Zobrazeno 1 - 10 of 23 pro vyhledávání: '"Donald E. H. Frear"'
1
Mechanism of the Insecticidal Action of Mercury and Mercury Salts1
Autor: Donald E. H. Frear, L. E. Dills
Publikováno v: Journal of Economic Entomology. 60:570-574
The ovicidal action of mercury salts applied to the soil is due to metallic mercury in the gaseous state. The presence of mercury in the atmosphere over mixtures of soil and mercury salts has been repeatedly demonstrated. The concentration of mercury
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0d6a0906457bd9593c845463cec3683e
https://doi.org/10.1093/jee/60.4.570
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2
PHOTOELECTRIC APPARATUS FOR MEASURING LEAF AREAS
Autor: Donald E. H. Frear
Publikováno v: Plant Physiology. 10:569-574
The need to measure accurately the area of several thousand apple leaves in connection with a study of the deposit of spray residues led to a search of existing methods of leaf area measurement. The several methods described in the literature failed
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::193e5a0a08a4fec01b142b8632d71fef
https://doi.org/10.1104/pp.10.3.569
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3
The Use of Treatments Containing Methoxychlor Against Biting Flies on Cattle and the Determination of Methoxychlor Residues in Milk1
Autor: Henry F. Enos, Tien-Hsi Cheng, Donald E. H. Frear
Publikováno v: Journal of Economic Entomology. 51:618-623
Experiments on the use of treatments containing methoxychlor against biting flies on cattle and the determination of methoxychlor residues in milk were conducted in Centre and Northumberland Counties, Pennsylvania, during the summer of 1957. Treatmen
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3364aa8822058b676cd620150b1dc628
https://doi.org/10.1093/jee/51.5.618
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4
Use of Daphnia magna for the Microbioassay of Pesticides. I. Development of Standardized Techniques for Rearing Daphnia and Preparation of Dosage-Mortality Curves for Pesticides1
Autor: John E. Boyd, Donald E. H. Frear
Publikováno v: Journal of Economic Entomology. 60:1228-1236
Detailed study of optimal conditions of rearing and testing Daphnia magna Straus showed that it was possible to rear this organism under closely controlled laboratory conditions. Under these conditions asexual reproduction yielded a homogeneous popul
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e962734459fc54a4261d33ea8f5523cc
https://doi.org/10.1093/jee/60.5.1228
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6
The Use of Spray and Aerosol Formulations Containing R-1207 and Dimethoate for Fly Control on Cattle and the Determination of Dimethoate Residues in Milk1
Autor: Henry F. Enos, Donald E. H. Frear, Tien-Hsi Cheng
Publikováno v: Journal of Economic Entomology. 55:39-43
The effective of R-1207 (3-chloropropyl n -octyl sulfoxide) and dimethoate for the control of flies on cattle in 1928 and 1959 was tested by means of applications with an electric-eye-controlled sprayer and a photoelectric aerosol applicator. On the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bc31fb9bb0b0303c5aac10536d65ddea
https://doi.org/10.1093/jee/55.1.39
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8
A STUDY OF THE EFFECT OF H-ION CONCENTRATION ON THE GROWTH OF AGARICUS CAMPESTRIS
Autor: D. E. Haley, Donald E. H. Frear, J. F. Styer
Publikováno v: Plant Physiology. 3:91-94
It has long been known that Agaricus campestris, the common mushroom, grows well on horse manure which has been partially decomposed. In order for fruition to occur, however, the manure must be covered with a thin layer of soil shortly after a good m
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2040c5206cee796cb79840a5aa8ea64c
https://doi.org/10.1104/pp.3.1.91
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10
Effectiveness of Aerosol Formulations Containing Methoxychlor and Other Insecticide-Repellents against Biting Flies on Cattle, and Analyses of Milk from Treated Animals1
Autor: Tien-Hsi Cheng, Henry F. Enos, Donald E. H. Frear
Publikováno v: Journal of Economic Entomology. 52:866-868
Aerosol containers charged with 1, 2, and 4% of methoxyehlor in various combinations with N,N-diethyl- m -toluamide, Thanite® (isobornyl thiocyanoacetate-82%), MGK R-326 (di- m -propyl isocinchomeronate), pyrethrins, and other ingredients were relea
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0f34842cf312095482763fed556189d5
https://doi.org/10.1093/jee/52.5.866
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