. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Improper Ways of Applying Paradichlorobenzene. 1. The crystal ring is too close to the tree trunk. It should be at least 1 inch away. 2. The crystal ring is too far from the tree trunk for good results. 3. The soil level should have been raised around this tree before applying the crystals, as there are borers at work above the present soil level. No borers will be kiiled above the crystal ring, as the gas is heavier than Please note that these images are extracted from scanned page images that may have been digi
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Improper Ways of Applying Paradichlorobenzene. 1. The crystal ring is too close to the tree trunk. It should be at least 1 inch away. 2. The crystal ring is too far from the tree trunk for good results. 3. The soil level should have been raised around this tree before applying the crystals, as there are borers at work above the present soil level. No borers will be kiiled above the crystal ring, as the gas is heavier than 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. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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