32 



NEW YORK STATE MUSEUM 



the adults of one appearing in Septemiber^ those of the other in 

 April or May, the latter being the cause of the lodged grain. 



Treatment: late planting in connection with earlier sown decoj 

 strips to be plowed under in late fall. Cut straw high in infested 

 fields and burn the stubble. Clean culture and rotation of crops. 



66 White grubs 

 (Lachnosterna 

 f u s c a , A 1 1 o - 

 rhina nitida). 

 Fleshy^ white, brown 

 headed grubs sever- 

 ing grass roots and 

 those of other plants. 

 These pests fre- 

 quently occur in 

 such numbers as to 

 kill large patches of 

 grass. The parent 

 insects are large 

 brownish beetles or greenish, marked with yellow,, in the case of 

 A.llorhina, which latter occurs in vicinity of New York 

 city. The grub of Allorhina has the peculiar habit of 

 turning on its back and progressing by a peculiar undulating 

 motion whenever it travels. 



Fig. 56 Lachnosterna fusca: 1 pupa; 2 the white grub 

 n its ground cell; 3 and 4 adult May beetle (after Riley) 



Fio. 57 Allorhina nitida: a larva; b pupa; c male beetle; d, e, /, gr minor parts of larva 

 magnified (after Riley) 



Treatment : spray badly infested areas liberally with kerosene 

 emulsion just before a rain. Dig and destroy the grubs. 



