134 OAK APPLE 



find a gall on the upper side of a leaf ? On what kind of oak 

 have you seen the greatest number of galls ? Do you find any 

 on white oaks ? 



In June you have to look closely to find a gall, although it 

 is fully grown. Why is this ? In July you can easily find 

 them. Why can you see them easily in July ? 



OAK APPLES 



While you looked for green galls did you find any last year's 

 galls on the ground ? Did you find anything inside of any of 

 the old ones ? How does the shell of a green oak apple taste ? 

 How does its inner spongy part taste ? 



Enemies of Gallflies. Often, instead of a single red fly, 

 you will get a number of small black flies from a gall. This 

 is because another kind of fly often lays its eggs beside the 

 gallfly's grub. When they hatch, the new worms eat the right- 



