Mould Dust on Beans: How to Control Mould Dust on Beans

If you grow roses, you probably know about the dusty white fungus that attacks the leaves, flowers and stems of plants. This powdery mildew attacks many types of plants, including beans. Not only is it unsightly, but it can ruin your crop, reducing your yield. However, powdery mildew in bean plants can be controlled and even prevented. If you see even the first sign of bean plants with powdery mildew, it’s time to take action and take steps to prevent the spread of the fungal disease.

Recognition of powdery mildew bean plants

Powdery mildew comes from the Erysiphe or Sphaerotheca fungi. It doesn’t matter which fungus causes the damage when your crop is at stake. Treating powdery mildew in beans from either fungus requires the same method. Early control is essential because the fungus spreads quickly in hot, humid conditions and can literally decimate your bean crop. Recognizing powdery mildew in beans can protect your crop and prevent the spread of this fungus problem to your other vegetables.

Powdery mildew in beans is one

a common occurrence that should have its own brand. This fungus produces fruiting bodies in warm, moist conditions that spread to all parts of the plant and appear as a white ash powder.

Most powdery mildew is present in legumes and cucurbits in the crop category, although it also affects citrus and other crops. Once the spores are present and the conditions are right, the fungus spreads rapidly to epidemic proportions. Prevention of powdery mildew in beans is a crucial step in maintaining a bumper crop.

Mould Dust Control on Beans

A few cultivation measures can help prevent powdery mildew bean plants.

  • Avoid high watering as much as possible.
  • Water early enough in the day to allow the sun to dry the leaves and stems.
  • Support the rise of the beans and give them good air circulation. Overcrowded plants are more likely to acquire the fungus.
  • The spores will overwinter in most areas, so it is important to clean affected plant material at the end of the season.
  • Make sure the plants are well fed and watered so that they can withstand a late season disease attack if it occurs.
  • If you have roses or other ornamentals nearby that have the disease, spray them with a copper fungicide.

It is difficult to treat powdery mildew in beans and other edible crops. Many products labelled for this control are not suitable for edible plants. Diluted compost tea (per 4 parts water) can provide some control without any toxicity.

If you have plants that regularly develop powdery mildew, apply a preventive fungicide early in the plant’s development. That is, before the flowers and fruits. Avoid eradicating fungicides, which kill existing diseases but can contaminate the fruit. Apply sulphur early in the season to protect plants from infection.

In case of existing infection, use a natural vegetable oil such as neem or jojoba oil. Finally, there are some biological controls in the form of beneficial microorganisms that fight powdery mildew. Look for products containing Bacillus subtilus, the only non-toxic organism that prevents powdery mildew.

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