Dahlias are quite enjoyable flowers as they come in a variety of bright, vibrant colors. They will also continue to flower all summer long. However, just like any other plant, they can be vulnerable to pests - particularly aphids.
What are Aphids?
Aphids are small insects that enjoy the newer growth on plants, green or black aphids being the most common. They typically are attracted to fruit and shade trees but can also be found in flower and vegetable gardens as well.
Noticing only a few aphids on the plant is the earliest sign of an infestation. As their numbers begin to grow, they will begin to cover the surface area of the plant. It's important to get rid of an aphid problem at the earliest of stages because aphids can reproduce very quickly.
Aphids feed on the plant fluids causing them to become dehydrated. They can also transfer plant disease in the process. They then secrete a liquid waste referred to as "honey dew" which can be seen as a shiny, sticky substance on the surface of the leaves.
Signs of aphid damage include spotty, yellow discolorations on leaves and the leaves may dry out, wilt or curl. "Honey dew" liquid waste may also become evident.
Tips for Getting Rid of Aphids on Dahlias
According to GardenWeb there are many cures for aphids. The most popular method of getting rid of aphids is to blast the affected flowers with a strong stream of water from the hose. Just be careful not to use too much pressure or the flower blooms can become damaged. Aphids attach themselves to the plant using their mouths. When high pressure water hits them they release and are washed away. Complete this regularly to serve as an effective method of aphid pest control.
With a large infestation, trimming away parts of the plant with the most aphids may be necessary to prevent them from spreading. Running your fingers up the stems of the plant and squishing the aphids is also a very basic yet effective method for removing aphids.
With Dahlias it's important not to over-fertilize because aphids are very attracted to a plethora of new plant growth. Thus if the Dahlias are growing very quickly so will the aphid population. Be sure to use a slow, time-release plant fertilizer containing low to moderate amounts of nitrogen.
A home remedy for getting rid of aphids is to mix a small amount of dish soap into a bucket of water. 1 to 2 tablespoons of soap per gallon of water is about right. Spread the sudsy mixture up and down the stems of the affected plant. Try the mixture on a section of the plant first to see how it tolerates the soap. The soap leaves the stems sticky which is unappealing to aphids.
If all else fails, insecticidal soaps and chemical pesticides work extremely effectively against aphid infestations. They can be found at any local garden center. Simply follow the instructions on the label. There should be some natural, non-toxic remedies for removing aphids at the local store as well for those that are more environmentally-friendly.
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