. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. NAPHTHALENE AS A GREENHOUSE FUMIGANT 11 Although experiments under ideal conditions in a special fumigation chamber indicate that an exposure of 3 to 5 hours is frequently effective, actual practice shows that the efficiency of naphthalene fumigations is usually less under average greenhouse conditions and an exposure of 6 hours is necessary. Figure 1 — Mortality of Common Red Spider When Naphthalene is Vaporized at a Heavy Uniform Rate during the First Half of the Exposure, and at a Light Uniform Rate, o
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. NAPHTHALENE AS A GREENHOUSE FUMIGANT 11 Although experiments under ideal conditions in a special fumigation chamber indicate that an exposure of 3 to 5 hours is frequently effective, actual practice shows that the efficiency of naphthalene fumigations is usually less under average greenhouse conditions and an exposure of 6 hours is necessary. Figure 1 — Mortality of Common Red Spider When Naphthalene is Vaporized at a Heavy Uniform Rate during the First Half of the Exposure, and at a Light Uniform Rate, or Omitted, During the Last Half of the Exposure as Compared With a Uniform Vapor- ization During the Whole Fumigation. Dosage 2 Ounces per 1,000 Cubic Feet. Exposure 6 Hours. Temperature 75° F. Relative Humidity 75 Percent. Waltham, Massachusetts. 4 5 EXPOSURE IN HOURS A — 1 ounce each hour for 3 hours — none for 3 hours B — % ounce each hour for 3 hours — J| ounce each hour for 3 hours C — lA ounce each hour for 6 hours D — Commercially effective mortality from 1 fumigation. 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 Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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