more... > Plant Diagnostic Center > Forms > Plant Diagnostic Sample Submission Form for General Public [Image: Submission Form] Provide all the information required on Plant Diagnostic Sample Submission Form for rapid and accurate diagnosis of plant health problems. Use this form to submit plant disease damage, insect or mite damage or weed identification samples. The completed form must accompany the sample submitted to Plant Diagnostic Center for diagnosis. Nematode Assay Form [Image: Root-knot nematode damage.] Nematode assay form is now available as a fill-in form. It should be included with all samples submitted for nematode analysis.