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Agricultural Control Chemicals - Symposia on Economic by American Chemical Society

By American Chemical Society

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Additional info for Agricultural Control Chemicals - Symposia on Economic Poisons - 115th Ntl. Mtg. San Francisco, March 28 to April 1, 1949, 116th Ntl. Mtg. Atlantic City, September 18 to 23, 1949

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Roaches, of all four common varieties. The Oriental variety comes from outside the plant and invades individually wherever possible b y getting i n through broken screens, open doors, etc. The brown-banded roach has no particular habitat and flies into the plant i n areas where i t is common. The German and American roaches ordinarily come i n with cartons of ingredients. 2. The common ants, particularly the Pharoah and Thief varieties, are common invaders of a bakery. 3. Flies of all types are common invaders.

G . , g . , g . , g . , g . , g . , g . / No. g. wk. g. wk. g. wk. g. wk. g. wk. g. wk. g. wk. g. wk. g. wk. 0 4 6 7 8 14 15 i? ît Λ 3 2 I? §ο 4 72 80 88 Ç 66 226 .. 69 143 .. o? I 222 ? i î f i §g° ψ U% J i ? 2£ί §§2 Î21 22 21? ί } Λ Λί ÎS? 1 9 2 3 9 4 5 413 426 427 9 228 6 5 1 3 0 3 4 7 1 2 4 3 5 3 1 3 5 3 5 2 1 3 3 8 5 1 2 8 3 6 0 1 1 3 3 7 3 1 2 9 3 7 1 1 3 1 4 0 3 8 2 9 3 9 135 117 128 39 5 1 4 2 417 432 434 3 1 2 1 7 9 3 7 2 3 7 6 3 8 149 122 128 9 ο 1 0 4 , ·ν,, ·· Survival · , Λ 7/10 4 11/16 2 0 1 7 1 4 1 9 1 0 1 391 393 398 407 7 14/16 3 4 3 1 3 3 1 3 1 3 3 8 8 1 0 3 9 1 2 3 3 9 3 m ..

R A T S . I n these experiments albino rats of a standard strain were placed i n individual cages with wire-mesh floors elevated above the droppings. Water was offered ad l i b . The basic control diet consisted of a commercial, finely powdered dog meal. Parathion was added to the basic diet b y incorporating carefully prepared parathion dust i n the appropriate quantities. T o ensure thorough mixing, each batch was mixed i n a M c L e l l a n batch mixer. E a c h week the animals were weighed and the food consumed during the previous week was determined.

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