Plan the perfect garden with our interactive tool →

How to Keep Knockout Roses Insect-Free

stock_photo_of_Knockout_Roses_in_garden

One of the most attractive aspects of growing Knockout roses is their resistance to pests and diseases. Gardeners who grow these beautiful roses have an easier time maintaining them because many of the insects that bother other rose bush varieties do not cause problems for Knockouts. You must stay vigilant against two insects, however, because aphids and Japanese beetles tend to enjoy Knockout roses if you give them the opportunity.

Prune the Knockout rose in the late winter or late spring each year to ensure you remove the dead growth. Look for canes that rub against each other and remove these canes because the rubbed areas can attract pests. Try to keep the center area of the Knockout rose bush free of congested growth to reduce the attraction to pests.

Examine the Knockout rose bush once or twice per week to ensure pests do not get a stronghold. If you find aphids on the stems or Japanese beetles on the blossoms, fill the glass jar half-full of warm water and add two to three drops of dish-washing detergent. Manually pick the insects from the stems and drop them into the jar. Continue picking each day to remove the insects as they appear.

  • One of the most attractive aspects of growing Knockout roses is their resistance to pests and diseases.
  • Try to keep the center area of the Knockout rose bush free of congested growth to reduce the attraction to pests.

Direct a spray of water from the garden hose to areas where insects are congregating. Although some roses are susceptible to water spots, Knockout roses have an inbred ability to withstand water spots so some water on the foliage should not create water spots.

Fertilize your Knockout roses regularly to ensure strong and healthy plants. Mix the fertilizer with water according to package recommendations for the size of your shrub. Pour the fertilizer around the base of the plant every four to six weeks throughout the growing season.

Tip

Some gardeners collect the insects in a jar of water. They allow the insects to soak in the water for one or two days and then drain the water out and pour it into a spray bottle. These gardeners then use the insect water to spray the Knockout rose bushes. The theory is that a water solution made from the remains of these insects will repel other insects from the roses.

Related Articles

Barberry Shrub Insects
Barberry Shrub Insects
How to Get Rid of Aphids on Petunias
How to Get Rid of Aphids on Petunias
Bugs Eating My Butterfly Bushes
Bugs Eating My Butterfly Bushes
Why Are My Geraniums Not Blooming?
Why Are My Geraniums Not Blooming?
Black Spots on Geraniums
Black Spots on Geraniums
My Roses Are Wilting
My Roses Are Wilting
How to Troubleshoot White Spots on Shrubs
How to Troubleshoot White Spots on Shrubs
Gardenia Plant With Leaves Turning Brown
Gardenia Plant With Leaves Turning Brown
How to Clean Roses for Flower Arrangements
How to Clean Roses for Flower Arrangements
What Causes Black Spots on Rose Bush Leaves?
What Causes Black Spots on Rose Bush Leaves?
Growing Roses in Phoenix, AZ
Growing Roses in Phoenix, AZ
Deer-Resistant Gardenias
Deer-Resistant Gardenias
How to Apply Canola Oil As a Pesticide
How to Apply Canola Oil As a Pesticide
What Feeds on a Weeping Willow?
What Feeds on a Weeping Willow?
Pests on Laurel Shrubs
Pests on Laurel Shrubs
Why Does a Rose Petal Edge Turn Brown?
Why Does a Rose Petal Edge Turn Brown?
How to Care for Drooping Rose Bushes
How to Care for Drooping Rose Bushes
Garden Guides
×