INSECTS INJURIOUS TO THE STRAWBERRY 



391 



and so rarely becomes a serious pest or remains so for a period 

 of years. 



The best method of avoiding loss is to set out uninfested 

 plants on land as far removed from infested beds as possible. 

 Plants can be freed from the lice by dipping them, after the 



FIQ. 326. Eggs of strawberry root-louse on FIG. 327. Strawberry root-lice which nave 

 leaf stem. been killed by parasites, with one of the 



little parasitic flies which has just emerged . 



eggs have all hatched, in a solution of tobacco. Plants may 

 also be freed from aphids by fumigation with hydrocyanic acid 

 gas (see Delaware bulletin by the senior author). The aphids 

 in an infested bed may be largely destroyed in the spring by 

 scattering straw over the bed and burning before growth has 

 started. There is little danger of injury to the plants if this 

 is properly done. 



The Strawberry Crown-borer * 



Strawberry plants are often dwarfed or killed by a small white 

 larva which mines out the interior of the crown, hollowing it out 

 from the bases of the leaves to the larger roots. Usually but 

 one grub is found in a plant, and it looks very much like a small 



* Tyloderma fragrarioe Riley. Family Curculionidoe. See S. A. Forbes, 

 12th Report 111. State Ent., p. 64; 13th Report, p. 142; H. Garman, Bulletin 

 80, Ky. Agr. Exp. Sta... n. 261. 



