BORING IN THE CROWN 233 
The Strawberry Crown-borer (Tyloderma fragarie Riley) 
The inside of the crown of strawberry plants is hollowed out by a 
white, thick-bodied grub, one fourth of an inch long, with a brown head. 
The adult is a small, dark 
beetle, one fifth of an inch long, 
with three darker spots toward 
the outer edge of each wing 
cover. It emerges in the fall, 
hibernates, and lays eggs in the 
Fig. 297.— Adult of the Strawberry 
Crown-borer. Enlarged and nat- 
ural size. Original. 
spring. Usually only older 
plants are infested, because egg 
laying is over by the time that 
. 5 Y 
runners formed in midsummer : 
have made any growth. There Frc. 298.—Work of the Strawberry 
is one generation annually. Seno neltors -Anetiel 
The adults are unable to fly. Therefore, if old beds are attacked, 
care should be taken to make new plantings at some distance, and to 
use only new runners, which will not usually be found infested. In 
discarded beds the plants should be plowed out at once after the pick- 
ing season, raked into piles, and burned. This should be done not 
later than August, in order to kill the insect while still in the crowns. 
Where beds are moved every two or three seasons, no trouble need be 
feared from this insect. 
