Prevent Rose Pests and Diseases

Posted in Caring For Your Roses, Prevent Rose Pests And Diseases, Rose Growing Tips

The very best way to avoid rose diseases is to plant varieties that are disease resistant.  That’s what we want:  low maintenance, easy care roses …

NatriaIn recent years I stopped spraying my roses with chemicals…for the sake of our health and our dog friends.

I now use organic sprays, homemade tonics, and enlist the help of beneficial bugs to keep my roses humming and strumming.  I like the Bayer Advanced non-synthetic Natria line, especially the Insect-Disease-Mite spray …

Also, good cultural care can reduce the number of challenges your roses will present each season …  

Disease prevention starts at pruning time.  A well-pruned rose resists disease much better than one that has winter-damaged wood or lots of twiggy growth in the center of the bush. Pruning time also presents an opportunity to clean up fallen leaves that can harbor disease.

Follow these tips for healthy roses:

* Select disease-resistant varieties

* Follow good pruning practices

* Do not over fertilize

* Encourage beneficial insects

* Avoid working around roses when their leaves are wet

* Promptly remove any leaves that are infected

How To Prevent Black Spot

Roses Black Spot

Black Spot Disease

Black Spot is a fungal disease that can run rampant on wet foliage. Black spots can develop on the leaves (especially lower leaves), which then turn yellow and eventually drop off. This stresses the rose and weakens it …

To prevent black spot, start a spray program as soon as the leaves emerge in spring using an organic rose spray labeled for black spot.  Adjust your watering so that you do not wet the leaves of your plant late in the day.  

Try and water the base of the plant, preferably with a slow stream using a soaker hose.

Of course, you  have no control over when rain might fall, and it is inevitable that your rose leaves will get wet at night.  Garden sanitation is important, as black spot spores persist in fallen leaves.

I’ve also used a homemade “Black Spot Tonic” that helps prevent this scourge of rosedom.  Here’ the recipe:

– 1 tbsp. of baking soda
– 1 tbsp. of vegetable oil
– 1 tbsp. of dish washing liquid
– 1 gallon of water

Mix all the above in an empty milk jug then pour some of the concoction in a clean spray bottle.

If you do see signs of black spot on your roses, the first thing you need to do is cut off and destroy all of the infected leaves. Then, when you first start to see the spots appear, apply a fungicide that is safe for use on roses, and is labeled o treat black spot. This should heal your roses, and help prevent future outbreaks …

Dealing with Powdery Mildew

Powdery Mildew

Powdery Mildew

Powdery Mildew is a fungus that needs hot, humid days and cool nights to flourish… so it usually occurs later in the season. It will crinkle and discolor new growth, which appears a dusty white …

The most effective way to prevent powdery mildew is to provide good air circulation around your roses.  Since infections appear first at the top of the plant, it is easy to cut away the most severely infected areas with no harm at all done to the rest of the plant …

Combating Aphids, Mites and Thrips

Aphids are tiny insects found in large groups on the tender rose shoots. Spray aphids with shots of water to knock them off the rose. Inspect regularly to check that they haven’t returned …

Mites are very small insects that live on the underside of the leaves. They breed quickly in warm weather. Spray them with water to knock them off, checking frequently to see if they have returned. If the infection is very bad, use and insecticidal soap spray such as those available by the Safer or Bayer Advances brands …

Thrips are very small insects that feed on buds and flowers. They can be thwarted using an insecticidal soap as well.

Eliminating Japanese Beetles

Japanese Beetle

These shiny fluorescent green beetles appear in July in the Midwest. Their larvae live in well-watered lawns and garden beds for over 10 months of the year. (Eggs are laid beneath the plants that the beetles feed on) The best way to remove them is to pick them off by hand and drop into a bucket or coffee can of soapy water. The soap prevents them from flying away …

If you are squeamish of bugs, just wear rubber gloves so you aren’t directly touching them. You can also treat your lawn and garden soil with parasitic nematodes, milky spore or chemicals made for grub control …

Pin It