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I have never seen one of those here in the US! You could try contacting your local agricultural extensions on an ID for this insect. I can, however, offer some articles to help you get rid of a broad range of insect pests:
https://www.gardeningknowhow.com/special/organic/what-are-organic-pesticides.htm

https://www.gardeningknowhow.com/special/organic/natural-home-pesticides-organic-garden-pest-control.htm

Unfortunately you have been visited by one of the nastiest foes encountered by any rose loving gardener. They are called Japanese Beetles. It really takes a two pronged approach to do battle with them. Using a systemic insecticide granule that can be scratched into the soils, such as those made by Bayer, will help get rid of the grubs they leave in the soils. A systemic insecticide sprayed upon the roses when the beetles first appear, or slightly before they appear if the timing is known, will also help. I am providing a link to an article I wrote about them for you as well. Nasty bugs they are! Article link: https://www.gardeningknowhow.com/ornamental/flowers/roses/japanese-beetles-roses.htm

Control this time of year when the grasshoppers are mature is difficult. An infestation in fall indicates a likely problem next spring since the grasshoppers lay eggs in the soil in autumn. When they are young, control measures are more effective. What follows contains organic and pesticide control measures. If you can, identify which type of grasshopper has invaded. There are several bug ID sites on the web.
https://www.gardeningknowhow.com/plant-problems/pests/insects/grasshopper-control.htm
http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-2290/EPP-7322web.pdf
The US Southeast suffers from the eastern lubber grasshopper. To see pictures and control information on this species, read this article: http://entnemdept.ufl.edu/creatures/orn/lubber.htm

They are a very beneficial, natural ally in the soil. They don't really like to come out of the soil where they are exposed, but will do so to avoid suffocation from being saturated. In short, they come out when the plant is overwatered, since they would suffocate in the soil.

They do what they are named for, however. They eat rotting material, or fungus. They will not harm living plant matter, but the fact that there are so many would signal an overabundance of fungus in the soil. Usually, fungal infections are caused by overwatering and saturated soil.

First, make sure that you let the soil dry out very thoroughly down to about 2 inches. Do this between every watering. Treat with a fungicide. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

Once the soil contamination is controlled, they will move on to another source of rotting soil, since they will no longer have any food source. Removing them before the soil is treated will lead to further infection, since there is nothing controlling it.

This can, actually, be quite difficult. The recommended method for control is releasing predatory insects, though. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/whitefly-control.htm

The plants themselves can't kill moquitoes. You actually need to rub the oily leaves on your skin for protection. However, some say it does help to grow certain plants. Here is more:

https://www.gardeningknowhow.com/edible/herbs/scented-geranium/mosquito-citronella-geranium-plant.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/mosquito-repelling-plants.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/backyard-mosquito-control.htm