Colony size (number of live aphids) for 100 cone-shaped galls of Nipponaphis monzeni collected on 2 June 2008 (a) and 31 March 2007 (b). Those galls that contained zero, from one to five, from six to 20, and more than 20 dead aphids are indicated by white, light gray, dark gray, and black areas, respectively, on the bars.
