. Economic entomology for the 190 AA^ ECONOMIC ENTOMOLOGY. applied with a knapsack pump through a Vermorel nozzle, and a little Paris green adds greatly to its effectiveness. It should be renewed every week or two until the middle of July, when the danger from these flat-headed borers may be considered at an end, and it has the advantage of protecting the branches as well as the trunk. The admixture of a little glue or salt wiU improve its adhesive and lasting qualities. A strong fish-oil soap, say one pound in one gallon of water, is also effective and may be applied in the same man
. Economic entomology for the 190 AA^ ECONOMIC ENTOMOLOGY. applied with a knapsack pump through a Vermorel nozzle, and a little Paris green adds greatly to its effectiveness. It should be renewed every week or two until the middle of July, when the danger from these flat-headed borers may be considered at an end, and it has the advantage of protecting the branches as well as the trunk. The admixture of a little glue or salt wiU improve its adhesive and lasting qualities. A strong fish-oil soap, say one pound in one gallon of water, is also effective and may be applied in the same manner. It forms a film of soap over the bark, and is repellent to the beetles as well as fatal to the young larvae. The admixture of an ounce of crude carbolic acid to a gallon of suds is advantageous. This mixture should not be applied to leaves or on young shoots, as it would probably cause injury. As these methods are all preventive rather than remedial, they must be promptly and thoroughly applied, and success will be in proportion to the thoroughness with which the work is done. Instead of any of the preceding methods, "insect lime" or "dendrolene" may be with proper precautions employed on the trunks and larger branches, and, practically, this is the best material for use against the "sinuate ; It can be easily applied, remains effective for weeks, and one application, properly made at the right time, will protect the trees for the season. As against the pear-borer, it should be applied not later than May 15th, and are no species injurious to vegetation, though, under the name "fire-flies," some of them are well known. The beetles are usually slender, somewhat flattened above, with a more or less retracted head, and are of a soft leathery texture. The '' fire-. FiG. 175. kept intact until June 15th, when all danger from that pest is over. Reference should be made to the chapters on insecticides and preventives for further d
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