I have a hedge of waxleaf ligustrum shrubs, approximately 60-70 plants along a coral.* There are oak trees near-by, and the coral is surrounded by a pecan orchard in Texas.* The shrub planting is approximately 8-9 years old and 8 feet tall.** It has been pruned only occasionally, and watered regularly (2-3 times per week)*in the Spring and Summer, but not usually in the winter months, unless during extremely dry periods.* We observed today that there are large (1/2" diam) brown spots on many leaves all along the 100 foot lenght of the shrub.* Many leaves are turning yellow and falling.* Upon closer examination, there appears to be a scale along the stems and miniscule scale-like attachments to the underside of the leaves.* The brown spots do not appear to be alive with spores, as best we can tell.* We cannot see any visible insect activity.* Is this a disease problem or a water or nutrition*issue?* Is this enough information to identify the problem or should I attach a photo?*
Some links to read
Fungi : Leaf Spots
Leaf spots are caused by fungi or bacteria. Brown or black spots and patches may be either ragged or circular, with a water soaked or yellow-edged appearance. Insects, rain, dirty garden tools, or even people can help its spread.
Not much help, but it may lead you to an anwser.
Sounds like you may have scale insects as well as a fungal problem going on.* It sounds like you are watering too much if these are established plants.*
Btw, these plants are considered invasives in Texas, so if this is a new planting, I would recommend you remove them and plant something that isn't invasive.
Ligustrum also get white peach scale.
You can use an organic horticultural oil for the scale insects called Organocide.* It's made from sesame seeds.* Don't confuse it with the synthetic Organicide.* Note the different spelling.