1.low fat milk 1:10 water-----spray.on plants with black spots (rose) 2.1 l water+ 1.5 neem oil + i tsp hand wash or shampoo mi.x well and spray for all insect infestations. add 2-3 drops of rosemary oil to make a stronger solution 3.ice cold water kills aphids...hibicus 4. Camphor oil 4-5 drops + 1 small glass of water ..mix and spray to keep off mosquitoes