Both Azoxystrobin and Pyraclostrobin are leading strobilurin fungicides with overlapping but distinct profiles. While Azoxystrobin offers broader translocation and longer-lasting control, Pyraclostrobin brings plant health enhancement and stronger stress-response benefits.
Key Takeaway:For long residual, systemic movement, and early disease prevention—Azoxystrobin is often preferred.For short-term control, curative action, and improved crop vigor—Pyraclostrobin is a smart choice.
Selecting the right product—or a combination of both—depends on your crop, disease pressure, application timing, and overall program design.

Are You Looking for High-Quality Fungicide Formulations?
We supply a full portfolio of strobilurin fungicides, including:


Azoxystrobin SC, WG, and OD formulations


Pyraclostrobin SC and WDG


Custom premixes, OEM/ODM services, and global export packaging


Contact us today for free samples, technical support, or distributor partnerships.
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