. Cockroaches How to control arthropods; entomology. Ronnel: 2-percent oil solution or water emulsion. (See "Resistant Roaches," page 6.) These insecticides kill the cock- roaches present, and all except pyrethrum leave a residue on the treated surface. The residue does not keep cockroaches out, but those that come in contact with it are killed. A single treatment in the right places gives protection for several weeks. A liquid insecticide is often the best for use in the home. A dust or water-base spray may be used when there is danger of fire from oil-base liquids. Both a li
. Cockroaches How to control arthropods; entomology. Ronnel: 2-percent oil solution or water emulsion. (See "Resistant Roaches," page 6.) These insecticides kill the cock- roaches present, and all except pyrethrum leave a residue on the treated surface. The residue does not keep cockroaches out, but those that come in contact with it are killed. A single treatment in the right places gives protection for several weeks. A liquid insecticide is often the best for use in the home. A dust or water-base spray may be used when there is danger of fire from oil-base liquids. Both a liquid and a dust may be used when cockroaches are abundant, difficult to control, or firmly established. Baygon, trichlorfon (Dipterex), and fenthion (Entex) are effective, but application of trichlorfon and fenthion is limited to spot treatment by professional pest-control opera- tors. APPLICATION Whether spray or dust is used, treatment should be limited to base- boards, cracks, and places where roaches hide. Spray Apply a liquid insecticide with an ordinary household plunger- Mention of a proprietary product in this publication does not constitute a guarantee or warranty of the product by the Department of Agriculture and does not imply its approval by the Depart- ment to the exclusion of other products that may also be suitable. *r. BN-2288 Female Australian cockroach. (IV2 times natural size.) type sprayer that produces a coarse spray to wet the surface being treated. If the mist is too fine, it will float away in the air. Apply enough spray to moisten surfaces thor- oughly, but not so much that the liquid begins to drip or run. Professional pest-control opera- tors may use larger sprayers, but should make spot treatments only. A paintbrush may be used for applying the liquids in cracks or along baseboards. Dust Apply an insecticide dust with a puff duster of the bulb, plunger, or bellows type. Blow the dust into hiding places that are hard to reach with a spray and on
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