312 Kei'ort of the Entomologists of THM 



Collecting the cocoons. — !Manj of the cocoons are spun in places 

 where they can be easily reached. In collecting and destroying 

 them many useful parasites would be destroyed but in case of a 

 serious outbreak the thorough collecting of the cocoons would 

 accomplish more immediate good than the parasites. It would, 

 however, be but little trouble to place the cocoons under a coarse 

 netting and leave them until the parasites had escaped. The 

 netting should be too fine to allow the moths to pass but coarse 

 enough to allow the parasites to escape. 



Capturing the moths. — As previously stated the moths fly at 

 dusk or later. They are attracted by a bright light, and may be 

 captured by placing a lighted lantern over a tub of water, over 

 which enough kerosene oil has been poured to make a thin film. 

 The moths flying about the light will fall into the water. While 

 this method may be of some value it is doubtful if many female 

 luoths will fly to the light before having deposited their eggs, 

 after which of course, it makes no difference whether they are 

 attracted to the light or not. 



Combating the insect when attacking shade trees. — All of the 

 methods just described can be used to check the insect when 

 attacking small shade trees. For large trees banding is of much 

 value. In some of the villages in which the caterpillars were 

 abundant last spring, they were dislodged from the large trees by 

 streams of hydrant water and prevented from going back up the 

 trunks by the sticky bands. For spraying the large trees special 

 apparatus is required. Steam power is usually used. A suitable 

 outfit can be purchased for from about $200 up. The increase of 

 shade tree insect pests and diseases make it almost necessary for 

 a village to own a spraying apparatus to ensure the preservation of 

 its shade trees. 



A method of combating the insects which has been tried with 

 success is to encourage the school children to collect the egg masses 

 by paying them a reasonable price per hundred. This may be 

 done by the private individual or by the village or city authori- 



