Detailed Information on SUNBK (AXEB, China)

What It Is / Mode of Action

• According to AXEB, SUNBK is a biochemical pesticide (“真菌疫苗” = “fungal vaccine”). AXEB China+1

• It does not directly kill pathogens. Instead, it activates the plant’s own immune system. AXEB China+2AgroPages News+2

• AXEB uses a “green nanoscale core-shell encapsulation” technology in SUNBK, which likely helps in controlled release or stability. AXEB China

• 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

• According to the AXEB product page, the application is foliar spray (“叶面喷雾”). AXEB China

• 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

• 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

• The dilution rate given on AXEB’s site is 1000× to 1500×. AXEB China

• 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

• After dilution (“稀释”), the product should be used immediately, per AXEB’s instructions. AXEB China

• They also caution to test on a small/limited area first for crop sensitivity before spraying over the entire field. AXEB China

Frequency / Interval

• Re-application is recommended every 7–10 days, as needed, especially under conditions favorable for disease. AXEB China

• Since it works by stimulating plant defense, its efficacy depends on timely application (pre-disease) rather than waiting for heavy infection.

Limitations / Notes

• Because it doesn’t directly kill fungi, in severe disease outbreaks you likely need to tank-mix with conventional fungicides for control. AXEB China

• The “vaccine” terminology means its role is more preventive: boosting resistance rather than curing an established infection.

• 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.”

• 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

• SUNBK is a preventive biocontrol tool, not a classical fungicide.

• Best used in integrated disease-management programs: use before disease, especially under wet conditions, and reapply every 7–10 days.

• 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.

• 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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