Content
- Rhododendron pests - this is how you drive out the killers
- Aphids suck on young shoots
- Moth sign lice sit and suck on leaf undersides
- Black-weevil beetle walks at night over the leaves
- Countermeasures in weevils and larvae:
- Bugs use rhododendron as a breeding ground
- Countermeasures for bugs:
- Cicadas cause rhododendron buds to die
- Cicadas countermeasures: not the fungus but the cicadas
- Tips & Tricks
Rhododendron pests - this is how you drive out the killers
Rhododendron attract numerous insects. But also pests prefer the plant. What these are and how you effectively combat the pest spirits, you can find out here ...
Aphids suck on young shoots
Aphids are found on young shoots. Her sucking deforms the leaves. At the latest then the pest is visible. In addition, black soot thymes affect the damaged leaves.
Moth sign lice sit and suck on leaf undersides
Moth shield lice or white flies are massively attacking the leaf undersides. If touched, they fly up immediately.
Countermeasures in lice:
Support the natural aphid killers in your garden. Such as wasps, ladybirds, ground beetles, hoverfly and lacewings. Pay attention to the use of insecticides on beneficial insect-friendly products.
Black-weevil beetle walks at night over the leaves
The dark colored, about one centimeter large, dreaded weevil migrates over the leaves at night and nibbles off the edges. Greater danger threatens from the larvae of the beetle. They develop from the eggs in the soil and eat roots, so that the plant dies in a short time.
Countermeasures in weevils and larvae:
Chemical measures use little, since the beetle only comes at night. Distribute rotten boards, tree stumps or old roots between the plants. The beetles hide underneath and you can dispose of them in the morning.
On the other hand, it is promising to fight the larvae in the soil. Threadworms that are easily poured into the soil have proven particularly useful. Note that the threadworms require soil temperatures of at least 10-12 ° C and a uniform soil moisture.
Bugs use rhododendron as a breeding ground
The rhododendron web bug or skin bug lays its eggs on the underside of the upper leaves in late summer. The bugs cover their brood with a visible droplet of black-brown feces. This will give birth to wingless young bugs starting in May. As adult, winged animals they appear in July. Hardy Rhododendron varieties with filiger hair on the undersides of the leaves are spared from the bugs!
Countermeasures for bugs:
The best time to inject to fight the larval offspring is immediately after flowering. Make sure that the undersides of the leaves are thoroughly wetted.
Cicadas cause rhododendron buds to die
What is grass green with striking red stripes on the back? The rhododendron cicadas. From September they lay their eggs in the buds. Dangerous side effect: They transfer the fungal spores of the bud tan. These penetrate into the buds during oviposition. The thus dark colored buds do not fall off, but are covered in the spring with mushroom veils.
Cicadas countermeasures: not the fungus but the cicadas
can be eliminated successfully. Most effective by regular splash of leaf bases early in the morning. As long as the insects are still cold and inactive. Break out the dark, mushy buds from February and dispose of them with the trash.
Tips & Tricks
When using a spray, make sure that the liquid adheres poorly to the smooth rhododendron leaves. Add a few drops of detergent to the spray to drain the water from the surface.