REVISED COMPATIBILITY CHART OF INSECTICIDES AND FUNGICIDES.

New Zealand Journal of Agriculture, Volume XVIII, Issue 1, 20 January 1919, Page 39

REVISED COMPATIBILITY CHART OF INSECTICIDES AND FUNGICIDES.

In the Journal for March, 1916 (p. 194), was published, under the heading of “ A Chemical Guide Chart for Fruitgrowers,” a diagram showing the effect of mixing various spraying-compounds. The chart was

KEY TO CHART.

Dangerous combinations i.— Data lacking:— Recommended combinations :—- Probably dangerous — — — —— Doubtful combinations, useful Probably safe . under some conditions Doubtful ••

based upon a compatibility table by Mr. G. P. Gray, of California, and investigations by Mr. W. C. Morris, Agricultural Instructor to the Hawke's Bay Board of Education. A revised chart by Mr. Gray was recently published by the University of California College o: Agriculture,

and is here reproduced* for the further information of orchardists and others. It will be seen that the stomach poisons are arranged about the upper left segment of- the circle, the fungicides about the upper right segment, and the tracheal poisons (contact insecticides, gaseous, liquid, and solid) about the lower segment. Lime-sulphur solution, sulphur, and the alkali sulphides have important uses both as insecticides and fungicides, consequently (explains Mr. Gray) the segments upon which they are' arranged are made to overlap, in. order to indicate their double utility, and to avoid duplication and an unnecessary number of lines. The materials named have been confined' to the standard remedies in use in orchard and spray practice. . . ,

* In the original the various lines are distinguished by different colours. Lineal variations are here substituted for such colours. . .