Detailed Information on SUNBK (AXEB, China)
What It Is / Mode of Action
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According to AXEB, SUNBK is a biochemical pesticide (“真菌疫苗” = “fungal vaccine”). AXEB China+1
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It does not directly kill pathogens. Instead, it activates the plant’s own immune system. AXEB China+2AgroPages News+2
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AXEB uses a “green nanoscale core-shell encapsulation” technology in SUNBK, which likely helps in controlled release or stability. AXEB China
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Experimental data (presented by AXEB) reportedly shows increased plant polyphenol oxidase (PPO) levels and phenylalanine ammonia-lyase (PAL) activity, which are markers of plant immune activation. AgroPages News
Crops / Application Window
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According to the AXEB product page, the application is foliar spray (“叶面喷雾”). AXEB China
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The recommended timing is broad: during early flowering, full flowering, fruit development, fruit setting, and veraison (the stage when grapes, for example, change color) — essentially “throughout the entire process.” AXEB China
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Because it is immunity-activating (rather than directly fungicidal), the label suggests to apply before disease onset or prior to prolonged wet weather for optimal effect. AXEB China
Dose / Dilution
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The dilution rate given on AXEB’s site is 1000× to 1500×. AXEB China
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They also recommend mixing it with chemical fungicides when disease pressure is severe. SUNBK alone “has no direct effect on pathogens” in such cases. AXEB China
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After dilution (“稀释”), the product should be used immediately, per AXEB’s instructions. AXEB China
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They also caution to test on a small/limited area first for crop sensitivity before spraying over the entire field. AXEB China
Frequency / Interval
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Re-application is recommended every 7–10 days, as needed, especially under conditions favorable for disease. AXEB China
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Since it works by stimulating plant defense, its efficacy depends on timely application (pre-disease) rather than waiting for heavy infection.
Limitations / Notes
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Because it doesn’t directly kill fungi, in severe disease outbreaks you likely need to tank-mix with conventional fungicides for control. AXEB China
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The “vaccine” terminology means its role is more preventive: boosting resistance rather than curing an established infection.
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Crop-specific data (which pests or fungal species it is most effective against) is not publicly detailed on AXEB’s product page: they don’t list exact pathogen species, or “this works on powdery mildew / downy mildew / specific fungi.”
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There is no publicly available peer-reviewed data (from my search) that gives detailed field trial efficacy (disease reduction percentages) for specific crops / pathogens.
Conclusion / Interpretation
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SUNBK is a preventive biocontrol tool, not a classical fungicide.
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Best used in integrated disease-management programs: use before disease, especially under wet conditions, and reapply every 7–10 days.
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Because of its mechanism, it's likely most suited for high-value crops (fruit, vegetables, maybe vineyards / orchard) where disease risk is predictable and frequent.
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Given the lack of specific pathogen-target data, growers would need to do small-scale testing or rely on AXEB’s local technical support before wide adoption.
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