Weed, Fungus and Stress Control in Peonies

In this newsletter we discuss some current affairs in the field of peonies.

Weed Control

There are some changes in the field of weeds. Here is an overview of the most important products that are used in peonies around this period.

New product: Oblix 500 SC

Is a soil herbicide based on ethofumesate with a systemic action via the underground parts of the weeds. Has a contact effect on weeds in the germ layer. A moist soil promotes the effect. Oblix controls a broad spectrum of annual weeds. Approved as a bottom top treatment (hood sprayer) with a dosage of 0.6 l / ha. The agent may be applied twice a year.

The loss of Lentagran makes this a nice addition to the package.

Gallant 2000 – end of admission

Gallant 2000 is going to lose its authorization. The period you can still purchase it (delivery term) is June 30, 2021. The final use period is August 31, 2021. Keep this in mind if you still want to use the product. Gallant is used against grasses, including annual meadow grass. Dosage is 1 l / ha.

Lentagran – end of authorization (in floristry crops)

At the end of September, the CTGB completed the re-registration of Lentagran WP. Some crops have disappeared from the label, including floristry crops. This means that we can apply Lentagran in the peony for the last time this season. Delivery term for Lentagran WP for floristry crops, among other things, is April 2, 2021. The use-up period is September 2, 2021.

If you still want to use Lentagran this season, you must purchase it before April 2.

Goltix WG / Bettix SC

Both products are based on metamitron and have both soil and contact effect. Goltix WG is granulate and Bettix SC is liquid. Has an effect on ground herb, shepherd’s purse and chamomile, among other things.

Goltix Queen

Goltix Queen is a combination of a known active ingredient; metamitron and a new post-emergence substance; quinmerac. As a result, the effect compared to metamitron alone is stronger on, among others; goosefoot (melde), cleavers, peach herb and dog parsley. Goltix Queen provides an after-effect against weed seedlings and also a synergistic effect with other post-emergence herbicides.

Corzal SE

Corzal SE is a foliar herbicide without soil action. The agent controls annual broadleaf weeds. Preferably apply to very young weeds (germ leaf stage). Less sensitive weeds include chamomile, cleavers, pig grass, peach grass, water pepper, and rapeseed storage plants. Grasses and root weeds are not controlled. In peonies, this medicine is almost always used in combination with medicines containing metamitron.

Vivendi 100

Contains the same active ingredient as Lontrel. The product is a systemic foliar herbicide with some residual effect via the soil and has a strong effect on present thistles, butterbur, clover, bud herb, many-buds (including peach herb, pig grass) and an effect on composites and black nightshade. During certain circumstances, peonies can be sensitive and crop reaction can occur.


We compile advice in consultation with you on the basis of the weed pressure and type, time and soil type.
Basic advice for a bottom application could be a combination of the following 3 resources;

0.5 – 1.5 kg / l / ha Goltix WG or Bettix SC or Goltix Queen
0.5 – 1.5 l / ha Corzal SE
1.0 – 2.0 l / ha Oil

For all remedies with a soil action, a moist soil contributes to the success of the (longitudinal) action.


Squall has proven itself in recent years in peony cultivation, among other things. New is that Squall is allowed as a Drift Reducing Technique when injected. With a 90% cap it is then possible to spray agents that have a 95% drift reduction requirement, which does not always require a pressure registration. Squall also gives a better coverage due to the strong adhesion and improved flow. Two birds with one stone!

Mold Control

Below some products that have been changed:


This agent is 100% identical to AmistarTop. The label of AmistarTop has changed and may therefore no longer be used in peonies. Alibi Flora is available from around mid-April in 1 and 5 liter packaging. Has a good effect on botrytis and leaf spot disease. Label dosage: maximum 2 applications per year of 0.9 l / ha with a minimum interval of 7 days.


This agent is 100% identical to Switch. Palladium is available in 5 kilo packaging. Palladium has a price-technical advantage.

Mancozeb containing agents

This year is the last year that you can still use mancozeb containing products. These include; Mastana SC, Penncozeb SC, Dithane DG and Tridex DG.

The definitive date of the sale and use up period has yet to be determined by the CTGB.

Stress and fungal control agents can be combined well in most cases. For a tailor-made schedule; contact your cultivation specialist.


A successful way to remove the sticky sweet excretion of a peony or honeydew and thus prevent sooty mold.

In the cultivation of peonies, among other things, the flowers can under certain circumstances secrete a sticky sweet substance (resin) and sooty mold (fungus) can develop on this. In addition, aphids deposit honeydew, which can also result in sooty mold. Usually irrigation is done to prevent this. If this is not possible due to circumstances, Previsan can be an aid.

The experiences are good. In addition to preventing the sooty mold, fluffing is also a lot faster. For more information, read the product information sheet

Stress Management

The resilience of various crops, including peonies, can be increased by using StressImmune and AminoBoost.

StressImmune is a combination product of seaweed extract and amino acids. This combination gives the plant more resistance to biotic stress (heat, drought, frost, etc.). There are now many good experiences in various crops. The dosage is 1-1.5 l / ha with an interval of 10 to 14 days. If severe stress is expected (heat, frost), 2.5 liters / ha can be applied a few days before this period.

After a stress period, the plant can be supported with 2.5 l / ha AminoBoost.

This product contains many amino acids, among other things. Because the plant produces it less or more difficult due to stress, you can support the plant with it. As a result, the plant continues to grow better.


StressImmune can be widely used against stress. A preventive use activates the plant immune system so that diseases and pests are more strongly repelled and the vitality of a plant increases.

The amino acids in Aminoboost accelerate the recovery of the plant after a stress period. By treating the crop in time for the ripening period, growth can be extended.

In this newsletter we will discuss some current topics considering the growth of peonies.

Crop position
The Dutch Peony Season has started late because of the cold weather. Due to these weather conditions, damage has occurred here and there which has increased the pressure of botrytis. Common remedies that can be used include Luna Sensation, Frupica and Switch/Palladium.

Peonies in greenhouses
The cultivation of peonies in greenhouses requires extra attention as compared to outdoor peonies. At CAV Agrotheek, we have gained quite some experience in this cultivation and we have seen an upward trend in crop status for three years in a row. This is mainly due to an innovative approach regarding soil balance.

Note: Do not forget to monitor the fertilization after the harvest.
Looking for more advice?
Please contact our cultivation advisor Michel de Groot.

Phytophthora increase in peonies
We are seeing an increase in problems with phytopthora in several lots. Plants that were still producing plenty last year may be completely spoiled this year. There are several reasons for this: what we currently see is the result of last year’s weather conditions.

Abundant rain after a dry, warm period encourages fungus to form swarm spores. These can infect parts of the plant. Infestation is strongest at temperatures between 20 and 30 degrees celcius. Lots or places with structural problems are extra sensitive. We encounter this particular problem in several cultivars of various ages. Since a number of days, the image of above-ground phytopthora can also be found in the crop.
Advised resources include Axidor and Ranman Top.
Meanwhile, CAV Agrotheek has started a major multi-year investigation. We will keep you posted.

Lettuce rootworm
Last week, the first empty cocoons/shells of the lettuce rootworm were found outside. Therefore, check your plots. The pressure is particularly low this year.
In recent years, many plots have been successfully treated with insect parasitic nematodes. There are also possibilities with Botanigard WP.
From experience we know that after some 3 weeks the eggs will hatch and the young caterpillars will start looking for the underground parts of the peony. This means that you can start the treatment from about week 23/24.
In both ways, the action plan is crucial to get good results.

A successful way to remove honeydew and thus prevent sooty mold.
In the cultivation of peonies, the flowers may start to secrete honeydew under certain circumstances, which can lead to sooty mold (fungus). Fluffing is also less easy. Previsan can be the means to prevent this from happening.
Experiences are good. In addition to preventing sooty mold fungus, fluffing is also a lot faster.

Stress management
Due to the cold weather there is a lot of “stress” in the plant. The experience of supporting the plant with Aminoboost is quite good. This product contains high-quality amino acids. Because the plant produces less (or more difficult) amino acids due to stress, one can support the plant. Dosage; 2 liters per hectare. This can be used in combination with various means.

Pre-treatment agents for peonies
At auctions it is obliged to treat the peonies with the pre-treatment agent Florrissant 500N (“the chlorine pill”), or possibly the liquid version: Florissant 520. The latter is particularly suitable for use in the barrel filler equipped with a dosing installation.
Peony blades and rain suits are also available at CAV Agrotheek.

Want to know more?
For more information, please contact your cultivation specialist or the Agrotheek head office.

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