 ... efficiency of the duck as a destroyer of mosquito life until the foregoing test was made. In the work of Howard, Dyar, and Knab, entitled "Mosquitoes of North and Central America and the West Indies," will be found* an essay on the destruction of...  Report - Seite 121von Pennsylvania. Department of Health - 1916Vollansicht - Über dieses Buch
 | 1912 - 572 Seiten
...birds must destroy many larvae and eggs. Mr. Wm. Beutenmuller, in the essay previously cited, is of opinion that aquatic birds could be used for the purpose of destroying mosquito larvae, in rain-pools, ponds, and other waters near houses; also in ponds in well-cleared fields and cultivated... | |
 | Leland Ossian Howard - 1912 - 584 Seiten
...birds must destroy many larvae and eggs. Mr. Wm. Beutenmuller, in the essay previously cited, is of opinion that aquatic birds could be used for the purpose of destroying mosquito larvae, in rain-pools, ponds, and other waters near houses ; also in ponds in well-cleared fields and cultivated... | |
 | 1916 - 918 Seiten
...will be found* an essay on the destruction of the mosquito and house fly by Mr. William Beutenmueller, who expresses the opinion that aquatic birds could...Survey found mosquitoes in the gizzard of the mallard duck. While other birds, fish, spiders, batrachians, arthropods, and reptiles are all enemies of the... | |
 | 1914 - 870 Seiten
...like fish, keep pools and ponds free from mosquito larvae. Howard, Dyar, and Knab3 cite Beutenmuller's opinion that aquatic birds could be used for the purpose of destroying mosquito larvae in rain barrels, ponds, and other waters near houses ; also in well-cleared fields and cultivated land... | |
 | 1914 - 844 Seiten
...like fish, keep pools and ponds free from mosquito larvae. Howard, Dyar, and Knab3 cite Beutenmuller's opinion that aquatic birds could be used for the purpose of destroying mosquito larva? in rain barrels, ponds, and other waters near houses ; also in well-cleared fields and cultivated... | |
 | 1914 - 712 Seiten
...will be found an essay on the destruction of the mosquito and housefly, by Mr. William Beutenmueller, who expresses the opinion that aquatic birds could...Survey, found mosquitoes in the gizzard of the mallard duck. While other birds, fish, spiders, batrachians, arthropods and reptiles are all enemies of the... | |
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