of an entire generation in the seeds of these plants before the 

 alfalfa seed pods have developed in the fields. Under such 

 conditions it would be well to destroy the burclover pods by 

 burning the fence lines in the spring. This can frequently be 

 done after the plants mature and before the alfalfa seed crop 

 comes on." 



With all vegetation then in sap, it is up to the Bureau to 

 show how "it would be well" to try to burn the fence lines. 

 Palpably what burclover would be growing in fence lines 

 would represent only a small part of the total in the vicinity 

 of the alfalfa field and burning such plants mixed with green 

 ones is out of the question. 



If a trappatch of burclover be sown, this will attract the 

 bulk of the flies and if allowed to mature seed it will as stated 

 by the Bureau develop an entire generation to later find its 

 way to the alfalfa. On the other hand if this burclover be cut 

 before the larvae are sufficiently developed as not to be affected 

 by the drying of this food supply through cutting, this will kill 

 them. This, especially if also surrounding volunteer burclover 

 be cut, will, necessarily, to a certain extent ,protect the alfalfa. 

 But with the blooms and young seeds thus cut, the flies then 

 yet emerging from hibernating quarters or from early breed- 

 ing places, possibly including white clover, not destroyed 

 while in bloom, will oviposit on "clover," probably including 

 white clover, then also inviting oviposition, and intermediate 

 in time of blooming between burclover and alfalfa, hence to 

 protect the alfalfa well, a patch of clover of a kind that is inter- 

 mediate in bloom between burclover and alfalfa must also be 



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