. Airplane dusting in the control of malaria mosquitoes. Mosquitoes Control. Airplane Dusting in Control of Malaria Mosquitoes 13 AN ADDITIONAL CHECK ON THE RESULTS As an additional check on the results of the poisoning in the two completed experiments porcelain pans 11 inches in diameter and containing 10 larvae each were placed at the different stations before the dust was applied and were examined the following day for the percentage killed. (Fig. 8.) On Ex Via Lake all the larvae were dead in seven out of nine pans, whereas, in the other two pans, 5 larvae remained alive in one and 2 in th
. Airplane dusting in the control of malaria mosquitoes. Mosquitoes Control. Airplane Dusting in Control of Malaria Mosquitoes 13 AN ADDITIONAL CHECK ON THE RESULTS As an additional check on the results of the poisoning in the two completed experiments porcelain pans 11 inches in diameter and containing 10 larvae each were placed at the different stations before the dust was applied and were examined the following day for the percentage killed. (Fig. 8.) On Ex Via Lake all the larvae were dead in seven out of nine pans, whereas, in the other two pans, 5 larvae remained alive in one and 2 in the other. The first of these was in a pocket along the shore, and this was the only part of the area where any considerable number of larvae were found remaining after the treatment. A few small larvae were found at several of the. Fig. 8.—One of the pans containing larvae and floating on the surface of the water as used in the lake-dusting experiments in 1924. The view also shows the water conditions encountered during these tests other stations and the total reduction for the whole area was 88 per cent. At the second lake the treatment was highly successful, as all of the larvae in the 11 pans were killed and none were to be found in the lake water in any part of the area except at one place where a small quantity of dust had fallen and where a few of the very smallest larvae had escaped. The number found remaining was less than 1 per cent of the total counted in the examinations made previous to dusting. SUMMARY Dusting Paris green from airplanes to control the breeding of Anopheles mosquitoes was tried in 1923 and 1924 on the extensive swamp and marsh areas in the vicinity of Mound, La. Army model DeHaviland planes were employed and were operated by United. 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 perfectly resemble the original work.
Size: 1817px × 1375px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashingtondcusdept
