484 SCIENCE OF HOME AND COMMUNITY 



ing insects, a poison, such as kerosene emulsion, is sprayed 

 directly on the insect, killing it by contact or by clogging its 

 breathing tubes. The boring insects are very difficult to 

 control, but if not present in large numbers, they may be cut 

 out by a knife or killed by means of a wire. Sometimes 

 insects may be prevented from reaching the foliage by wrap- 

 ping bands of sticky material around the trunk of the tree. 



FIELD EXERCISE n 



Purpose. To learn what shade trees are growing in your 

 town and if they are properly cared for. 



Directions, i . One purpose of the field trip may be to identify 

 the shade trees growing in the town. For this purpose the 

 following points may be observed regarding each tree : 



A . Character of bark as to color and roughness. 



B. Method of branching. 



C. Leaves. 



a. Kind simple or compound. 



b. Arrangement alternate or opposite. 



c. Margin entire, toothed, or lobed. 



d. Drawing of leaf. 



D. Flowers. 



E. Fruit. 



F. Chief characters by which identified. 



2. Observe the trees to see if they are being properly cared 

 for. Have the limbs been cut off correctly in pruning? Are 

 there any wounds that need care to keep out spores of disease- 

 forming plants? Are there any broken branches that need 

 pruning? Are any fungi found growing on the trees? Are 

 insects doing any serious damage? Are trees being injured 

 because horses are hitched to them ? 



3. If there is opportunity for planting trees around the school 

 grounds, the class may plan to plant some on Arbor Day. 



