O'Kane, W.C., & Conklin, J.G. 1930 Lime sulphur in relation to San José and oyster shell scales.. Technical Bulletin (New Hampshire Agricultural Experiment Station) 40: 1-15.

Notes: Lime-sulphur sprays were able to effect good wetting of the bark of apple, plum, poplar, and sour cherry, and excellent wetting of black currant. Penetration of scales varied from moderately effective (San José and oyster shell) to completely ineffective (waxy scales).