Mimosa and honey locust trees in this area are likely to be attacked by mimosa webworms. It is time to start watching for them and to spray if necessary.

The small worms web the leaves together and turn them gray. Mimosa flowers also are ruined. The leaves of honey locust and moraine locust turn rusty brown.

There are two generations a year, with webworms present from June until frost. Usually the greatest damage comes in July.

For control of webworms, specialists recommend spraying with Sevin or Spectracide. A second spray may be necessary three weeks later. Directions on the label should be followed closely.

Walnut fever is attacking many home owners this year, says Robert Touse, Ohio State University specialist in wood utilization. The chief sympton, he says is a sudden urge to strike it rich in the backyard.

Dozens of walnut tree owners have called hoping that their tree - or perhaps two or three - may be a money tree in disguise.

Recently one buyer is said to have paid $30,000 for a single walnut tree in northwest Ohio. So owners of walnut trees think their tree may be valuable also.

But the backyard isn't the ideal place to grow lumber or veneer-quality walnut (or other hardwood) logs.

Good lumber trees need the competition of other forest trees to grow tall and straight. Also, this competition for a place in the sky causes the tree to shed its lower braches before they make large knots. Backyard trees grow more bushy, with branches spreading outward. Those branches should be at least 20 feet above ground to make useful lumber.

Also, backyard trees may be filled with nails, screws, wires, bolts and other metal. This hardware often results from a lived-in yard with fences, tree huts, and clothes lines attached to the tree.

No timber buyer would tackle backyard trees. Just one spike or bolt might cause hundreds of dollars of damage to milling equipment.

If your lawn grass looks sort of frayed after cutting it with a rotary mower, perhaps the blade needs sharpening. A dull blade will tear or shred the grass instead of cutting it cleanly.

Many gardeners have two blades for their rotary, one to be used while the other is being sharpened. The blade usually needs it three or four times during the growing season. A newly sharpened and balanced blade will cut clean at first, but may soon be dulled by gritty grass blades.

A dull reel-type mower can cause the same kind of damage. However, the blade of a reel mower is not likely to become dull as quickly as that of a rotary because the blade constantly scrapes against the knife which tends to sharpen it.

The appearance of the grass is not all that is involved by mowing with a dull blade. The health of the grass may be seriously affected.

If you are cutting the grass with a dull mower, according to specialists, you are creating more severe wounds that require more wound-healing compounds and therefore more stored food reserves.