The Washington State University Plant Pest Diagnostic Clinic is dedicated to serving the state of Washington and its citizens through high quality service by providing plant disease and disorder diagnosis, pest identification, and management strategies. The Plant Pest Diagnostic Clinic provides plant health problem diagnosis to homeowners; greenhouse and nursery operations; public and private landowners; and commercial growers including those involved with agriculture, horticulture, and floriculture. In order to pay your invoice please click on the product and enter the dollar amount found on your invoice, add that to your cart then add the invoice number (Specimen #) found on your invoice. You can pay with credit card or electronic check. The WSU Pullman Plant Pest Diagnostic Clinic thanks you so very much for your use of the clinic!