Would lime sulphur be a good organic alternative to spray on my fruit trees?
Lime sulphur is believed to be the earliest synthetic chemical used as a pesticide and is used in organic gardening. It is sold as a spray for deciduous trees to control fungi bacteria and insects living or dormant on the surface of the bark. Lime sulpher burns leaves so it is not as useful for evergreen plants (It also burns skin too! So use with extreme caution with full protecive clothing). If you do use it then it needs to be applied in the dormant period.