Boxwood Blight Disease Identified in Michigan.
May 31, This leaf drop is caused by the feeding of maple petiole borers, Caulocampus acericaulis. Petiole borers are small insects called sawflies, which are non-stinging wasps.
The sawfly is only about 1/6 of an inch long and emerges from the soil in the spring to mate and lay eggs near the base of the petiole of maple treehaul.clubted Reading Time: 2 mins. Jul 09, Both anthracnose and maple leaf blister can be the cause of late spring and early summer damage to leaves of these popular landscape trees. Anthracnose is a common spring disease on maple trees common in the landscape including red (Acer rubrum), silver (Acer saccharinum), sugar (Acer saccharum) and Japanese (Acer palmatum) treehaul.clubted Reading Time: 4 mins.
May 30, When maples suddenly drop their leaves in June or July, it's usually due to drought, a sudden change in temperature or insects like scale, aphids or a specific wasp larva that burrows into the leaf petioles.
When the trees are stressed by drought or sucking insects like aphids, the leaves will turn yellow or brown before dropping. Apr 12, There could be several reasons for leaf drop, but the most likely cause may be the leaf stalk borer or petiole borer. Both insects burrow into the leaf petiole in the spring, causing the leaves to. Jul 27, Holly shrubs normally shed some leaves each spring. They grow new leaves and discard the older leaves when they are no longer needed.
Loss of older leaves to make room for the new season’s growth is common among many evergreens, including both broadleaf and coniferous trees and shrubs. If a plant is stressed, it may shed more leaves than usual during its annual leaf drop, creating.