American gooseberry mildew - combating

American gooseberry mildewis a disease that commonly affects gooseberries. Symptoms of the disease can be seen on leaves, shoots, and also on gooseberries. Fruits attacked by powdery mildew are unfortunately no longer fit for consumption. That is why it is worth getting to know the methods of fighting this disease, the gooseberry protection program against powdery mildew and how to prevent the appearance of powdery mildew in our garden.

American gooseberry powdery mildew - infected fruit
Fig. Mirabela, forum.PoradnikOgrodniczy.pl

How to recognize American gooseberry mildew?

American gooseberry mildewis a disease caused by the fungus Sphaerotheca mors-uvae. Symptoms of the disease can be seen on the shoots, top leaves and gooseberries. The infested parts of the plant become covered with a white, with time browning mycelium layer with visible conidial spores. Symptoms of infection on the tops of shoots can be observed from early spring, and the first mealy spots on leaves and fruits appear at the beginning of June. it slows down, the tops of the shoots die off, and the fruits are not matured, covered with brown spots and are not fit for consumption. Dry and warm weather favors the spread of the symptoms.

How to prevent American powdery mildew?

First of all, avoid planting gooseberry varieties easily affected by this disease. The varieties sensitive to the American gooseberry mildew include: Biały Triumf, Czerwony Triumf, Rzeszowski, Green Bottle, Yellow Triumph and Lady Delamere.Do not plant these gooseberry varieties in your garden!

Instead of these varieties, you should plant varieties resistant or rarely affected by mildew in your gardens, such as: Invicta, Resistenta, Pax, Kamieniar, Niesłuchowski, Hinnonmaki Rot.

It is also extremely important to provide the shrubs with appropriate growth conditions and a sunny and airy position. Gooseberries should not be grown in places with high air humidity and frequent mist (e.g. in depressions). The soil under the shrubs should be weeded regularly, and when watering the entire shrubs should be avoided - it is better to supply the water directly to the soil.
The development ofof the American powdery mildewis also favored by the excessive density of shrubs and shoots on the bush. Therefore, the bushes should not be planted too densely (recommended spacing is 1.5 m between shrub forms and 1 m between the standard gooseberry forms) and regularly cut the gooseberry through. During the growing season, symptomatic shoots should be removed on an ongoing basis.All fallen leaves and infected fruit should also be removed. They have to be thrown away, and preferably burned. We do not compost them under any circumstances.

Fighting the American gooseberry mildew - spraying, protection program

If varieties affected by powdery mildew of the American gooseberry are already growing in our garden and this disease has occurred in recent years, it is necessary to carry out a series of spraying in accordance withgooseberry protection program .
The risk of disease infection should be assessed based on the observation of the infestation of the shoot tips in early spring. Shoots showing signs of infection should be cut and removed from the plot. Then we start spraying on the following dates: before flowering, after flowering, after harvesting the fruit.

Note!When deciding to spray gooseberries in the period after flowering, remember about the grace period (the period that must pass from spraying to harvesting) .For some preparations, this period is as long as 21 days. Detailed information on the grace periods for each of the measures is provided below.

The following preparations are recommended to combat powdery mildew on gooseberries:
Topas 100 EC - use the agent preventively and in intervention, after the first symptoms of the disease appear, from the beginning of the inflorescence development phase to the end of the plant dieback phase. The recommended dose for a single spraying is 5 ml dissolved in 2-10 liters of water, which is enough to spray 100m² of crops. The interval between spraying should be at least 7 days, and the maximum number of sprays that can be done with this product during the growing season is 2. The withdrawal period in gooseberry crops is 20 days.

Magnicur Gold - use the product at the first symptoms of the disease or after the fruit is harvested. Dosage: dissolve 2 g of the preparation in 7.5 liters of water, which is enough for an area of ​​100 m².The interval between treatments is at least 14 days. During the season, a maximum of 2 sprays can be performed. The grace period is 14 days.

"border=0

Siarkol 800 SC - use the agent preventively or at the first symptomsdiseases, from the stage of development of shoots to the stage of appearance of the first flowers, and from the initial stage of fruit growth to the stage of fruit ripening. Dosage: dissolve 30 - 50 ml of the agent in 10 l of water, which is enough for a spraying of 100 m². You can spray a maximum of 2 during the growing season with an interval of at least 14 days. The grace period is only 7 days.
Siarkol Extra 80 WP - use the agent preventively or when the first ones appearsymptoms of the disease, from the stage when the flower buds are closed in light brown scales to the stage of the first flowers and the initial stage of fruit growth. Dosage: dissolve 30-50 g in 10 liters of water, which is enough for a spraying area of ​​100 m².During the growing season, you can spray up to 2 sprayings with an interval of at least 14 days. The grace period is 7 days.

"border=0

The number of sprays that need to be done againstAmerican gooseberry mildewis very large, and this is certainly not conducive to our he alth or the protection of the environment. If the gooseberry bushes in our garden are constantly affected by powdery mildew, it is better to remove them and plant a gooseberry variety resistant to powdery mildew or give up growing this shrub.