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Signs - Presence of the Insect or Insect-related Products on Plants

Honeydew and subsequent sooty mold

  • Aphids
  • Mealybugs
  • Soft scales
  • Psyllids 
  • Leafhoppers
  • Whiteflies

Fecal specks on leaves  

  • Lace bugs  
  • Greenhouse thrips   
  • Some leaf beetles   
  • Some plant bugs   
  • Some sawfly larvae      

Tents, webs, and silken mats  

  • Tent caterpillars  
  • Leaftiers   
  • Webworms  

Bags and Cases  

  • Bagworms  
  • Casebearers    

Spittle  

  • Spittlebugs     

Cottony fibrous materials  

  • Adelgids
  • Some scales
  • Mealybugs
  • Some whiteflies 
  • Some aphids
  • Flatids

Slime  

  • Snails  
  • Slugs     

Pitch tubes  

  • Some bark beetles  

Pitch or gum masses and sap flow  

  • Larvae of some moths  
  • Larvae of some beetles   
  • Larvae of some midges