- Registration and uses
- New Zealand Registration and safety information
- Trial Reports
NSA is a new improved liquid potassium soap formulation. It has a slightly higher concentration than other potassium soap products, Protectorhml and HML32, and its milk-like consistency allows for easier handling and mixing.
Registration and uses
NSA is registered by the Ministry for Primary Industries, Agricultural Chemicals Veterinary Medicines Group (ACVM). Its registered number is P9909. Its mode of action is contact.
It’s highest spreading ability is achieved at a rate of 1L/100L at which time surface tension is nearly eliminated. This is the optimal rate for most applications, including any mix with copper in it.
Another useful adjuvant rate is 0.5L/100L. When using with sulphur and HML Silco (potassium silicate) this mix produces excellent efficacy against Powdery Mildew.
It is BioGro certified as an adjuvant at any rate.
NSA has a registered claim for Powdery Mildew control at 1% concentration in combination with a number of additives including cuprous oxide fungicides at an elemental Cu rate of 22 grams per litre NSA, sulphur fungicides, HML Potum (potassium bicarbonate) and HML Silco (liquid potassium silicate.
If using Nordox WG75, this would mean 30g/100L for a 1% rate of NSA. If using Norshield WG45, this would mean 50g/100L for a 1% rate of NSA.
NSA also has a registered claim for Downy Mildew control at 1% and 2% concentration (depending on disease challenge) in combination with 22 g elemental copper (sourced from a cuprous oxide fungicide) per litre of NSA. If using Nordox WG75, this would mean 30g/100L for a 1% rate of NSA and 60g/100L for a 2% rate of NSA.
NSA has a registered claim for suppression of Botrytis. It is thought that the suppression is mainly generated by NSA’s efficacy in combination with other products for the prevention of Powdery Mildew and Downy Mildew.
Botrytis control as a consequence of ‘Enhanced Maturity’ with timed use in combination with HML Potum (potassium bicarbonate) has not been specifically verified – but these benefits are thought to be highly likely to follow as they did for HML32.
Click here for the recommended spray programme using NSA and additives.
Click here for the NSA Product Combination Sheet.
New Zealand Registration and safety information
Refer to nz.grochem.com for registration and safety information.
Two large trials have been undertaken to demonstrate the efficacy of NSA and its various combinations for the prevention of Powdery Mildew and Downy Mildew as well as for the eradication/suppression of live Powdery Mildew infection.
The results of these trials demonstrate that NSA is at least as effective, and sometimes better than the recommended Protectorhml and HML32 combinations for Powdery Mildew and Downy Mildew control.
- 2022-23 Grape Powdery Mildew Prevention Trial, Ngatarawa Rd, Hawke’s Bay[PDF/1MB]
- 2022-23 Grape Powdery Mildew Eradication Trial, Ngatarawa Rd, Hawke’s Bay[PDF/2MB]
- Statistician’s report on regarding individual treatment ‘drivers’ in respect of the 2023 Grape Powdery Mildew Eradication Trial[PDF/1MB]
- 2022-23 Grape Downy Mildew Prevention Trial, Ngatarawa Rd, Hawke’s Bay[PDF/2MB]
- 2021-22 Grape Powdery Mildew Prevention Trial, Marlborough[PDF/3MB]
- Video – Spreading and wetting ability of NSA (1l/100L) + HML Silco (250ml/100L) + Norshield (33g/100L)
- UC Davis Grape Powdery Mildew screening prevention trials 2021[PDF/1MB]
- UC Davis 2021 Powdery Mildew screening trials - NSA specific data[PDF/1MB]