Has our lemon been mildewed?
Q My grandson’s lemon tree in the lounge is developing white leaves, as though it has mildew. Is this possible? Mrs P Ransom, Bexhill-on-Sea, East Sussex
A Mildew is easy to deal with. Plants that are growing in humid air conditions and are dry at the roots are most vulnerable. If the lemon tree is in a warm living room, it is likely to need more water.
To restore the plant to good health, it might be worth removing the worst affected leaves so they are not a source of infection for the plant.
When watering, try not to get water on the leaves as this will encourage fungal growth. It may also be worth spraying with a fungicide if the infection is bad.
Lemons in warm rooms need generous watering