814 OHIO EXPERIMENT STATION: BULLETIN 332 



much more widely distributed than the foregoing records would 

 indicate. 



Natural enemies. — We have repeatedly bred a chalcid, Zatropis 

 catalpae, from material collected at Wooster, and a lace-wing larva 

 Chrysopa sp., has been observed feeding upon the larvae. 



Control. — Unfortunately . for the catalpa industry, no satis- 

 factory control measure is known for this species. It has been 

 observed, however, that cultivated groves are less seriously attacked 

 than uncultivated ones, hence it is advisable that cultivation be 

 practiced until the trees are well started. 



THE SYCAMORE LACE BUG 



{Corythuca ciliata Say) 



Description. — The sycamore lace bug is not a well-known shade 

 tree pest in Ohio, regardless of the fact that it is well distributed 

 and does considerable harm each season. In fact, it has up until 

 recently received but scant attention from entomologists. Its life 

 history as well as other items pertaining to its economy have been 

 worked out and published during the past year. See Bulletin 116, 

 Oklahoma Agricultural Experiment Station, by Otis Waid. 



The sycamore lace bug belongs to the family of insects called 

 the Tingitidae, members of which take their food in the form of sap. 

 The adults are a little over one-sixteenth of an inch in length and 

 are about half as wide as long. They are much flattened, and the 

 wings as well as the thorax are beautifully sculptured to resemble 

 an intricate, lacy network. It is because of this fact that the insect 

 merits its common name. (See Plate LXI, Fig. 1.) 



The younger or nymphal stages closely resemble the adult in 

 general conformation, but lack the characteristic lacy appearance. 

 They are generously ornamented with spines on the sides and back. 

 (See Plate LXI, Fig.3.) 



Life history and habits. — The winter is passed by the adult 

 insects under the shelter of the bark scales and on the trunk of the 

 nost and in other similarly protected positions. With the appear- 

 ance of the sycamore foliage in the spring, the adults emerge and 

 oviposit on the underside of the leaves. Within a lew days, the 

 exact time depending upon the temperature at that season, the eggs 

 hatch and the series of seasonal generations is started. Waid found 

 under greenhouse conditions which approximated late spring 

 weather, that a little over a month was required for the insect to 

 pass from the egg and through the five nymphal instars to the adult 

 stage. It is possible therefore for several generations to develop 

 during a smgle summer, particularly since the period of the lite 



