EXPERIMENTS AND PRACTICAL WORK 



69 



INSECT PESTS 



(See Tropical Readers, Book II, pp. 103-106.) 



Expt. 138. Collection of Damaged Specimens. 

 (a) Collect roots of two different kinds of plants 



attacked by insect pests, e.g. root of rose by macacca 



worm, root of cocoa by fiddler beetle. 



(h) Collect damaged leaves of three different kinds of 



plants attacked by caterpillars, e.g. cabbage, tobacco, 



sweet potato. 



(c) Collect injured 

 stems of two kinds of 

 plants attacked by in- 

 sect borers, e.g. sugar 

 cane, wild cassada. 



(d) Collect a sam- 

 ple of seeds attacked 

 by small beetles, e.g. 

 corn, peas, tamarind. 



Expt. 139. Draw- 

 ing of Insect Pests. 

 Make drawings of 

 three destructive in- 

 sects, recording what 

 they damage; colour 

 with crayon. 



Expt. HO. Scale 

 Insects. Collect 

 four different kinds 

 of scale insects, exam- 

 ining such plants as 



oleanders, oranges, hibiscuses. 

 Expt. 141. How the Caterpillar changes its Form. 



In a breeding cage (fig. 29), made as shown in the 



Fig. 29. 



-Breeding Cage for Caterpillars 



