Crown-gall Studies of Resistant Stocks for Prunus 
Plate 3 
A. —Artificial hypertrophies on a resistant variety of Prunus mums (S. P. 1.47950). 
Enlarged about twice, to show small incipient galls. The puncture wounds have 
healed, but near their margins are these small pointlike growths. August to De¬ 
cember, 1922 
B. —Artificial galls on P. armeniaca mandshurica, to show form characteristic of a 
somewhat resistant variety of Prunus. The hypertrophies are developed at the 
margins and in one case at nearly right angles to surface of host. X 2. July to 
December, 1917 
,.C.—Small hypertrophies on Prunus armeniaca mandshurica, to show small point¬ 
like growths on margins of healing tissue. X 2. June, 1916, to March, 1917 
iL D -—Small galls in Prunus domestica (Italian prune), to show nature of galls as 
they often develop. For illustrations of larger galls see (5). July to December, 1913 
E.—Small galls on Prunus domestica (German prune). While these are typical 
galls in shape, their size is small. May to December, 1915 
