MECHANICAL MEASURES AGAINST INSECTS 49 



In using a liquid spray, apply until the liquid drips from the 

 tree. Never spray a tree in bloom, because of danger to visiting 

 bees. 



MECHANICAL MEASURES AGAINST INSECTS 



1. Trap Crops. A crop not desired by the farmer may be 

 used to attract insect pests which might otherwise attack a valuable 

 crop. For example, millet planted about a corn field will protect 

 the latter crop from chinch bugs, which prefer the millet and may 

 be destroyed thereon. 



2. Lantern Traps. A lighted lantern suspended at night over 

 a tub partially filled with water covered with a film of kerosene 

 will attract large numbers of May beetles or "June bugs" (Fig. 



i 





FIG. 69. A lantern trap for catching June beetles. 



69). This remedy should be used at the very first appearance of 

 the insects, before the females have laid their eggs. 



3. Bands of burlap or other material about apple trees afford 

 a nesting place for larvae of codling moths. The larvae or pupae 

 under the bands may be destroyed at intervals. 



Traps for encircling trunks of trees, preventing the ascent of 

 canker worms, are on the market. 



4. Tree Tanglefoot. This is a manufactured sticky compound 

 used as a band on trunks of trees to prevent ascent of wingless 

 moths and caterpillars; when used on young and tender-barked 

 trees, these must be protected by paper or cloth so that the tangle- 

 foot will not come in direct contact with the tender bark. This 

 paper or cloth should not be tied on young trees with a tight string 

 and left during the growing season for fear of girdling the tree. 



4 



