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Leaf fall sickness sounds like a frightening attack that causes the defoliated currant to die off from photosynthesis, but a robust currant actually laughs at infestation with the leaf fall fungus. Rippling disease sounds better, but actually means a completely different disease, and the "leaf behavior" of the currant is not well described with this term. All these details are explained in the article, but above all you will learn why the leaf fall disease of currants is not one of the diseases that will cause you major problems:
Symptoms and confusionThe fact that leaf fall sickness is also called "ruffling disease" can lead to the first confusion, because this name is reserved for the fungus Taphrina deformans, which drives only on (too wet cultivated, false varieties of) peach, nectarine and almond trees mischief.
If the leaves are more uniformly yellow than spotty, the (new) gardener should first check something quite banal: Was the soil around the root of the currant perhaps not enough watered? Is it too light, sandy, permeable to water, allowing rain / irrigation water to pass easily? Leaves also turn yellow due to a lack of water.
The leaf fall disease bulges, curls, does not necessarily roll the leaves. It is much safer to recognize the conspicuous yellowish, sometimes brownish-black dots / spots on the leaf tops. These appear usually first on the leaves of the lower shrub parts, sharply demarcated or with flowing outline.
None of the other diseases more commonly seen in currant and co.
- Currant: bladder louse, aphids, sawfly, powdery mildew, gall mite, gallmidge, rust, bud bite
- Gooseberry: (leaffall disease), powdery mildew, gooseberry wasp, spider mites
Leaf stain makes otherwise only the rust fungus Cronartium ribicola, significantly lighter than the spots of the leaf fall fungus and quite yellow. However, this rust fungus mainly affects blackcurrants and these only when they grow near five-needle pine species such as strobes or pine pines (on which he forms the life stages that can colonize redcurrants). The likelihood of confusion is therefore low, but would also be uncritical because the rust fungus in the home garden is fought identical.
Infested plantsThe fungus Drepanopeziza ribis infests only Ribis plants, of which the following are common in our gardens:
- Red currant Ribes rubrum (including white currant, a white variety of Ribes rubrum)
- Blackcurrant Ribes nigrum
- Gooseberry, Crossing Gooseberry Ribes uva-crispa x "Hairy Gooseberry" Ribes hirtellum
- Jostabeere Ribes × nidigrolaria, blackcurrant, gooseberry and Oregon gooseberry hybrid
What would remain a problem of commercial fruit growing and the customer buying this fruit (under which no one has to classify, for example, the mundraub.org helps against the frequently mentioned price argument, there you will get reasonably free fruit), if, for. B. Hausgärtner by cultivation of their own fruit trees and bushes could fully evade this aberration. But they can not, at least not if they relate their plants in the mass trade (garden center, hardware store, discounters), because there are sold to home gardeners in large quantities exactly the disease-prone modern breeding varieties, the commercial fruit growing with only one or two spray sprays per Season over the rounds and fruit development brings.
If buying "resistant varieties" is advised, this does not necessarily solve the problem. These are varieties that were initially genetically depleted and quasi "disease-bred" and are now to be moved by resistance breeding to no longer respond to certain pathogens. The genetic material is thus not richer, which is why it can be assumed that these weak plantlets are soon discovered by other pathogens (in the resistant apple varieties there are already the first resistance breakthroughs).
Therefore, if you are looking for ribs that can not be seriously disturbed by foliar leaf disease and other fungi, you should focus on the term "resistant" reserved for old varieties. The descriptive list of varieties "Shrub berry fruit - red currant, gooseberry, Jostabeere" of the Bundessortenamt (bundessortenamt.de/internet30/index.php?id=31#c71) lists varieties that are considered to be less susceptible to leaf-drop disease and the other two major diseases. Harmful of the currant apply. Come out
- 'Fertödi hosszu'
- 'Maarse's Prominent'
- 'Rode Rebel'
- 'Red Vierländer'
- 'Witte Parel'
Pesticides against leaf fall diseaseThe food monitoring of the latest report on food safety shows how many pesticides leave residues in our food, including pesticides used in commercial cultivation against the leaf-fall fungus (Federal Office of Consumer Protection and Food Safety, 2015).
Because residues of pesticides are found in foods of plant origin (multiple residues in all 25 tested plant foods in 2015, and between 10 and 20 different pesticides in 19 out of 25 foods), the risk posed by pesticides to public health does not allow it, toxic in the home and garden Allow plant protection products against comparatively harmless fungi such as "Drepanopeziza ribis".