Is BOTRY-Zen® organic?

Yes. The product is certified organic by BioGro New Zealand as an input into organic production No 4405.

Is ARMOUR-Zen® organic?

No. Although ARMOUR-Zen® is a natural product, the active ingredient chitosan is not allowed to be used as an active ingredient in fungicides under the US organics system.

Is MIDI-Zen® organic?

MIDI-Zen® is a natural product, and is going through BioGro certification.

Does ARMOUR-Zen® kill Botrytis and Sclerotinia?

No. ARMOUR-Zen® is not fungicidal (killing the fungus) it is fungistatic (stopping disease progress). When on the plant material, in a concentrated form, ARMOUR-Zen® will stop the spores from germinating. As the concentration of ARMOUR-Zen® is diluted through rain and UV degradation the spores can germinate, therefore it is important to repeat applications of ARMOUR-Zen® under persistently wet conditions.

How often should I apply BOTRY-Zen® or ARMOUR-Zen®?

Refer to the best practice information for individual crops.

Click here for Botry-Zen. 

Click here for Armour-Zen.

How important are the two flowering applications of BOTRY-Zen® in grapes?

These are the most important applications for the season. Over flowering is whenBotrytis can initially establish within the canopy by colonising the dead and decaying floral tissue. Later in the season when the bunch is tight and the berries are ripening theBotrytis can move from the debris directly into the berries, infecting the bunch from the inside out. Because BOTRY-Zen® is a protectant it must be covering that floral debris prior to a Botrytis infection so that it can colonise that material faster than theBotrytis and exclude the disease from establishing.

Will BOTRY-Zen® work in a dry season?

It is important to apply BOTRY-Zen® over flowering even when the flowering is dry. This ensures that BOTRY-Zen® is on that floral debris and ready to exclude Botrytis as soon as there is an infection period. BOTRY-Zen® will stay dormant and active within the canopy until the ideal conditions for Botrytis infection occur. In dry seasons in Marlborough we find active BOTRY-Zen® on the floral debris at bunch closure that out competes the Botrytis when put under artificial infection conditions.

Why do you recommend leaf plucking in grapes?

Through the focus vineyard trials monitored by Plant and Food Research, there has been a significant improvement in product performance when leaf plucking prior to the flowering sprays is undertaken. For a product, such as BOTRY-Zen®, which does not translocate within the plant, improving the coverage within the canopy maximises the disease control.

Are ARMOUR-Zen® and BOTRY-Zen® able to control: Pseudomonas syringae pv. actinidiae (Psa)?

ARMOUR-Zen® and BOTRY-Zen® have both been included in the product testing programme carried out by Kiwi Vine Health. While BOTRY-Zen® has been added to the spray programme, ARMOUR-Zen® is yet to gain registration for Kiwifruit.

The BOTRY-Zen® I have is past the expiry date, can I still use it?

We would not expect the BOTRY-Zen® spores to be viable after the expiry date and therefore it will not protect your crop. However if you have large quantities of product please contact us and we may be able to test the granules for viability.

Are your products available outside of New Zealand?

BOTRY-Zen® is available in the US (California, Oregon, Washington and Florida) under the trade name BotryStop. And can be purchased through BioWorks Inc. Check BioWorks Inc website which details Technical Representatives throughout the USA .

BOTRY-Zen® is available in Korea also and can be purchased through Atlatec. Email them at