2H13®
Half the copper - Full effect

What is 2H13?

2H13 is a newly authorised additive in Germany and Austria (BVL and FiBL). 2H13 consists of granulated cells of the yeast strain Meyerozyma guilliermondii 2H13.

Effect of 2H13

2H13 improves the effectiveness of copper when used against oomycetes (late blight on potatoes, vine pernospora) and the effectiveness of sulphur against storage scab and storage rot on apples. It is authorised as an additive to copper- and sulphur-containing fungicides and fungicidal single-site inhibitors at an application rate of 0.05% in the spray mixture (0.5 g/l) in fruit, vine, vegetable and ornamental plant cultivation and arable farming. The application rate of copper can be reduced to approx. 30-50% of the full application rate without any loss of efficacy.
When added to fungicides, 2H13 improves the spraying behaviour and the deposition of the active ingredients on the plant surface. This improves the biological effectiveness of fungicides.

Mixability of 2H13

Miscibility is product-specific. A current list of tested miscibilities can be found here.

If products are not listed, we will carry out miscibility tests.

Numerous trials prove the effect

Successful trials have already been carried out in potatoes, grapes, apples and cucumbers. The effect of 2H13 is also being tested in strawberry cultivation. We assume that the addition of 2H13 to fungicides against Botrytis cinerea in strawberries will improve the effect and slow down the development of resistance to the fungicides. In 2025, we began trials in hops against downy mildew (Pseudoperonospora humuli)

Use of 2H13 in potatoes

Numerous trials show that the addition of 2H13 to copper treatment in potatoes against late blight (Phytophtora infestans) improves the effect. With a reduced amount of copper, the addition of 2H13 was found to maintain the same effectiveness.

Higher yields in potatoes with 2H13

The calculation of 16 trials showed that the addition of 2H13 had a significantly positive effect on yield. The yields were on average 7% higher compared to the solo copper treatment.

Use of 2H13 in wine cultivation

In field trials in vineyards in Germany and Austria to combat downy mildew (Plasmopara viticola) on grapes, the addition of 2H13 to reduced amounts of copper in the average of 7 trials led to a significant increase in effectiveness of 20% compared to the low amount of copper alone. In organic vineyards, the triple mixture of sulphur + reduced copper + 2H13 is recommended for the simultaneous control of powdery mildew (Oidium tuckeri) and downy mildew (P. viticola).

Use of 2H13 in apple cultivation

In the control of storage scab and storage rot in apples, 2H13 supports the effect of the agents used. Numerous trials are now available. In summary, the results show that

• Neofabraea alba (Gloeosporium) in apple wounds Significant improvement in the effect of net sulphur through the addition of 2H13.
• Neofabraea perennans (Gloeosporium) in apple wounds Improvement of the effect of Flint and Geoxe by the addition of 2H13 to the fungicide.
• Monilia fructigena in apple wounds Significant improvement in the effect of net sulphur by adding 2H13 compared to the control.
• Significant improvement in the effect of Geoxe through the addition of 2H13. The experiment was carried out with the multi-resistant strain Bc73 (see Fig.).

Use of 2H13 in berry cultivation

In strawberries, the addition of 2H13 to botryticides from flowering onwards delayed the development of resistance in the grey mould pathogen (Botrytis cinerea) and improved the fungicidal effect. This improves the control of grey mould (Botrytis cinerea), even in fungicide-resistant strains.