8 INSECTS OF ECONOMIC IMPORTANCE 



a. Sucking" insects 



These are represented by the aphids, bugs, and 

 flies. The niouthparts are formed for piercing the 

 plant and sucking out the juices. 



b. Biting insects 



These may be represented by the grasshoppers 

 and l3eetles. The niouthparts are formed for biting 

 ofl^ bits of the plants and chewing them. 



METHODS OF CONTROL OF INSECT PESTS 



Ideas and practices of ancient times and peoples. 

 Modern ideas and practices are based on two 

 main methods : natural and artificial. 



Natural methods 



Hand-picking — tomato worms, tobacco worms, 

 squash bugs. 



Cutting out by hand — peach-tree borer, apple-tree 

 borers. 



Covering plants to protect them — cucumber 

 beetles. 



Hopper-dozers — for grasshoppers and leafhop- 

 pers. 



Burlap and cotton bands — for canker-worms and 

 codling moth. 



Sticky bands — for canker-worms and gypsy 

 moth. 



Sticky shields — for leafhoppers. 



Barrier method — for chinch bug and army 

 worms. 



Collecting eggs — gypsy moth and tent caterpil- 

 lars. 



Collecting larv?e — brown-tail moth. 



Burning branches and trees — for shot-hole borer, 

 bronze birch borer, twig girdler, raspberry cane- 

 girdler, et al. 



