Aphids are pests; thats all they are. Aphids are nuisances that drive us up the wall, leaving pure wreckage in their wake. They are to be taken seriously and not underestimated at any point. In this battle between humans and aphids, size doesnt matter, and aphids are a potent threat.
So what exactly are aphids, and why are there always aphids on roses? Well to begin, aphids are known by several different names: aphids (of course), plant lice, greenflies, whiteflies, blackflies, the list gets a little redundant. Basically, the sundry of names purely indicates the variety with which they come. As of now there is thought to be about 4,400 species of aphids, which are then grouped in 10 families.
Basically, these little buggers suck the sap out of their hosts, which in many cases are roses (hence the name of the page, aphids on roses), cultivated crops, and other leafy delights. Due to the large groups with which they travel, aphids have been known to devastate crops and eliminate natural habitats. Furthermore, their tendency to travel in large packs is perpetuated by the fact that they reproduce asexually. This allows for quick and easy reproduction that allows a group to swell its numbers in a relatively short amount of time.
First off, not all aphid infestations on roses are devastating. Sometimes, if you are lucky, only a few aphids will have taken up residence on your local plants. In such instances, you can literally pick them off one by one. In similar situations, you may also find success with another simple method. Basically, you just take a hose and spray the affected areas. Dont spray too hard as to damage the plants, but hard enough so that the aphids are knocked off. With this method you are literally killing two birds with one stone: protecting your plants from aphids and watering them at the same time.
If these methods fail or just seem futile in the face of large infestations, its time to bring in the heavier artillery. For this method, you need to realize that aphids are closely involved in the nitrogen cycle (as feeders). As a result, you can utilize your handy dandy nitrogen fertilizer. It is imperative, however, that the fertilizer be slow or time- release. This is a fairly effective measure for eliminating aphids on roses.
Lastly, if all else fails, you can always go nuclear on the aphids. Now that might be somewhat over exaggerated from our point of view, but from that of the aphids it is all too true. If nothing else works, it is time to use insecticide on the affected plants. This should be considered a last ditch attempt because such chemicals have been known to be toxic to surrounding organisms and can have unintended consequences on the surrounding environment- with great power comes great responsibility.
Good luck with your aphids on roses.