198 



Bulletin 396 



much pitted by the feeding punctures of redbugs. Normal redbug work 

 as it appeared on July 3 is shown in figure 43, in comparison with injury 



Fig. 41. YOUNG apples showing the work of lycidea mendax 



FOLLOWED BY AN INFESTATION OF ROSY APHIS 



to three apples which became infested with the rosy aphis. The redbug 

 punctures affected by aphides develop a wound having an ugly white frothy 



scab, but this may eventually heal and pro- 

 duce a badly gnarled fruit. In figure 44 are 

 shown two mature Rhode Island Greening 

 apples which on June 25 appeared exactly 

 as did the injured fruits sho\vn in figure 41. 



VARIETIES OF APPLES INJURED BY LYCIDEA 

 ME AW AX 



The varieties of apples most affected by 

 Lygidea mendax in Genesee County are here 

 given in the order of greatest injur}'- suf- 

 fered : Rhode Island Greening, Northern Spy, 

 Baldwin, Roxbury, Tolman, Tompkins King, 

 Maiden Blush, Twenty Ounce, Esopus, Fall 

 Pippin. 



// E TEROCORD YL US MALI N US 



The dark apple redbug (Heterocordylus 

 malinus) develops from seven to ten days 

 earlier than does Lygidea mendax, and this makes considerable difference 

 in its abilitv to injure apples. The nvmphs hatch with the unfolding 



308 ' 



2«ia»^^ 



Fig. 42. RHODE ISLAND GREENING 

 APPLE SHOWING THE COMBINED 

 EFFECT OF APHIS AND REDBUG 

 INJURY 



