Each lot of seed stock found to contain annual bluegrass must be placed under "stop sale" to be released only for shipment out of the quarantine area or for planting in nurseries of two acres or less under the supervision of, and approved by, an agent of the department of agriculture. The nursery must be seeded in rows. It is the duty of the person receiving seed stock containing annual bluegrass to rogue this increase area or chemically treat to eradicate the annual bluegrass thus assuring production of seed that is free of annual bluegrass. Seed increase areas are inspected by the department at least three times during the seedling year. Any areas not passing inspection must not be harvested, but instead destroyed by the person who planted the increase area upon order of the director of the Washington state department of agriculture or his agent. If not destroyed as directed, the department of agriculture may have the plot destroyed and the grower is liable for all expenses.