Common agricultural fungicide powder formulations
- Mancozeb 75% WP: Broad-spectrum protective contact dithiocarbamate fungicide widely used for blights and leaf spots across field and fruit crops.
- Copper Oxychloride 50% WP (COC): Multi-site contact protectant and bactericide (Blue Copper) effective against citrus canker, downy mildew, and anthracnose.
- Carbendazim 50% WP: Systemic benzimidazole fungicide used for seed treatment and soil drenching against vascular wilts and root rots.
- Wettable Sulphur 80% WP: Contact protectant and acaricide delivering excellent control of powdery mildew and spider mites.
Slurry preparation and tank suspension technique
Never dump dry wettable powder directly into a full spray tank, as it forms floating, unmixed lumps that clog filters and spray nozzles. Always prepare a smooth slurry first: measure the required powder quantity into a small bucket with a little clean water, stir thoroughly until smooth, and then pour it into the half-filled spray tank through the basket strainer with continuous agitation.
Nozzle selection, spray safety and storage
- Use diaphragm-pump sprayers or sprayers with continuous hydraulic agitators to keep heavy powders in uniform suspension.
- Select durable ceramic or hardened stainless steel hollow-cone nozzles that resist abrasive powder erosion.
- Store dry powders in tightly sealed containers in a dry, well-ventilated storeroom to prevent moisture caking and degradation.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
Why is pre-mixing a slurry mandatory when using wettable powders (WP)?
Wettable powders contain wetting and dispersing agents that require active pre-mixing in a small volume of water to disperse fully without forming lumps.
What happens if a spray tank is left without agitation when using powder fungicides?
Heavy powder particles settle to the bottom of the spray tank, leading to weak chemical delivery at first and heavily concentrated, nozzle-clogging sludge at the end.
Where can farmers check approved fungicide powder registrations?
On the official portal of the Directorate of Plant Protection, Quarantine & Storage (ppqs.gov.in) under CIBRC approved lists.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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