CHLORDANE. A complex chlorinated hydrocarbon used as stomach poison, contact insecticide, with some fumigant properties. It is highly effective against ants, grasshoppers, mole crickets, sowbugs, beetle grubs, and mole crickets in lawns, black vine weevils; can be used as a foliage spray for thrips, leaf miners, etc. It is formulated as a 50% wettable pow der used at rate of 1/8 teaspoon per small ant nest, or 2 tablespoons to a gallon (2 pounds to 100 gallons) as a spray. It is also available as a 5% dust, used at rate of 5 pounds per 1000 square feet for grub control. It is sold under many trade names, e.g., Dowklor, Ortho-klor, Synklor.

CHLOROBROMOPROPENE. A soil fumigant of fungicidal value, killing some crown rot sderotia, reducing Verticillium wilt and some root rots but sometimes increasing other diseases by killing beneficial soil organ isms.

C-O-CS (copper oxychloride sulfate, Niagara Chemical Div., Food Ma chinery & Chemical Corp., Middleport, N.Y.). A fixed copper used on vegetables in place of bordeaux mixture; it sometimes injures orna mentals.

CHLOROPICRIN, tear gas, sold as Larvacide. A soil fumigant for nematodes and some fungi, not to be used near living plants. Injections are made 10 inches apart and 6 inches deep with a special applicator, apply ing 1/2 teaspoon per hole.

CINERIN. Synthetic replacement for natural pyrethrum.

Copper 8-quinolinolate. See Bioquin.

COPPER-LIME DUST. A mixture of 20% copper, 80% hydrated lime for use on potatoes, chiefly. This dust is applied when foliage is wet with dew, to make bordeaux mixture on the leaf. Other dusts for ornamentals should be applied to dry plants.

Crag Fruit Fungicide 341 (glyoxalidine acetate, Carbide & Carbon Chem icals Div., 30 E. 42nd St., New York 17, N.Y.). Effective for apple scab and cherry leaf spot.

CRYOLITE (sodium fluoalumtnate). Used more in the South, mostly for vegetable crops, sometimes for Diabrotica and blister beetles on ornamentals.

CUBE. Plant used as a source of rotenone.

Cyanogas (calcium cyanide, American Cyanamid Co., 30 Rockefeller Plaza, New York 20, N.Y.). Various formulations are used for fumigating greenhouses, killing ants, woodchucks, etc. Very poisonous.

D-D. (1,2-dichloropropane and 1,3-dichloropropylene, Shell Chemical Corp., 50 W. 50th St., New York 20, N.Y.). Soil fumigant for nematodes, good for large-scale operations, since fumes need not be con fined. Injections of 4 to 5 c.c. (3/4 to 1 teaspoon) are made 12 inches apart.

DDD, or TDE,(analog of DDT). Less toxic than DDT to warm blooded animals and fish and also to many insects but superior to DDT for control of mosquito larvae, tomato worms, red-banded leaf roller in orchards. Sold as Rhothane.