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The so-called Monilia lace drought is a plant disease called by a fungus Monilia laxa is triggered and mostly attacks stone and pome fruit trees. Although the disease may ultimately even kill the infected plants, the real threat is that the pathogen can outlast even the hardest winters and usually spreads quickly to other plants.
Which plants are particularly threatened by Monilia?
Even if the Monilia lace drought can attack pome fruit, it represents a much higher risk for stone fruit, such as plums, apricot or sour cherry. The sour cherry variety "shadow morel" is considered particularly endangered. Although it should be noted that not only fruit trees, but also various ornamental plants, such as almond trees, can contract acute drought.
Prevent Monilia Disease properly
For new plantings, it is recommended to choose plants that are as resistant as possible. In the case of sour cherries, these would include the varieties "Morellenfeuer", "Gerama", "Safir" and "Morina" as well as "Carnelian", which are considered particularly resistant. In addition to the variety but also the location is of great importance. This should be sunny if possible and free from waterlogging. In addition, mixed cultures can reduce the risk of disease and its spread. In addition, potentially endangered tree species should be regularly screened. In addition, the use of special tonics, which make plants more resistant, can be advised.
Depending on the weather, preventive spraying with fungicides may make sense. The same applies in the case of increased risk. For example, if trees in the immediate vicinity already suffer from the Monilia peak drought. However, before using fungicides or other pesticides, it is important to consult the Federal Office of Consumer Protection for their approval and safety for people and nature. In addition, it is unspeakably important to search his orchard regularly for typical diseases.
Resistant sour cherry varieties at a glance:
- 'Morell Fire'
The pathogen Monilia laxa spreads mainly in the spring by the wind, the rain and insects. As soon as he meets flowers, he gets over these into the fruit wood. It should be noted that the flowers do not even have to be fully opened. Once in the wood, the fungus or pathogens release toxins that cause the flowers to wilt. It should be noted that prolonged rain and prolonged flowering due to the temperatures encourage infection, which is why it should be respected at least during a wet and cold spring especially on the first disease symptoms. In addition to withered flowers, these symptoms include withering of the shoot tips and a pale green coloring of the leaves, which gradually become limp from the affected branch before completely withering. After that, the affected branches and twigs start to dry up. In addition, a so-called rubber flow can form during the transition from diseased to healthy wood. Usually the dry parts of plants (flowers, leaves, shoots and twigs) hang on the diseased tree. Nevertheless, the soil should be screened for fallen parts of the plants, as the pathogen can hibernate in these as well as in the parts of the tree remaining on the tree and thereby promote a rapid spread in the next spring.
The fight against lace drought
Once a tree shows the first symptoms of a disease, affected areas should be removed immediately. For this, 15 to 30 cm in the direction of the trunk is cut into healthy wood or sawed. It is important to proceed very carefully, so that if possible no fungal spores get into the air, as they could otherwise affect the wind carried by other plants in the area. Then the cut surfaces should be sealed with tree wax. The clippings must in turn be collected without residue and should ideally be burned. Alternatively, it can also be disposed of as residual waste or buried far away from endangered plants. Although some gardeners are of the opinion that the affected clippings could be composted without hesitation. However, it is not recommended that Monilia laxa spores are so resistant that they can survive even for several years without any problems and thus spread over the compost in the garden other plants could attack.But if you still throw the clippings on the compost pile or in a composter, it should at least be placed in the middle of several layers of other garden waste so that it is exposed to the composting process as long as possible and the possibility exists that the pathogens are killed by the resulting heat become.
Due to the enormous risk of a renewed outbreak and the unpredictably severe consequences that he might eventually have in the entire garden, it must again be explicitly advised not to compost affected parts of plants here. In addition, it is unspeakably important to thoroughly clean the garden tools used for pruning the diseased trees after work as spores of the pathogen could adhere to them, which would increase the risk of further use if used further.
The Monilia fruit rot
The Monilia fruit rot is a very similar to the Monilia lace drought disease, which at least laymen like to consider the same disease. Unlike top drought, the fruit rot is not caused by Monilia laxa, but by a closely related fungus called Monilia fructigena. However, with regard to preventive measures to be taken and measures to curb the spread and disposal of diseased parts of plants, the same principles apply as far as possible.
Worth knowing about Monilia peak drought shortly
Monilia is a fungal genus, a plant pest that mainly attacks fruit trees. There are different types, which are often difficult to distinguish from each other. Monilia can occur as a fruit rot and / or top drought, usually immediately after flowering. Frequently affected are:
- Sweet and sour cherry,
- but also plums
- and almond trees
- infests only injured fruits
- Rotting often starts at feeding points or wounds
- the mushroom grows through the entire fruit
- Characteristic are white fruiting bodies on the milk-coffee-brown, rotten fruit
- Stains are arranged in concentric circles - fruits dry up, but often remain (fruit mummies)
- It is essential to remove infected fruits to prevent them from spreading and transmitting
- Cut branches down to the healthy wood!
- Destroy waste - not on compost!
- the pathogen enters the plant in wet weather over the flowers
- Especially occurs after cool, damp springtime
- especially sour cherries and here especially the popular cherries, but also sweet cherries, apples, apricots and peaches
- causes dying of shoot tips
- At the transition point between infested and healthy wood, a rubber flow may occur
- All affected shoots must be cut back to healthy wood up to 15 cm!
- Seal the wounds with tree wax to prevent new pathogens from entering!
- It is favorable to pay attention to resistant varieties when buying
- important is the right location - it should be sunny and airy, so that existing moisture can dry well
- even good cut promotes quick drying and hinders the spread of the fungus
- Plant tonics have an accident-reducing effect (pay attention to natural remedies!)
- If prevention has not succeeded, pesticides must be used!
- Recommended varieties are: "Duoxo Universal Mushroom-Free" by Compo, "Mushroom-Free Ectivo" by Scotts Celaflor and "Fruit-Mushroom-Free Teldor" by Bayer.
- It is favorable to call the respective plant protection office in the own federal state and to ask for suitable means!
- Only agents that are approved for the control of Manilia laxa or Manilia fructigena in the house or allotment must be used!
- Important is the right time of application!
- In the case of Manilia laxa, it is best to spray several times during flowering!