Dictionary of Pesticides

LEAD ARSENATE. A stomach poison still used for many chewing insects in spite of the advent of DDT, for it does not build up mite popu lations. It is used for bagworms, cankerworms, and other caterpillars and many beetles on flowers, shrubs, and shade trees. The usual dosage is 2 or 3 tablespoons to 1 gallon of water; for trees, 3 to 6 pounds per 100 gallons.

LIME-SULFUR. Fungicide and contact insecticide, mostly used as a dor mant spray, 1 part liquid to 9 parts water, for San Jose, rose, juni per, pine needle, and other scales, and 1 to 15 dilution for peach leaf curl. At summer strength, 1 to 50, it controls Volutella blight of box wood.

LINDANE (gamma isomer of benzene hexachloride, at least 99% purity).

The purified form of crude BHC with less disagreeable odor and imparting less objectionable flavor to food crops. A stomach and contact poison good for some aphids, woolly and spruce gall particularly, leaf miners, lace bugs, spittle bugs, some Diabrotica and other beetles, pickle worms, wireworms, maggots, and weevils in soil (although a slight off flavor is given to turnips, radishes, etc.).

Malathon (O,O-dimethyl dithiophosphate of diethyl mercaptosuccinate, American Cyanamid Co., 30 Rockefeller Plaza, New York 20, N.Y.). Another phosphate spray but less toxic to man, released for home garden use in 1953. Experimental tests indicate it is effective for mites, mealybugs, some scales in crawling stage, some aphids.

Manzate (manganese ethylene bisdithio carbamate, E. I. du Pont de Nemours Co., Wilmington, Del.). New fungicide good for early and late blight of potato and tomato and other vegetable diseases, probably brown rot of stone fruits, rose black spot, and possibly mildew.

Marlate (methoxychlor, du Pont).

METALDEHYDE. Used in many slug baits with calcium arsenate, sold as Slug-O, Slug-em, Bug-Geta, etc., or, with chlordane, as Snailicide.

METHOXYCHLOR (dimethoxy-diphenyl dichloroethane). An analog of DDT less toxic to man and animals and some plants and somewhat less effective for most insects but more effective for Mexican bean beetles, fall armyworm, good for plum curculio, blueberry maggots, cranberry and cherry fruitworms, asparagus and cucumber beetles.

METHYL BROMIDE. A soil fumigant that can be used under some conditions to kill nematodes and some fungi near living plants. Balled and potted nursery stock can be treated in special fumigating chambers before shipment.

MISCIBLE OIL. A vegetable or mineral oil readily emulsifiable with water to form a milky white liquid. Usually used for dormant spraying, sold under many trade names: Scalecide, Scale-O, etc. May be unsafe for beech, black walnut, Japanese and sugar maples. Do not use before or after sulfur.

NABAM (disodium ethylene bisdithiocarbamate). See Dithane D-14.




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