Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,398 pages of information and 233,518 images on early companies, their products and the people who designed and built them.
of Wheathampstead, near St. Albans, Herts. Telephone: Wheathampstead 2177-8. Cables: "Alvesco, Wheathampstead"
1947 British Industries Fair Advert as Manufacturers of Agricultural and Horticultural Insecticides, Fungicides and Fumigants. Winter Washes containing Tar-oil, Petroleum Oil, D.N.C.-Petroleum and Thiocyanate-Petroleum. De-De-Tane D.D.T. Insecticides. Sulphur and Copper Fungicides. Oil Emulsions. Spray Spreaders. (Chemicals etc. Section - Olympia, Ground Floor, Stand No. A.1131) 
1963 and 1966 Foldout charts for the identification and control of garden pests, diseases and weeds. 
1977 Glaxo sold the company to Dalgety.