National Association of Landscape Professionals: landscapeprofessionals.org
Texas Sports Turf Managers Association: txstma.org
Texas Turfgrass Association: texasturf.com
Syngenta GreenCast Soil Temperature Maps: greencastonline.com/tools/soil-temperature
Monitor soil temperatures in your area to properly time agronomic activities like pre-emergent and fungicide applications.
Texas Evapotranspiration Network: texaset.tamu.edu
Monitor evapotranspiration rates across Texas to determine plant water requirements in your area.
Greenbook Plant Protection Label Database: greenbook.net
Search thousands of pesticides and their labels in one central location. Able to search by product, active ingredient, target pest, crop type, manufacturer, etc.
Pace Turf Information Center: paceturf.org
Great resource that provides a plethora of information on turfgrass management.
Texas Plant Disease Handbook: plantdiseasehandbook.tamu.edu
Check numerous common disease issues of fruit & nut crops, hardwood trees, ornamental plants, lawn & turf, and forage crops.
Texas Tree MD: texasforestinfo.tamu.edu/treemd
Useful diagnostic tool for many Texas trees.
Texas Turfgrass Maintenance Tips - Video Library: texasgrass.com/texas-turf-maintenance-tips
Useful videos on basic turfgrass management strategies from the Turfgrass Producers of Texas
Texas Oak Wilt: texasoakwilt.org
Great resource on oak wilt from the Texas Forest Service. It contains lots of useful information and literature on oak wilt.