Technical Abstract: Washington State ranks fourth in the U.S. in both the number of farms growing garlic and harvested acres. Acreage has increased substantially in recent years. Weeds pose the major pest management concern for small- and large-scale garlic growers in Washington. Numerous weed species are troublesome in eastern and western Washington. Among the common annual broadleaf weeds are lambsquarters, Russian thistle kochia, mustards, shepherdspurse, and pigweeds. The most important annual grasses are annual bluegrass and barnyard grass. A number of diseases can be troublesome for Washington garlic growers including, basal rot, blue mold, leaf blight, and neck rot. Viruses, which can reduce yields and quality, are a widespread problem in garlic grown in Washington. While many growers do not treat for diseases or insect pests, herbicides are widely used in conjunction with non-chemical control methods. Garlic growers in Washington state integrate a wide variety of cultural methods into their pest management systems. Field selection, crop rotation, and the use of vigorous, pest-free planting material are critical components for a successful garlic crop. Cultivation is a key component of weed control in all garlic fields in Washington. Some small-scale growers use mulch as a component of their weed control program.