The London Garden says: " For destroying Moss or Lichen on fruit trees, there is nothing better than lime thinned to the consistency of whitewash, and strained through a fine sieve or thin canvas to exclude all rough sediment. It will then be ready for applying to the trees either by means of a syringe or garden engine. For the destruction of scale and American blight I have tried many insecticides, but have found nothing better nor so cheap as soft soap and paraffin oil prepared in the following manner: to make four gallons of the mixture, take half a pound of soap and half a pint of paraffin; place them in a bucket or other suitable vessel, and add two to three quarts of boiling water; stir the mixture until the soap is dissolved, and then add the remainder of the water. This mixture may be applied by means or a syringe in the following manner : Draw up a syringeful and discharge it into the bucket, and when the mixture is agitated draw up another and apply it to the tree. As American blight winters in the soil underneath the trees, it would be advisable to have the soil removed from under affected trees to a safe distance and burned, so as to entirely eradicate the insect".