Harper's Garden Centre has a great selection of reliable pesticides to defend your garden. Our staff can help you with any issue you have with bugs, mildew, or weeds.

If you want to know why your rose is covered in black spots visit our advice page below.




  • Kills insects on contact; gentle on plants.
  • Potassium salts (insecticidal soap) weaken the insect’s protective outer shell.
  • Pyrethrins attack the insect’s nervous system.



  • Kills insects in all stages of life from eggs to adults.
  • OMRI®-listed and compliant for use in organic gardening.
  • Use on trees, shrubs, fruits, vegetables, flowers, and houseplants.

Slug and Snail


  • Powerful Bait that is highly attractive to slugs and snails. Independent field tests show slugs & snails prefer the bait to plants.
  • Patented formulation works as a contact and stomach poison to ensure feeding stops immediately.
  • Lasts for up to 14 days.

Horticultural Oil


  • Kills scale insects, spider mites whitefly and mealy bug
  • combine with Green Earth liquid lime sulphur for an insecticide/fungicide dormant spray
  • For use on woody ornamentals and shade trees

Diatomaceous Earth


  • Kills a variety of insects ants, earwigs, silver fish, crickets, millipedes, and centipedes.
  • Includes a patented bait formula that kills insects by ingestion/dehydration within 48 hours.
  • Works indoors and outdoors when kept dry.

BTK Biological Catapillar Killer


  • Kills all types of caterpillars and worms
  • Makes over 30 litres of spray.
  • After ingesting the treated portion of the leaf caterpillars stop feeding within a few hours, death occurs in a few days.

Botanical Insect Killer


  • To be used for House Plants, Garden Vegetables, Ornamentals and Flowers
  • All angle 360 degree spray action for ease of use

Kilsol Multi Insect Killer


  • Kills 22 different types of bugs in 1 solution
  • Water Based formulation
  • All angle 360 degree spray action for ease of use

Ant Killer


  • 60 Day Killing Action, Residual Action
  • Kills when insects crawl on treated surface
  • Water Based formulation

Hornet and Wasp Foam


  • For Control of Exposed Nests of Wasps, Yellow Jackets, and Hornets
  •  For use outdoors only to treat nests under eaves, near window frames, doorways, carports, picnic areas, and outdoor play areas or anywhere nests are built.

Hornet and Wasp Spray


  • Non – Staining
  • Kills wasps, yellow jackets, and hornets on contact
  • Gives rapid contact kill and residual kill of wasps and hornets returning to the treated nest 


Lime Sulphur Spray


  • Insecticide and fungicide control for both dormant and growing season.
  • Controls over-wintering disease spores, insect eggs and scale insects on fruit trees, ornamentals and shrubs.
  • Use as a summer spray for diseases on fruit trees, roses and listed ornamentals and shrubs.



  • Controls and prevents black spot, rust, leaf spot and powdery mildew on roses, fruits, and vegetables.

Bordo Spray


  • Controls leaf spots, blights, anthracnose, downy and powdery mildew, black spot, and molds on fruits. 
  • It readily mixes in water for spray application. 

Insect Traps

Japanese Beetle Trap


  • Uses a food and sex attractant to lure insects into the trap and disrupt the mating cycle.
  • Controlled release system maximizes the life of the attractant and protects the attractant from environmental degradation.

Pantry Moth Trap


  • Trap grain moths, flour moths, meal moths, & seed moths with an attractant
  • Non-toxic
  • Long lasting

Tree Tanglefoot Insect Barrier


  • This super- sticky, non-drying compound makes it impossible for pests like cankerworms, gypsy moths and other crawling insects to climb into your trees. 
  • The long- lasting compound works all season long.  


Weed B Gon


  • The formula controls dandelions and other broadleaf weeds without harming your grass.

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