The mimosa in full loom is an attractive small tree with fern-like leaves and slightly fragrant light-pink to rosy-red flowers. Thousands grow in this area. Telephone reports indicate many of them are being attacked by insects.
Tiny slender worms called Mimosa webworms are doing the damage. They also attack honey locust and moraine locust trees. The insects live during the winter in the pupal stage in cocoons located in debris under the tree or under scales of the bark. The adult moths emerge in mid-June and deposit eggs on the foliage.
Larvae (worms) of the first generation appear in late June and early July, a second brood, which is often larger than the first, shows up in August.
A single worm may web two or more leaflets together and it is common for the worms to cooperate and build nests 8 to 12 inches in diameter. Full grown worms drop to the ground on silken threads.
To control them Virginia Tech specialists recommend spraying with Sevin or diazinon when damage first begins to appear.Repeat about a month later to get the second generation. Directions on the label for mix and application should be followeds closely.
If you have a silver maple, don't worry about those little red, green or black warts on the upper surface of the leaves. This is the maple bladder gall and is caused by a tiny mite. No harm will come to the tree. Besides, control measures are effective at this time of the year.
If the new shoots of your red Scotch or Australian pine trees are either distorted or killed, chances are you have a case of European pine shoot moth.
Overwintering worms change to moths during June and the eggs are laid on the pine needles soon after the moths emerge. Eggs hatch in late June and the larvae feed for a whileat the base of the needles before crawling to suitable buds and boring in. Injured buds exude resin which contains a mixture of frass and debris.
The larvae may attack more than one bud but they generally hibernate under a pitch mass, either beside a bud or attached to it. They stay until next April when they become active again.
The insecticide Sevin is effective against this pest but must be applied in mid-April. Jot yourself down a reminder.