- General information
- New Zealand Registration and safety information
- Research and trials
- Other technical publications/papers to assist
Food grade ingredients
Protectorhml is a potassium based liquid soap containing specific complexes. All ingredients involved in the manufacture of Protectorhml are food or food grade. Protectorhml has a long history of excellent plant safety. Unlike other potassium soaps it has no insecticidal ability but it has profound fungicidal, fungistatic and adjuvant properties.
Protectorhml is completely saponified and does not contain free vegetable oils. Four major issues have been eliminated because of this: an off flavour in juices close to harvest, the inherent risk of any oil (mineral, vegetable or fish) when combined with sulphur causing phytotoxicity, the effects of any oil on plant growth and free oil falling out of solution in sprayers because no emulsifier is present.
Registration and uses
Protectorhml is registered by the Ministry for Primary Industries, Agricultural Chemicals Veterinary Medicines Group (ACVM). Its registered number is P7149. Its mode of action is contact.
There is extensive research on its use as a fungicide; however it is mainly used in the grape industry as an adjuvant with sulphur for the control of powdery mildew. It works by spreading sulphur over an area five times larger than what it would normally achieve in solution (slides 6 and 7 of the power point presentation in the link below) and gathering spores together (slide 8) compared with another potassium soap with free vegetable oil (slide 9).
It is BioGro certified at 0.5% rate.
Protectorhml at 2% concentration has been registered for botrytis control since 2003.
Protectorhml received registration for Powdery Mildew control in April 2019 at 1% concentration in combination with 22 g elemental copper (sourced from a cuprous oxide fungicide). If using Nordox WG75, this would mean 30g/100L for a 1% rate of Protectorhml.
Protectorhml also received registration for Downy Mildew control in April 2019 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 Protectorhml. If using Nordox WG75, this would mean 30g/100L for a 1% rate of Protectorhml and 60g/100L for a 2% rate of Protectorhml.
Click here for the recommended spray programme incorporating Protectorhml alongside HML32.
Historically, there were many independent trials in grapes comparing the performance of a program of Protectorhml and sulphur to a conventional chemical program including DMIs and more modern compounds and it has been found to produce robust equivalent efficacy against powdery mildew. Refer to Organic Focus Vineyard final report.
More recently with the advent of chasmothecia (the sexual stage of grape powdery mildew) the challenge of powdery mildew has increased and Protectorhml has become the base of a more advanced product, HML32, which together with various additives protects as well as eradicates powdery mildew infection.
It is registered in California as an adjuvant under the name of Saponel. There it has OMRI status for use in organics, as it has here with BioGro - Licence Number 5097.
It is also registered in Australia as an adjuvant under the name of HML Point Five and has ACO organic certification. It is not yet in the Australian market.
Please scroll down on the right hand side of this document for more information.
New Zealand Registration and safety information
- Protectorhml product label 20L - Front [PDF/802KB]
- Protectorhml product label 20L - Back [PDF/820KB]
- Protectorhml product label 200L - Front [PDF/801KB]
- Protectorhml product label 200L - Back [PDF/818KB]
- Protectorhml safety data sheet [PDF/235KB]
- Protectorhml BioGro certificate 2019–2020 [PDF/943KB]
Research and trials
- Protectorhml Powerpoint presentation [PPT/2.52MB]
- Plant and food research - Protectorhml and HML32 botrytis cinerea assay, 2012 [PDF/338KB]
- Plant and food bioassay - Protectorhml vs blackspot and elsinoe, 2009 [PDF/2.53MB]
- Protectorhml pH dilution study - Jaychem, 1/11/2012[PDF/16.9KB]
- Spreading effects of Protectorhml on sulphur [PDF/3.23MB]
- 2010 Technical notes for the use of Protectorhml for powdery mildew and botrytis control [PDF/378KB]
- Evaluation of Protectorhml and sulphur for control of powdery mildew on grape 2006/07 and 2007/08 – report [PDF/281KB]
- Protectorhml and copper for control of powdery mildew on grape – summary of four years of Hort Research trials [PDF/52KB]
- Protectorhml for control of botrytis on Grape – summary of seven years of Hort Research trials [PDF/48KB]
- Eradicant trial (hand sprayed) on grape – verdelho raw results (2006–2007) [PDF/40KB]
- Erinose Mite Trial 2007/08 – a program or single application [PDF/246KB]
- Hort Research – black spot on apple [PDF/348KB]
- Hort Research – powdery mildew on liberty apple [PDF/326KB]
- Hort Research – bacterial screenings on fireblight, tomato spot and speck and kiwifruit blossom blight [PDF/786KB]
- Hort Research – evaluation of organic products for powdery mildew control in apple [PDF/286KB]
- Geelen Research – fireblight trial on pears [PDF/2048KB]