Active Ingredient and Mode of Action
Kasu-B contains Kasugamycin (3% SL), an antibiotic active derived from the fermentation of Streptomyces kasugaensis.
It acts by inhibiting bacterial and fungal protein biosynthesis at the 30S ribosomal subunit, halting hyphal elongation and appressorial penetration into host tissues.
Its systemic translaminar and acropetal movement ensures rapid translocation throughout crop foliage.
- Formulation: 3 percent Soluble Liquid (SL)
- Dual activity: Controls both fungal blast pathogens and destructive bacterial blight strains
- Systemic mobility: Rapidly absorbed through leaves to protect new expanding vegetative tissues
Target Crop Diseases and Approved Applications
Kasu-B is widely recognized for managing destructive blast and bacterial diseases in wetland rice crops.
It is deployed preventively or at the earliest onset of foliar spindle-shaped lesions to prevent neck blast epidemics.
- Paddy leaf blast (Pyricularia oryzae): Controls spindle lesions on vegetative rice foliage
- Paddy neck blast: Protects panicle nodes during boot-leaf and heading phases to prevent unfilled grains
- Bacterial blight: Suppresses bacterial leaf blight (Xanthomonas oryzae) in paddy and vegetables
Application Guidelines, Mixing, and Safety
Dilute the required liquid concentrate in clean water and apply using high-volume knapsack sprayers.
Ensure thorough spray coverage of both lower tillers and emergent panicles during late vegetative and heading stages.
Observe label-specified pre-harvest waiting periods and store containers in dry, secure sheds.
- Spray timing: Apply at tillering for leaf blast, and at late boot-leaf stage for neck blast prevention
- Water volume: Use adequate spray water volume per acre for thorough tiller and leaf sheath wetting
- Safety precautions: Wear protective rubber gloves, mask, and protective goggles during handling
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active constituent of Kasu-B?
Kasu-B contains Kasugamycin 3% SL, an antibiotic fungicide and bactericide.
Does Kasu-B control neck blast in paddy?
Yes, spraying Kasu-B at the boot-leaf to early heading stage is highly effective in preventing rice neck blast and panicle rot.
Is Kasu-B safe for beneficial soil microorganisms?
Yes, Kasugamycin exhibits high selectivity, breaking down safely without leaving harmful soil residues.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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