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The Pamphlet Collection of Sir Robert Stout: Volume 62

Paris Green and London Purple

Paris Green and London Purple.

These arsenites are the best remedy against the codlin-moth, and, indeed, all leaf-eating insects, such as the pear-and plum-tree slug or leech, grasshoppers, various caterpillars, and bronze and other leaf-and fruit-eating beetles. Proportions as follows:—
Paris green or London purple 1lb.
Fresh quicklime 6lb. or 8lb.
Water 150gals.
page 10

Slack the lime in two or three gallons of water, strain into the spraying apparatus. The Paris green or London purple should first be mixed with a small quantity of water, making a batter, then thin down and mix thoroughly with the lime-water, making the mixture up to the proportions as above. Care must be taken while spraying to keep the mixture thoroughly well stirred up, as the Paris green very soon settles down to the bottom.

In spraying apples for the codlin-moth, at least two or three applications are necessary; indeed, if surrounded by careless neighbours who do nothing to their trees, it will be necessary to spray from five to seven times. The first spraying should be made as soon as the blossom has fallen, the following sprayings generally at intervals of a fortnight. Any precise rule for this cannot be stated; the orchardist must exercise his own judgment. If the weather is calm and fine longer intervals between the sprayings should rule, and, on the contrary, if wet and boisterous the poison is soon washed or blown off, and must be applied at shorter intervals; indeed, if heavy rain should come on within twenty-four hours of spraying the spray should be applied again at the earliest moment.

In the case of bronze-beetle, and other leaf-and fruit-eating insects, spray at the earliest indication of their presence. It might also be noted that Paris green has been found to be an efficient preventative of scab on apples.