INSECTS AFFECTING OHIO SHADE TREES 195 



Spraying- with arsenate of lead, used at the rate of 5 pounds to 

 50 gallons of Water, as soon as the young leaves are well developed 

 is the most satisfactory remedy for combatting- this pest. If the 

 application be made at that time, many of the adult beetles will be 

 destroyed and egg-laying prevented. 



The banding process undoubtedly does considerable good, but 

 the labor involved in watching the bands renders the cost out of 

 proportion to the good accomplished. See Plate 15, Fig. 2. 



_ . ,,. This insect has occurred in destructive 



The Locust Leaf Miner, f . .~ , . 



Odontotaaorsalh Thumb, numbers for several years m Ohio, the 



.most severe attacks being upon yellow 



locust, both in plantings and in the wild hillside growth along the 

 southern border of the state. It may be found in the vicinity of 

 Wooster, but very scatteringly. Along the section bordering the 

 Ohio River, the locusts suffer so severely as to cause the browning and 

 shedding of the leaves, large areas appearing as if scorched by fire. 



The adult is a flattened beetle about Y\ inch in length. The 

 general color is red, broken by a medial line, with head, appendages 

 and under surface black. The wings are deeply dotted with fine 

 punctures. 



The winter is passed in the adult stage under trash in the vicinity 

 of the feeding ground. In the spring the beetles emerge soon after 

 the leaves of the locust are well grown. Eggs are deposited upon 

 the surface of the leaves, and the young larva makes its way out 

 through the under side of the egg-shell into the tissue of the leaf, 

 feeding until grown and pupating between the two layers of epider- 

 mis. The adults feed upon the leaves and may be found in the groves 

 throughput the summer. The most satisfactory method of combat- 

 ting the pest is spraying thoroughly with arsenicals as soon as the 

 locust leaves are out, that the beetles may be killed before egg laying 

 is accomplished. This of course is impracticable for forest plantings. 



^j T , ,-, So destructive is the work of this insect 



The Locust Borer, . , , . 



Cyllene robtniae Drury. u P on locust trees that m some P laces the 



growing of a perfect tree is an im- 

 possibility. The adult belongs to that class of insects known as the 

 long-horned borers. It is a black beetle, brilliantly marked with yellow 

 lines; the long antennae and the legs are dull yellow and the length 

 varies from 1% to 1^4 inches. 



At the time the golden rod blossoms the adults appear .and egg- 

 laying commences. The female hurries about over the trunk of the 

 tree, and when a crevice is found which suits her fancy she deposits a 

 single white egg, then continues her search for another place. The 

 eggs are shown much magnified in Plate 17, Fig. 1. 



