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remove all that appear in devastatiug numbers as far as it is possible to 

 do so. 



The European leopard moth [Zeuzera pyrina) is one of the worst 

 insects we have to contend with. It works in secret, and not until the 

 damage is done can we locate it. Last season we spent two months on 

 this insect alone, collecting and destroying the larvte and pupa'. All 

 the affected limbs were collected, the insects removed, and then the 

 limbs were taken to the dump and destroyed by fire, in this way mak- 

 ing the work complete. A great many wagon -loads were so collected 

 and destroyed, and this work manifested itself this year in the lesser 

 number of trees affected. This year we continued the work of collect- 

 ing, but were only able to give two weeks to it, but with the aid of the 

 gardeners we were able to destroy a great many. I believe the work 

 we have done with this insect alone has saved thousands of trees in our 

 parks that would otherwise have been either destroyed or deformed. 

 This question is a serious one when we are considering such valuable 

 representations of our Silva as are collected in our city parks, for when 

 a limb is amputated by this insect the stub is most sure to die, and if 

 the fungus does not immediately take possession of it, it will be ampu- 

 tated by a so-called gardener, who does not see the advisability of pro- 

 tecting the scar from fungi and insects; and here is ofiered a field for 

 the greedy fungi, whose ever-present spores are ready to grow when 

 the i^roper field offers itself, and they hardly ever fail to take posses- 

 sion and all over our tine elms can be seen with groups of Agaricus 

 ulmarius in all stages of growth. This close pruning, without proper 

 protection from insects and fungi, is one of the most important ques- 

 tions of our times, for every year great numbers of trees are destroyed 

 for want of proper protection and a knowledge of seasonable pruning. 

 Right here the sap-fly, which I take to be Mycetohia pallipes* finds 

 congenial habitat, and hundreds of trees are weakened by the flow of 

 sap they cause, besides being unsightly from the slimy frass running 

 down their sides. Those we treat with a crude carbolic-acid emulsion 

 sprayed over them; after a time, however, they again show themselves, 

 and have to be treated again. 



The elm leaf-beetle is another pest that we have to fight, but with 

 the force of two men, and miles of ground to cover, it is very difficult 

 to keep this insect in subjection. Our success has been in preventive 

 measures rather than otherwise. However, we do successfully destroy 

 them when they have spread over the entire tree. As soon as the first 

 eggs are discovered on the leaves, about the 1st of June, we immedi- 

 ately poison the foliage and keep them from spreading. When the 

 larv?e come down to pupate and collect at the base of the tree, we treat 

 them by spraying with an emulsion of kerosene and crude carbolic acid. 

 In this way we destroy bushels of them, and with the spraying are 

 able to keep them in check in our city parks. 



*Mr. A. D. Hopkins says it is probably a species of Sciara. -E. B. S. 



