122 THE STRAW r,i-:Rm- \\i-:i-:\'ir. ix mixxksota 



altlidU^h it may look healthy, and a])])arc-ntl\- Ivvc from ])a^a^itic 

 hir\ae. I-Lxaniinati( m usually re\-eals tlit- small hir\ae < >n tin- hodv. 

 suckiui^- the juices. In some cases onh- cl^i^s of the i)ara.sites were 

 tound on or near the wee\'il larva, ^•et it alread\' ajjpeared dead. 



Many of the buds (about 10 or 15 per cent) do not fall. i)Ut 

 remain hanging. These are (|uite cons])icuous because the\' turn 

 brownish w hen dry. L'i)on examination, alxjut 50 ])er cent oi them 

 contained lar\a, while in the others nothing- was found, ])robabh- 

 owing' to their haxing dried out. AIan\- of the buds, u])on falling 

 to the ground, are so covered with lea\es that tluw remain \ery 

 moist, and although in some instances fungus threads were found 

 in the bud, the lar\a was ap])arently ver} healthy, showing that it 

 can withstand \ery moist conditions. This was further substan- 

 tiated by the fact that a lar\a. upon hatching, Ined for four davs 

 in water. 



REMEDIAL MEASURES. 



I'rofessor Headlee {l^)\()) summarizes the control measures 

 recommended for the strawberry \vee\il, and points out that they 

 are inadecpiate to meet the demands of practical growers or are 

 impractical in other ways. 



Effect of Burial of Adults. 



Since the adults hil)ernate within the helds, and since the old 

 fields nmst be cultixated to be renewed pro])erlv, it is of consider- 

 able importance to know the etiect of burial on the adults. Labor- 

 atory ex])eriments were conducted b\- i)Utting adults and Inids 

 containing wee\ ils in the bottom of three-inch pots, and co\ cring' 

 them with two inches of soil. The pots were watered after burial 

 and co\ered with cheesecloth, h'ixe da\s later, the weexils were 

 ali\e at the bottom of the i)ots ; two weeks later the\- were dead, 

 most of them at the bottom of the pots, although a few appeared 

 to burrow upwards as much as one-eighh of an inch. This experi- 

 ment indicates that the adult weexil has little abilitv to emerge 

 when covered with soil, and this appears to be substantiated imder 

 field conditions, for in a bed that was thoroly renewed and culti- 

 \ated only one wee\il was found in the field on November 1. while 

 in an adjoining field that was not a renewed one, hftv wee\'ils were 

 found. Furthermore, the burial of the adults as a means o\ control 

 can be accom]dished by plowing under the old infested beds. Since 

 the weexils do not fty, but fall to the ground on the slightest dis- 

 turbance, they, as well as the larvae, can all be destrcjyed by ])low'- 

 ing them under soon after picking the strawd:)erries. 



