Crabgrass Control
Of all weed-like grasses that infect lawn areas, crabgrass is by far the most troublesome.
Weed young plants by hand if the area is small. Maintain lawn at sufficient height so that young crabgrass seedlings cannot gain a foothold, or use some chemical measure of control, which will either kill the crabgrass or will prevent it from reseeding. An effective chemical method is the application of disodium methyl arsonate (available under various trade names).
The first application should be made early in July; the second a week or 10 days later; and the third application should be in mid-August. The last, or final, application should be made a week later. Applied under favorable conditions (soil moist and temperature moderate), there should be no injury to permanent lawn grasses.
Where soil is dry and temperatures high, serious injury may occur from its use. If soil is dry, it should be watered thoroughly the day before the spraying. Do not spray when the temperature is excessively high, 90 degrees Fahrenheit or more. During hot weather, spray on cloudy days or late in the afternoon to avoid direct sun. Follow manufacturer’s directions.