Worm — which are probably present in some parts of the state, 

 but which have not yet become so injurious as they have in 

 neighboring states. The purpose of these pages is to warn the 

 fruit-growers of the state of the threatened danger, and to give 

 them the information necessary for recognizing and combating 

 the pests when they do appear. For the facts I am especially 

 indebted to the publications of the Department of Agriculture, 

 the State Entomologist of New York, and the experiment sta- 

 tions of New Jersey and the Cornell University. The illustra- 

 tions have come from the same sources, and should be specifi- 

 cally credited as follows : After Slingerland, Figs. 3-8 ; after 

 Howard, Figs. 10-14; after Taschenburg, Figs. 15-18; after 

 Lintner, Fig. i ; after Riley, Fig. 2. 



Fig. I. Pear Midge Injury: a, uninjured young pear; />, infested pear cut 

 open to show midge larvae ; tr, d, e, f, outlines of infested fruits. 



The Pear Midge 



Diplosis pyrivora 



This insect appears to have been introduced into America 

 about 1877, being first noticed in Connecticut. It has 

 since spread into a number of neighboring states, and has 

 become in many localities the most destructive enemy of the 

 pear. The adult is a small mosquito-like grayish fly (Fig. 2, c) 

 having a slender body, long legs, and a long ovipositor project- 



