324 AGRICULTURE. 



terminal segment of the abdomen of the plant-louse ? 

 Is there a drop of honeydew on the tops of these tubes ? 

 What do you find ants doing with this honeydew ? If 

 no honeydew is present, observe the ants stroke these 

 plant-lice with their antennae. Do they then obtain the 

 honeydew (Fig. 115) ? This process is commonly spoken 

 of as the "ants milking their cows." Bees and wasps 

 also like this honeydew. 



Ants care for the plant-lice in many ways, protecting 

 their eggs and carrying the lice to the roots, upon which 

 they feed. 



(b) Do you find any enemies in the colony? 



(c) Kerosene emulsion is, perhaps, the best remedy. 

 Why? 



(</) Will the Paris green spray kill them ? Explain. 



2. The Rose-slug (Monostegia roses] is a soft- 

 bodied larva, green above and yellowish below, 

 which eats the surface of the rose leaves, leaving 

 only the framework. When full grown the 

 larva buries in the ground. The adult is a tiny 

 black fly with dull-colored wings, and with the 

 first and second pair of legs grayish. There are 

 two broods a year (one in early summer and one 

 in late summer), the second brood pupating in 

 the ground over winter, and the adult emerg- 

 ing in the spring. Either Paris green or kero- 

 sene emulsion will form an effective remedy. 

 Why? 



3. Tent-caterpillar. There are several 

 species of tent-caterpillars ; but only two, the 

 apple tent-caterpillar (Clisiocampa aincricana], 

 and the forest tent-caterpillar {Clisiocampa 



