Results obtained with Polychlorides and Paradichlorobenzene against the Larvae of Polyphylla fullo, L., and Melolontha hippocastani, F.

Extract

The following is a summary of some experiments that were carried out in 1930, 1931 and 1932 on the sandy soils of Darnitza Forest Reserve (near Kiev) and Kruilov Forest Reserve (near Kremenchug), 112 plots, each covering an area of 100 square sazhen (70ft. by 70ft), having been used for the tests. The polychlorides were of two kinds: dark polychlorides, which had a less homogeneous structure and contained a smaller quantity of dichlorides, the amount of higher polychlorides being greater; and light-coloured polychlorides, which chiefly contained dichlorobenzenes and only relatively small quantities of chlorobenzene and higher polychlorides. In the experiments during 1931 and 1932 certain quantities of the chemical were applied to a given area, namely: 26,047 gm., 15,935 gm. and 13,026 gm. to an experimental plot of the size mentioned above. The chemicals were introduced into the soil at intervals of 28, 21 or 14 inches, the lines of the holes being also 28, 21 or 14 inches apart respectively.