. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. FUMIGATION OF CITRUS TREES. 31 The inaccuracy of such a method is at once apparent. Measure- ments made after many estimators have shown that the most careful are very irregular in their scheduling. No one has been found who does not at times vary as much as 50 per cent in dosage estimates for trees containing exactly the same cubic contents after being covered with This variation in the scheduling of an indi- vidual fumigator is not all, but the general average dosage used by one man has frequently been
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. FUMIGATION OF CITRUS TREES. 31 The inaccuracy of such a method is at once apparent. Measure- ments made after many estimators have shown that the most careful are very irregular in their scheduling. No one has been found who does not at times vary as much as 50 per cent in dosage estimates for trees containing exactly the same cubic contents after being covered with This variation in the scheduling of an indi- vidual fumigator is not all, but the general average dosage used by one man has frequently been one-fourth to one- half more and sometimes even twice that used by another for the very same insect. This chart of dos- age for the trees in an orchard is taken into the held at night. Before dos- ing a row of trees the common meth- od is to first meas- ure out the dosages for the trees in this row into small cans and pitchers, which are placed in a hand tray, as shown in figure 8. This tray is then carried from one tree to the next down the row. The water is carried in a pail and measured at each tree. The instruments used for measuring the water have been found to vary all the way from graduated dippers to quart pitchers or old tin cans. Under this old method the general results secured bv a few of the more careful and expert fumigators have been fairly good. However, the work in the majority of cases has been irregular and poor. This old system is rapidly sinking into disuse, being replaced by an improved procedure which has resulted from the present Fig. 8. -Man earning tray and water bucket as practiced under old system of fumigation. (Author's illustration.) i See Bui. 79, Rur. Ent., U. S. Dept. Agr., pp. 23-24, 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 United States. Burea
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