Bacterial diseases are the hardest problems in a crop program because so few active ingredients touch them at all — which is why copper, in one form or another, sits in almost every bacterial program sold. Oxine-copper is the organic copper of that family, and in the BNSD Agro (Shandong Bainong Sida Biotechnology Co., Ltd.) range it is registered inside a 45% kasugamycin + oxine-copper SC aimed at bacterial diseases, with peach bacterial shot hole as the Chinese label target. This guide explains what an organic copper is, how the systemic antibiotic and the contact copper divide the work, the cautions every copper program needs, and the sourcing checks for the SC. The complete catalogue sits on the fungicides page, and samples or registration documents are available through the contact page.
What Is Oxine-Copper?
Oxine-copper is the copper salt of 8-hydroxyquinoline — an organic copper fungicide-bactericide in FRAC group M1. Like all coppers it is a multi-site protectant: contact activity that kills spores and bacterial cells on the plant surface before they enter tissue, with no systemic movement. Multi-site modes are inherently resistance-safe, which is why coppers survive as the backbone of bacterial programs decade after decade.
The “organic” label is the differentiator versus inorganic coppers (copper hydroxide, copper oxychloride, Bordeaux mixture). Organic coppers deliver a lower metal load per unit of efficacy: the copper is chelated or complexed into an organic carrier, so more of the applied copper becomes biologically available and less inert metal is sprayed onto the canopy. Practical consequences for buyers:
- Less metallic copper per hectare for the same protective effect — a real argument in markets where copper accumulation in orchard soils is under scrutiny.
- Cleaner residue and tank behaviour than heavy inorganic slurries.
- A formulation story that pairs well with modern SC technology — the registered product here is a suspension concentrate, not a wettable powder.
Registered Use: 45% Kasugamycin + Oxine-Copper SC
In the BNSD Agro range, oxine-copper is registered in China as part of this combination:
| Product | Registered target (Chinese label) | Label rate |
|---|---|---|
| 45% kasugamycin + oxine-copper SC | Peach bacterial shot hole | 2000–3000× dilution |
This is a Chinese registration label rate. In your own market the destination label governs — registration scope and rates differ country by country, so treat the figure as a positioning reference, not a spray recipe for another jurisdiction. Peach bacterial shot hole is a stone-fruit bacterial disease that pits and holes the leaves and can mark the fruit, and it is a classic case where protection must be laid down before entry points open.
Systemic + Contact in One Pass
The construction of the 45% SC is the reason bacterial buyers shortlist it. Kasugamycin is an aminoglycoside antibiotic with systemic activity — it moves into plant tissue and stops bacteria already inside, covering the curative phase. Oxine-copper is the contact protectant that holds the surface against new infections between sprays. One spray therefore covers both phases of the bacterial problem:
- Kasugamycin half: systemic, works inside the tissue where a copper alone cannot reach.
- Oxine-copper half: multi-site contact protection on the surface, reducing the reinfection pressure the antibiotic has to carry.
- Resistance logic: a single-site antibiotic paired with a multi-site copper reduces the selection pressure on the kasugamycin target — the copper keeps doing surface work that does not generate single-site resistance.
For orchard programs this means the antibiotic is spent where it is irreplaceable, and the surface load is carried by a chemistry built for it.
Copper Phytotoxicity: Where Caution Pays
Every copper program needs a phytotoxicity conversation, and organic coppers are no exception — their gentler metal load lowers the risk but does not remove it:
- Sensitive crops and stages. Copper scorch risk is highest on tender young tissue and on naturally copper-sensitive crops; follow the crop, stage and rate restrictions on the destination label rather than stretching dilutions.
- Cool, humid conditions. Slow drying in cool wet weather extends leaf-wetness contact time and is the classic setup for copper marking. When the forecast stays wet and cool, sequence coppers with other tools rather than stacking them.
- Do not improvise tank mixes. Coppers are reactive with acidic and sulphur-containing materials; keep the mixing plan on-label.
A Full Bacterial Disease Toolkit, Not One Bottle
No single active manages bacterial disease, and buyers should price the program rather than the bottle. A complete bacterial program has four legs:
- Sanitation. Remove infected twigs, cankers and fallen material; disinfect pruning tools; manage orchard floor debris that carries inoculum between seasons.
- Vector and entry-point control. Bacteria enter through wounds, natural openings and insect feeding scars — managing the insects and the wound calendar reduces the infection surface a copper has to defend.
- A copper protectant on the surface. Oxine-copper’s role: multi-site, resistance-safe cover that holds the entry points between passes.
- A systemic antibiotic for the curative pass. Kasugamycin’s role: reach bacteria already inside the tissue, at the moments the label allows.
The 45% kasugamycin + oxine-copper SC bundles legs three and four in one registered product; legs one and two remain the grower’s discipline.
Sourcing a Kasugamycin + Oxine-Copper SC: Buyer Checklist
A suspension concentrate carrying two dissimilar actives is a demanding formulation — check it like a professional:
- No crystallisation or hard sediment. Both actives must stay evenly dispersed through shipping temperature cycles; a hard bottom cake that will not redisperse is a failed batch.
- Suspensibility after dilution. Uniform through the whole spray job with gentle agitation — no layering, no nozzle blockage from coarse particles.
- Content released by HPLC against the registration standard. Two actives means two assays; at BNSD Agro every batch is analysed by HPLC or GC and released against the registration standard before shipment (company practice).
- Viscosity and filling accuracy. Over-thick SCs pour badly and short-weight; demand pouring and net-fill behaviour on spec.
- Documents and pack ladder. Pesticide registration certificate, production licence and batch traceability in the supplier’s own name, pack sizes agreed in the contract.
FAQ
What is oxine-copper registered for in China?
In the BNSD Agro range it appears in the 45% kasugamycin + oxine-copper SC, registered for peach bacterial shot hole at 2000–3000× dilution. Bacterial uses on other crops in your market follow the destination label, not the Chinese one.
How is an organic copper different from inorganic copper?
Organic coppers complex the copper into an organic carrier, giving a lower metal load per unit of efficacy than inorganic coppers such as copper hydroxide or copper oxychloride. The mode of action stays the same: multi-site contact protection, FRAC M1, inherently resistance-safe.
Why combine kasugamycin with oxine-copper?
Kasugamycin is systemic and works on bacteria already inside tissue; oxine-copper is a contact protectant that holds the surface between sprays. Together they cover the curative and protective phases of bacterial disease in one pass, and the multi-site partner reduces selection pressure on the antibiotic.
Is copper safe on all crops?
No. Copper phytotoxicity risk rises on sensitive crops and young tissue, especially under cool, humid conditions with slow drying. Follow the destination label’s crop, stage and rate limits, and keep the tank-mix plan on-label.
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