450 OHIO EXPERIMENT STATION: BULLETIN 332 



PLATE LX 



THE CATALPA MIDGE 

 (Itonida catalpae) 



Fig. 1. In instances of severe attack by the midge, the myriads of feeding 

 larvae are found clustered along the midribs and veins of the leaves, causing 

 a complete breaking down or wilting. The wilted leaves are seen in this 

 illustration. 



Fig. 2. After the leaves are wilted they turn brown and become greatly 

 distorted. 



Fig. 3. The leaves of the terminal shoot are attacked first and when the 

 injury is sufficiently severe to kill the leaves, the growing shoot also is affected 

 frequently being killed outright as shown in this figure. 



Fig. 4. The successive killing back of the terminal and other principal 

 shoots ultimately results in a bushy, stunted growth, destroying the value of 

 the catalpa for post and pole timber. 



