Question
I have a hardy banna tree i brought in, in a pot for the winter.  The stem part has a dark rust colored spot almost like a bruise and at the base and tips of the leaves are spider webbs with a sugar look alike substance.  Please help i don't want to lose my banna tree.

Answer
Hi Kimberly,

Once a plant is moved outdoors, it is exposed to any number of plant pests that are local to that area. That means there is no way I can possibly know just what critters you may have on your plant.

The bruise may be just that - a bruise from some physical contact. Or it could be a symptom of root rot. It is not likely to have been caused by a pest.

If the webs look like normal spider webs, than they are harmless and can be wiped off. If the webs are very fine, then they may be spider mites.  Spider mites should be treated by spraying all leaf and stem surfaces with a solution of soapy water until they are dripping wet.

The sugar-like substance may be normal plant secretions or may be caused by scale insects or mealybugs. In that case, mix 1 part rubbing alcohol with 5 parts of soap water and thoroughly spray the entire plant.

If your Banana is hardy where you live, then I am not sure why you have moved it indoors. It can be stressful for plants to move them in and out twice every year. It is better to find one suitable location for them and leave them there year round.

Please let me know if any of this is unclear or if you have any additional questions.

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Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC