Black spots on the leaves of your rose bushes, followed by yellow leaves and then bony stems and no leaves? Pull off leaves with black spot. Mix 1/4 cup of skim milk in a gallon of water in your watering can and rinse over the rose bushes, the rose bush will sprout many new growth stalks since it responds to milk just like a good fertilizer. I would repeat this rinse every 4 weeks.
Mosquito Trap: Boil 1 cup water. Stir in 1 cup sugar. Add in 2 cups cold water. Once it's no more than 90degrees, add 1 tsp yeast. Make sure to tape the cut off top inside the body of the 2 liter bottle so the CO2 doesn't escape through the sides. cover in something black (mosquitos are attracted to dark things) and watch it work. Replace the solution every 2 weeks.