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M. malathion. m. m. m. malathion. 2. Corn. - PARKIN (1958) reported that in a collaborative experiment between the Grain Marketing Board, Southern Rhodesia, the Colonial Products Laboratory, London, and the Pest Infestation Laboratory, Slough, that no contamination could be detected chemically in samples of maize taken after three months' storage of a bag stack, each layer of which was treated during construction with 50 mg. of malathion/sq. ft. 2) as a waterdispersible powder. WOMACK and LAHUE (1959) determined the effectiveness of malathion emulsion sprays in protecting shelled corn from insect attack during an eightmonth storage period from May to February.

BRIDGES (1958 a) using HC-labelled gamma-benzene hexachloride found that gamma-benzene hexachloride penetrates more rapidly into Stilton cheese than into Cheddar cheese. Contamination is confined to a depth of one em. or less below the surface after a 44-week period of storage. Repeated applications of the insecticide cause a build-up of the residue in the outer few mm. of the cheese. m. was found. Loss of gamma-benzene hexachloride from the cheese is very slow, 40 percent of the initial dose remaining in the cheese after 44 weeks' storage.

M. 5 days. m. in the diet of growing chickens fed for 10 weeks did not produce any effect on mortality, weight gain or feed conversion; in the diet of laying hens it did not affect egg production, mortality, egg size, albumin, quality, or incidence of blood spots. Yolk color of eggs from birds receiving malathion was more intense than in controls. m. malathion hatched as well as eggs from control pullets, and there were no differences in number of chickens culled at hatching, sex ratio or mortality of chicks after hatching.

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