66 



MASS. EXPERIMENT STATION BULLETIN 353 



Later they eat everything except the larger veins. They feed gregariously at 

 first but later separate. They may also feed on the bark on the shoots. Maturity 

 is reached in about 2 weeks, when the grubs attach themselves to a leaf by means 

 of a sticky disk at the tip of the abdomen and pupate. They usually transform to 

 adults in about 2 weeks. The beetles then feed on the tender leaves and bark at 

 the tips of the willow shoots. In central New York State there are probably two 

 broods and possibly three in some years. 



Control. A poison spray of 4 pounds of lead arsenate to 100 gallons of water, 

 applied when the larvae first appear, is recommended for the control of this 

 insect. The under side of the leaves should be thoroughly covered. The addition 

 of 2 pounds of flour or 1 pound of calcium caseinate should improve the adhesive- 

 ness of the spray. A second application about 2 weeks later may be necessary in 

 a severe infestation. 



Felt, E. P. N. Y. State Mus. Mem. 8(1) :317-322. 1905. 



Felt, E. P. N. Y. State Mus. Mem. 8(2) :564-565. 1906. 



Lowe, U. H. N. Y. Agr. Exp. Sta. Bui. 143. 1898. 



Packard, A. S. Fifth Rpt. U. S. Ent. Comm., pp. 428-433. 1890. 



Locust Leaf Miner 



CJiLilepiiS dor sails Tlumb. 



This insect is known to occur in North America from Virginia north into 

 Canada and west and south to Missouri. The foliage of black locust is attacked 

 by the grubs and adult beetles, and serious injury has often been done to this 

 tree. The beetles skeletonize the under surface of the leaves; and the grubs, or 

 larvae, form large, blisterlike mines, also on the under side. The injured foliage 

 turns brown, withers, and falls to the ground. Large areas of black locust may be 

 defoliated. Although black locust is preferred, apple, elrn, oak, beech, dogwood, 

 wild cherry, and hawthorn as well as red clover, hog peanut, raspberry, and soy- 

 beans have occasionally been attacked, mainly by the beetles. 



Locust Leaf Miner, Chalepus dorsalis 



1. Adult beetle. Greatly enlarged. 



2. Leaf injured by adult beetles. Courtesy, N. Y. State Museum, Albany, N. Y. 



Description. The beetle is about M inch long, flat, and orange-red in color, 

 with head, legs, and antennae black. The inner edge of each wing cover is also 

 black, forming a broad, black, median dorsal stripe. The wing covers are deeply 

 punctured and each bears four longitudinal ridges. 



