. Nosema-disease. Bees. NOSBMA-DISEASE. 37 RESISTANCE OP NOSEMA APIS TO DIRECT SUNLIGHT. RESISTANCE WHEN DRY. Petri (dishes (fig. 6) which were smeared with the cnished stomachs of Nosema-iofected bees were exposed to the direct rays of the Fig. 6.—Open Petri dish. One-half of the dish, either top or bottom. After intervals reckoned ia hours healthy colonies were inoculated with a suspension made from the dishes which had been 0?:posed. Table XVIII summarizes the experiments and the results obtained. Table XVIII.—Resistance of Nosema apis when dry to direct sunlight. Date of inoculation.
. Nosema-disease. Bees. NOSBMA-DISEASE. 37 RESISTANCE OP NOSEMA APIS TO DIRECT SUNLIGHT. RESISTANCE WHEN DRY. Petri (dishes (fig. 6) which were smeared with the cnished stomachs of Nosema-iofected bees were exposed to the direct rays of the Fig. 6.—Open Petri dish. One-half of the dish, either top or bottom. After intervals reckoned ia hours healthy colonies were inoculated with a suspension made from the dishes which had been 0?:posed. Table XVIII summarizes the experiments and the results obtained. Table XVIII.—Resistance of Nosema apis when dry to direct sunlight. Date of inoculation. Period of exposure to sun. Results of inoculation. Aug. 2, Aug. 21,1914. Aug. 2,1915. July 28,1915. Aug. 27,1914. Aug. 23,1915. Aug. 20,1915. Sept. 2, Aug. 25,1915. Sept. 3, Sept. 14,1915. Aug. 17,1915. Sept. 10,1915. Aug. 19,1915. ,Sep1,. 11,1916. Aug. 24,1914. SSot. 13,1915. Aug. 4,19141. Sept. 16,1915. Hours. 2 5 5 8 10 13 15 16 ,. 17 20 29 15 . ,17 18 21 22 32 ' 34 35 Nosema infection produced. Do; Do. Do. Do. Do. Do. Do. • Do. Do. Do. No infection pi^oduced. Do. Do. Do. Do. Do. , Do. Do. The results in Table XVIII show that ,Noserm apis was destroyed in the experiments recorded ia from 15 to 32 hours' exposure to direct sunlight. It will be readUy appreciated that,the time that Nosemct apis will resist the destructive effects of the sun's rays wiU vary largely accord- ing to .the intensity of the rays, the heat present, ?,nd the thickness of the layer of infective material exposed. ' DESTRDCTION IN WATER. In experiments made for the purpose of determiriitig the time re- quired to destroy Nosema apis suspended in water, an aqueous suspension of the crushed stomachs of about 10 bees was poured into each of a number of Petri dishes (fig. 6) and exposed to the direct. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfe
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwa, booksubjectbees
