The coverage area of 1 envelope of Criterion 75 WSP will depend entirely on the type of pest you are treating and the area that is being treated. Here are some general guidelines:
There are 4 x 1.6 oz water soluble packets in each envelope.
For Turf grass-: 1.6 oz (1 packet) per 8,250 sq ft to 11,000 sq ft.
For Foliar applications of trees, shrubs: 1.6 oz (1 packet) per 300 gal water
For Systemic applications of trees: 1.6 (1 packet) per 24-48 cumulative inches trunk diameter
For Systemic applications of shrubs: 1.6 (1 packet) per 24-48 cumulative feet shrub height