Control the first generation if you hope to prolong your planting. Mining bees are often numerous in early spring and with the nice weather the last weekend of March they will likely be plentiful. They will not sting unless molested. If you must control them, disturb the soil where they nest to cause maximum nest tunnel damage before applying an insecticide. As the females repair the damage, those that contact enough insecticide will be killed.
Aphids are out already.
We've received reports of roses, covered with aphids. Aphids are usually controlled by beneficial insects. If you need to treat aphid infested plants, try a soap, oil or neem product. If leaves are badly disfigured, use almost any residual insecticide. But realize you will also control the beneficial population.