AEROSOLS. Sprays, usually insecticides, dispensed in very fine droplets from metal containers ("bombs") in which the active ingredient is dis solved in a liquified gas. Most aerosols are prepared for use in commercial greenhouses, often containing deadly parathion or TEPP and applied with special gas masks, or for large-scale outdoor application by mist blowers, but now there are handy small "bombs" for house plants or the small conservatory. See DX Aero-Spray, Antrol Rose Spray Flower Bomb.

ALDRIN (hexachloro-hexahydro-dimethanonaphthalene). A chlorinated hy dro-carbon widely used in grasshopper control, becoming important for control of leaf miners, weevils, grubs, and maggots in soil, and many other pests. Poison, follow safety precautions.

ALUMINUM SULFATE. Sometimes used for acidifying soil, may be toxic to plants; do not use over 5 pounds per 100 square feet.

AMMONIUM SULFATE. For phymatotrichum root rot make a basin around tree or shrub and apply 1 pound for each 10 square feet; fill basin with water.

ANTIBIOTIC. A substance derived from one living organism to destroy another.

Aramite-15W (an alkyl aryl sulfite, U.S. Rubber Co., Naugatuck, Conn.). An excellent new miticide, relatively non-toxic to man and plants, that can be used alone or added to combination sprays to control red spiders on roses and other ornamentals, boxwood mite, spruce mite on evergreens, etc. Use 1 tablespoon per gallon.

Antrol Rose Spray Flower Bomb (lindane, rotenone aerosol, Boyle-Mid- way, Inc., 22 E. Fortieth St., New York 16, N.Y.). Useful for thrips and beetles on rose blooms, aphids on house plants, etc.

Arasan (tetramethyl thiuram disulfide, E. I. du Pont de Nemours & Co., Wilmington, Del.). A seed protectant to prevent damping-off and some other diseases; usual dosage 1/2 teaspoon per pound of seed.

BENZENE HEXACHLORIDE (hexachlorocyclohexane). Effective against wire worms and other soil pests but imparts objectionable flavor to food crops. The purified gamma isomer is better. See lindane.

BICHLORIDE OF MERCURY (mercuric chloride, corrosive sublimate). Used in 1 to 1000 dilution, two 7-grain tablets to 1 quart of water, for disinfecting iris rhizomes after soft rot, pouring on soil in cases of crown rot. Violent poison, do not swallow.

Bioquin 50W (copper 8-quinolinolate, Monsanto Chemical Co., St. Louis, Mo.). A green copper fungicide effective for some fruit diseases, rose mildew.

Black Leaf 40 (nicotine sulfate 40%, Tobacco By-Products & Chemical Corp., Louisville, Ky.). A very old and still excellent contact in secticide, especially for aphids. Use 1 to 11/2 teaspoons to 1 gallon of water and 1 ounce liquid soap or 1 heaping tablespoon soap flakes.