Cornell Cooperative Extension

Suffolk County
retaining wall

Retaining walls helping to direct water away from a home.

Diagnosis


Assessing Drainage Problems

Indicator Plants for Site Conditions

Diagnosing Hazard Trees

Do I have Root Rot?

Collecting a Sample To Submit for Diagnosis

Diagnostic Guide for Landscape Plants Exhibiting Nonspecific Symptoms

Drainage, Slopes and Retaining Walls

Quick and Easy Symptom Checker

QuikLeaf Diagnosis Chart

Site Evaluation Form

Last updated July 27, 2026

IPM Factsheets