Content
- Diseases and pests in beans
- Bean mosaic virus
- Halo blight
- Anthracnose
- bean rust
- Black bean aphid
- bean fly
- snails
- Tips & Tricks
Diseases and pests in beans
Pests such as bean fly and bean aphid endanger the growth of bean plants. Diseases such as bean mosaic virus, greasy spot disease, burn spot disease and bean rust can even lead to the death of entire plants and thus to crop losses and crop failure. That does not have to be!
Bean mosaic virus
The virus disease indicates yellowish, mosaic-like spots on the leaves. Leaves turn yellow and die, in the worst case the whole plant starts.
Cause of the infestation is already infected seed. Aphids transmit the virus to neighboring plants and heat promotes their spread. Infected plants can be disposed of through the compost.
Prevention:
Halo blight
It mainly attacks bush and fire beans and is triggered by bacteria. The leaves show small yellow to light green, oily spots. The leaves deform and die, often before flowering. In addition, pods, stems and seeds may be affected.
Cause are infected seeds, infested plant remains and the spread by snails.
fighting:
Anthracnose
In this fungal disease leaves, stems and pods are covered by dark, burnt-looking patches. In heavy infestation, the leaves are thrown off. If the fungus infects the seedlings, young plants are already threatened with extinction. Above all bush beans are endangered.
fighting:
bean rust
The fungal disease occurs in wet weather and is recognizable by white pustules on the underside of leaves and on pods. Cause are unnecessary nitrogen fertilization and close juxtaposition of the plants.
fighting:
Black bean aphid
The approx. 2 mm black bean aphid can be recognized by its yellow antennae and legs. It attacks leaf undersides and shoot tips and leaves them crippling. The black bean aphid overwinters in the ground or on host plants such as the snowball and attacks the plant in May.
fighting:
bean fly
Holes in the bean seeds and feeding sites on cotyledons and root necks indicate infestation by the 4-5 mm gray bean fly. She lays her eggs in bean seeds and seedlings from April to May, her larvae feed on the cotyledons.
Prevention:
snails
Especially seedlings and young bean plants are a treat for snails. To protect the plants, slug pellets should be sprinkled. Also helpful is the preference, the growth advantage, the plants are less susceptible.
Tips & Tricks
Picking beans in dry weather reduces the risk of infection to neighboring plants. Picking may result in bruising and damage that acts as a portal of entry for spores and bacteria. Their propagation would be promoted by wet weather.