1§2 STATE BOARD OF AGRICULTURE. 



of the house-fly. There are a number of generations each year, the last 

 generation passing the winter in the pupal stage. 



Fig. 7. — Adult of beet leaf-miner, enlarged. (Author's 

 illustration.) 



Fig. 8. — Beet leaf-miners. Mine in leaf. 

 Original 



REMEDIES. 



The fact that the winter is passed under fallen leaves in the field, 

 suggests the destruction of such rubbish by plowing immediately after 

 harvesting the beets. No benefit seems to have resulted from sprays, 

 thus far. Fortunately the damage is usually restricted to spoiling the 

 tops for greens. 



Blister-beetles. 



Old-fashioned Potato-beetle {Epicauta vittata). 

 Ash-grey Blister-beetle {Macrobasis unicolor). 

 Black Blister-beetle (Epicauta pennsylvanica) . 

 Margined Blister-beetle {Epicauta cinerea). 



We have in Michigan four difl'erent kinds of blister-beetles, viz.: 

 the ash-grey, the margined, the black, and the striped or old-fashioned 

 potato-beetle. All of these blister-beetles feed on the beet and on various 

 other plants. They seem to prefer members of the clover family; sweet- 

 clover, vetches, etc., which they attack during the latter half of July 

 and August. The black species is found on golden-rod in great numbers, 



