Chemical composition and bactericidal mechanism
- Active ingredients: Streptomycin sulphate (90%) and Tetracycline hydrochloride (10%) formulated as a Soluble Powder (SP).
- Protein synthesis inhibition: Streptomycin binds to the 30S ribosomal subunit of bacteria causing misreading of genetic code, while tetracycline blocks aminoacyl-tRNA binding, arresting bacterial reproduction.
- Systemic vascular absorption: Rapidly absorbed by foliage and translocated through plant vascular tissues to combat internal bacterial infections.
Approved target crops and bacterial diseases
Registered under CIBRC label directions for managing Bacterial leaf blight (Xanthomonas oryzae) in paddy; Citrus canker (Xanthomonas axonopodis) in lemons, limes, and oranges; Black rot in cabbage and cauliflower; Bacterial spot in tomato and chilli; and Bacterial stalk rot in maize.
Safe mixing, copper pairing and resistance stewardship
- Commonly tank-mixed with Copper Oxychloride (such as Blue Copper at 50% WP) to combine systemic antibiotic action with protective surface bactericidal cover.
- Apply at the earliest visual appearance of bacterial ooze or water-soaked leaf streaks.
- Strictly follow approved label dosages (typically small gram quantities per tank); avoid indiscriminate over-application to prevent bacterial resistance development.
- Observe prescribed Pre-Harvest Intervals (PHI) before harvesting edible crops.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the active chemical composition of Streptocycline?
It contains Streptomycin sulphate (90%) + Tetracycline hydrochloride (10%) in a water-soluble powder formulation.
Why is Streptocycline often combined with Copper Oxychloride?
Streptocycline enters plant vascular tissues to fight internal bacterial infection, while Copper Oxychloride provides a protective surface bactericidal barrier.
What major bacterial disease does it control in rice?
It is widely used to manage Bacterial Leaf Blight (BLB) caused by Xanthomonas oryzae pv. oryzae in paddy fields.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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