Lawn weed control
It's a must to apply chemicals at the recommended rate in a weed control program. The margin of chance between effectiveness in killing weeds and injury to lawn grasses is not usually great. For example, if you apply half the recommended rate of most herbicides, poor weed control will result. If, on the other hand, you apply two to three times as much as recommended, there will be heavy damage to turf grasses.
There are many ways to apply herbicides. With granular materials, you can use a fertilizer spreader. Spread half the weed killer in one direction and the other half in the other direction, in checkerboard style at right angles to the first application. There will not be as many skips or misses, and it will cover better.
Although most chemical labels contain spreader settings, it pays to carefully calibrate the chemical on a weight basis. Once the applicator has been set for the right amount of material to come out, it's advisable to write down details of the procedure for later use. Liquids are normally mixed with water and applied as a spray.
For mixing small amounts of herbicides, fungicides or insecticides, here are rough estimates: When recommendations call for a pound of wettable powder in 100 gallons of water, use 1 level tablespoon per gallon of water. Two pounds per 100 gallons equals 2 tablespoons per gallon. For each pint of liquid in 100 gallons of water, use one level teaspoon per gallon.
Plants such as roses, chrysanthemums, and others, which are subject to leafspot diseases, should already have had last year's mulch and fallen leaves removed, and new mulch should have been applied. Use either sprays or dusts to control diseases. Insects such as thrips and aphids often are a problem on new growth.