They’re baaaaccck!! That’s right, the Japanese beetles are back. What exactly is a Japanese beetle and why should we be concerned? Knowing a little bit about these tiny terrors will help keep your landscape from becoming their next meal. Continue reading
A week devoted to wildflowers is just about as good as a holiday devoted to trees. While Arbor Day is a well-known holiday celebrated across the state, Nebraska Wildflower Week should be celebrated just as much.
Spring is almost here and you know what that means… asparagus season. Asparagus is the favorite perennial vegetable. If you happen to be one that loves this vegetable, you can grow it yourself with a little know how. Continue reading
Spring in Nebraska is a very confusing time of year for most gardeners. We get teased with the nice weather for a few days, only to have snow or cold temperatures snap us back into the reality of living in this wonderful state. There are a few tasks that should be completed in the “spring” of the year, others need to be put on hold for just a little longer. Continue reading
Spooky looking plants have been sighted all across Central Nebraska. Ghostly white peonies and lilac aren’t possessed, they are infected. Find out what is causing this whitish cast to many favorite landscape plants.
We have all been there. It’s the end of the growing season or the beginning of the next and there is this plant whose price is just too good to pass up.
No doubts about it, roses were hit hard this winter. Whether you had hybrid tea roses or the tough-as-nails shrub roses, they all took a beating. Don’t let your roses suffer any more damage this summer, be on the lookout now and catch these common rose problems.
Japanese beetles are a common pest of roses. They will feed on most anything, but they have a love for roses. These insects are related to the May/June beetle and can be a major pest of roses. The immature form of the beetle is a grub that can do some damage to turfgrass. The adults hungrily devour roses and cause the most feeding damage. The front of this beetle is a dark metallic green and the wing covers are a dark tan or coppery color. The main identifying characteristics for these beetles are five small tufts of white hair along each side of the insect. They feed in clusters during the day on leaves or on the blooms. Adult Japanese beetles can cause the leaves to have a skeletonized appearance, ragged holes, or in some instances, the leaves are completely eaten.
Rose chafers are another beetle pest of roses. The adult beetles are slender, 1/2 inch long, and are light tan colored. They lack the tufts of hair that the Japanese beetles have. The long burnt-orange legs are the distinguishing characteristic that sets them apart, as they clumsily walk around. The adults feed on the foliage and flowers of roses, while the larvae feed on roots of grasses and alfalfa. Adults may feed together and can cause skeletonized leaves or ragged holes in the flowers.
There are a few ways that you can control Japanese beetles and rose chafers on roses. If the infestation is light, hand picking is an option. Pick the beetles off in the early morning and drop them in a bucket of soapy water. There are also some deterrents that can be used like neem oil. Several insecticides are labeled for control of these pests with active ingredients like carbaryl, acephate, and chlorpyrifos. Keep in mind that these beetles are mobile and often new beetles take the place of those killed by insecticides. Try to avoid applying the products to the flowers or during times when bees are present because they can harm honeybees.
Some disease names lack imagination. Black spot of roses is one of those. This fungal disease causes the rose leaves to turn yellow then develop black spots, hence the name black spot of roses. The leaves that are affected might fall off, which can affect the appearance of the shrub. It can also reduce plant vigor, cause stunted growth, and increase the chance of winter kill. The fungal spores overwinter on fallen leaves and diseased canes. Rain splash or sprinkler impact easily spreads the spores onto healthy new plant material.
Prevention is the best method for dealing with black spot. Following good sanitation practices like cleaning up rose beds in the fall will make sure to get rid of any old plant debris that could overwinter spores. Replacing old mulch with new, if black spot was a problem in the past in that location, as well as looking for and selecting rose varieties that are resistant to black spot will help to reduce or eliminate the need for a spray program.
Fungicides are another option for black spot control. For best results, most fungicide applications should be applied preventatively to healthy foliage to keep the leaves from becoming infected. Throughout the growing season, infected leaves should be removed as soon as symptoms begin to appear. On plants with a history of black spot, fungicides can begin to be applied as soon as the foliage begins to emerge in the spring and continued throughout the summer. Read and follow label instructions for application and reapplication recommendations. For best results, a fungicide should be used in combination with good cultural and sanitation practices.
With a keen eye, you can catch these issues before they become a pest in your rose bed.
For more information contact Elizabeth Killinger at email@example.com, 308-385-5088, on Facebook, Twitter, her blog at https://huskerhort.wordpress.com/, or visit the University of Nebraska-Lincoln Extension website: hall.unl.edu.