cold, the more wet must be the location chosen. Also, if the 

 weather be hot and dry as it usually is in mi.istmimer, ihe 

 mere clipping and drying of the stubble on the bare gionnd 

 for weeks is likely to kill all or most of the larvae. 



A similar case where the Bureau of Entomology as a moan.^ 

 of control, recommends the eradication of an early foodplarit, 

 and where instead the using of that early foodplam for a trap- 

 patch turns failure into success is to be found in what is iheir 

 solution of the problem of controlling chalcis ny infestation in 

 alfalfa seed. This problem and its solution, as giv.en by the 

 Bureau is discussed in Farmers' Bulletin No. 63G. 



As to food plants: "The cloverseed chalcis-fly confines 

 its work entirely to the seeds of clover, bur clover and alfalfa 

 , . . "(p. 3). "Mr. F. M. Webster shows the distribution of 

 the alfalfa-seed chalcis as probably covering the entire United 

 States" (p. 3). 



The following list of means of control is given : "Har- 

 vesting severely infested crops "(that is, avoid trying to grow 

 a seed crop)," clearing fence lines and ditch banks; winter cul- 

 tivation, destroying the screenings, burning fences and 

 checkridges, planting clean seeds, cutting the seed crop "(at 

 such time as the most possible can be gotten out of it, what- 

 ever that may be)," destroying burclover, cleaning the seeds* 

 and necessity of organized efforts." 



As for the value of destroying burclover as a means of 

 control, you read on page 9 : "In some localities bur clover 

 grows abundantly and matures its seed pods in early spring. 

 The chalcis-flies thus have already completed the development 



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