Don’s Expert Answers: Brown spots

Question From:
Tam Luu in Wiley Park , Nsw New South Wales

Nature of problem:
Brown spots

Type of Plant (if known):
Michelia alba

Symptoms of Plant Illness (please try NOT to diagnose your problems yourself):
Brown spots underneath leaves

Soil Type (e.g. sandy, clay or loam) OR Potting Mix Type:
Perlite, peat moss, azalea potting mix, charcoal and gravel

How often do you water the plant:
3 times a week approx

How many hours of sunlight does the plant get each day:

How long since you planted it:
Repotted it 3 weeks ago

Have you fertilised? If so, with what and when:
Potting mix has fertiliser

Is the plant indoors or outdoors:

Is the plant in a pot or in the ground:
Large plastic pot

What other treatments have you given the plant:

Upload photo if available:

Other Comments:
Is it over watering, insect attacks or too much fertiliser or too much sun?
Thank you Don

Hi Tam, It is hard to tell from the photo, but this looks like scale insects. Spray all over the plant and particularly underneath the leaves with Eco Fungicide. this is a totally safe spray. I suspect scale insects since the spots are concentrated around the leaf veins – scale insects suck sap which flows in the veins. You may see no difference until the new growth appears in Spring. Re-spay in December. Don