It is impossible for anyone to keep really up to date with the increasing number of new chemicals sold in so many formulations and combinations under such a bewildering array of brand names. Even as I have been writing these pages I have been constantly changing the text to agree with recent information. I can't even remember what I have already written without checking back from time to time; so I certainly don't expect you to remember all you read here. This text is for reference when you need it. For most garden enemies there are several possible chemicals that can be used for control, and it is your job to choose one of these from the dealer's shelf. Every label has been registered with the U.S. Department of Agriculture and contains either the chemical name of the active ingredient or the coined common name, with directions for use and safety precautions. You must learn to read this label carefully; claims made on it have been verified.

Advertisements are not registered, seldom name the active ingredient, and often need to be taken with more than a grain of salt. If too flam boyant statements are made, the Better Business Bureau sometimes gets busy, but there is a time lag. Learn to read the label!

The list presented here gives most of the chemicals mentioned in the text and a sampling of trade names, the latter in italics. In some cases the trade name is the only one we have to replace the long chemical name. In other cases a common name has been coined, but we have become too used to the trade name to change easily. Most of us think in terms of Fermate rather than ferbam, of Parzate or Dithane Z-78 rather than zineb.

There is no mention here of Krilium and other soil conditioners even though problem soil might properly be considered a garden enemy, nor of herbicides which require a book to themselves, nor of the new growth inhibitor maleic hydracide, nor of fertilizers which can be applied to foli age along with pesticides, nor of rodenticides. The list includes insecti cides and fungicides only, and even these are limited to chemicals likely to be used in modern home gardening.

Acti-dione (cycloheximide, an antibiotic, product of Streptomyces gri seus). Promising in control of rose mildew, usually in greenhouses, for cherry leaf spot, and, combined with ferrous sulfate, for certain turf diseases. The Upjohn Company, Kalamazoo, Mich.