SLUGS EATING THE LEAF SURFACE 



289 



Fig. 42^ 



Work and larva of the Pear-slug. Original. 



and if the slugs are numerous, the entire foUage of the tree may look 

 scorched and drop off. When nearly full grown, the larvse lose their 

 slimy coating with the last 

 molt, and are then a clear yel- 

 low in color. 



There are two or three gen- 

 erations in a season. The 

 slugs are apt to be more nu- 

 merous in the middle or latter 

 part of summer. The adult is 

 a sawfly. Eggs are laid within 

 the tissues of tlie leaf. 



Ordinarily the simplest means 

 of control is to apply Paris green or arsenate of lead to the foliage. 

 The slugs are easily killed. 



The Peach and Plum Slug {Caliroa amygdalina Rohwer) 



The work of this insect is similar to that of the common pear-slug. 

 The species is found in the Gulf states. There are half a dozen or more 

 generations each season, and injury is most severe toward the end of 

 summer. Spraying with an arsenical poison is the readiest remedy. 



Fig. 426. — Adult of the Pear-slug. En- 

 larged and natural size. Original. 



