Pest (insect) control in hydroponics
  

Insects feed off plants causing leaves to turn pale, drop and then possibly kill the plant. Some insects target and destroy roots (e.g. fungus gnat). They also spread disease from one plant to another via sap transfer.

To detect their presence, routinely inspect both sides of leaves, stems and the medium/ roots using a magnifying glass. Also, “yellow sticky traps” are useful as a forewarning.

If you see insects, act quickly because their numbers multiply rapidly. Isolate the plant if possible and begin treatment immediately. Contact your local growshop for advice on the latest treatment methods.

Common insects found in hydroponic & soil plants

Spider mites:  Tiny spiders appear as pinhead sized yellowish spots.  They feed on sap and their presence is indicated by plants generally looking sick.  They cause mottling of leaves that eventually turn brown and fall off.  The formation of tiny webs indicates the problem is well advanced.

Aphids:  Pear shaped body typically ~2mm long; can be any colour.  They suck sap from leaves causing leaves to curl.

Fungus Gnat:  Appear like tiny fruit fly; ~2mm long; black with 2 wings and antennae.  Their larvae eat root hairs.

Whitefly:  Appear as ~2mm long white flies having 4 wings.  They feed off plant sap causing plants to turn yellow and wilt.  Usually found on the underside of leaves -  gently shake the plant and watch for movement.

Thrips:  Appear 1-3mm long with hairy wings.  They feed off plant sap causing damage to manifest as patches or streaks on the leaves.

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Related topics:

"System & plant maintenance":

General hygiene | Dumping | Flushing root zone | Nutrient disinfection |