They are either bacteria or bugs.
red maple leaves
you clean it with sanitiser
Plant leaves were brown on the edges and had yellow spots on them
Over-watering may cause the edges to be brown. If there are spots on the leaves, either a chemical or insects may be causing the problem. Wash the plant's leaves (top and bottom) with a mild soap solution and rinse.
Brown spots on the edges of leaves are signs of frost damage.
Aloe vera leaves develop brown spots during winter due to effect of frost
could be lots of things. can you be more specific? where are the spots, how big, what time of year, wet or dry? can you see any bugs on the tree? ect...
that is one of the ways that java fern reproduce, they will form into little leaves ans fall off
There is no way to get rid of the brown spots that appear on leaves of a persimmon tree. This is a symptom of leaf blight disease, and there is a way to prevent it from spreading, if you remove the infected plant matter immediately, but fungicide treatments are not usually warranted to control leaf spot or leaf blight.
A bandicoot is a mottled brown colour.The baby mice were mottled brown, white and black.The bruise was mottled with blue and black.
Tar spot on Maple trees is unsightly, but happens late enough in the season that it does not affect the tree itself. The very best thing to do is clean up and dispose of all the infected leaves on the ground as the fungi will survive the winter and infect other trees.
Magnolias unlike many trees lose their leaves in the springtime. This year my magnolia started to drop leaves in the first week of May when the weather got warmer. black spots on the underside of the leaves can also be seen. Magnolias like lime free soil, so a lime free compost is best.