134 INSECT PESTS OF BERRIES AND GRAPES 



The Strawberry Crown-miner. The species here referred to is 

 regarded by some as identical with Anarsia lineatella Zell, which 

 was described under insects affecting peach. In the strawberry, 

 the caterpillar becomes fully grown in early summer, changing to 

 a small, reddish-brown chrysalis in one of the cavities excavated 

 in the crown or in the dead leaves. The moth, upon emerging, 

 lays eggs in the crowns of several plants, depositing usually but 

 one egg in each. This is done during middle and late summer. 

 These eggs soon hatch and the caterpillar bores into the heart of 

 the plant, remaining in its excavated chamber during the winter, 

 enclosed in a silken cell. Affected plants wither and die. Even 

 if they survive the attack, the plants are weak and worthless. 

 Control. No practical remedy is known. Badly infested 

 plants should be dug up, burned, and new 

 ones planted. New beds should be set 

 each year in new locations. 



The Strawberry Root-louse (Aphis 

 forbesi Weed). This species passes the 

 winter in the egg stage. The eggs are 

 black and clustered on the stems and 

 leaves. They hatch in early spring. The 

 young aphids attack the leaves and later 

 the crowns of the plants. They become 

 adult in about twelve days and then pro- 

 155. The strawberry duce living young (Fig. 155). The second 



root-louse. (Original.) . & / . , rm 



generation is wingless. This generation is 



generally taken to the roots by the corn-field ants, which are 

 attracted on account of the sweet juice secreted by the lice. 



Many of the third brood are winged and are carried to other 

 plants by the wind. Winged forms may also appear at any time 

 when food is lacking. These winged forms start new colonies. 

 The fourth generation appears in early summer and contains some 

 winged forms. The sexual forms appear in the fall, the females 

 then laying eggs, in which stage the winter is passed. 



Injury. Frequently, as a result of the work of this insect, one 

 sees portions of a strawberry bed wither, causing bare spots in the 

 patch, and ants may be observed about infested plants. 



Control. Avoid buying infested plants or using infested plants 

 for starting new beds. If plants with infested roots must be 

 planted, dip the roots in tobacco decoction before planting. If 

 a new bed must be planted near an old infested bed, plow the old 



