320 



PESTS OF ORCHARD AND SMALL FRUITS 



in summer. Spraying with tobacco extract or kerosene emulsion will 

 kill them. 



Plant Lice on Peach Foliage 



Two species of plant Hce are common on peach fohage. They 

 are especially likely to do notable injury in the spring, clustering 

 on the tender shoots, curling the leaves, and sometimes dwarfing and 

 distorting the forming fruit. 



The Green Peach Aphis (Myzus persicce Sulz.) hatches in early spring 

 from eggs laid in crevices of the bark. The first lice are pink, but the 

 next generation are light green, often with darker green stripes across 

 the abdomen. These in turn give birth to a third brood, many of 



which, unlike the preceding, have wings. 

 The latter fly to new food plants, and 

 for the next two or three months breed 

 on various garden crops, such as to- 

 matoes, spinach, cabbage, and many 

 others. In the fall another winged gen- 

 eration returns to the peach or other re- 

 lated trees, and the winter eggs are laid. 

 The measures of control are spraying 

 with 7 per cent kerosene emulsion or 

 with tobacco extract when the lice are 

 first observed. 



The Black Peach Aphis (Aphis persicw- 

 niger Er. Sm.) lives the year round on 

 peach. It differs from the preceding in 

 the fact that colonies are maintained on 

 the roots both summer and winter, as 

 well as the colonies on the leaves and 

 twigs in summer. The full-grown aphid 

 is shining black. Control of this species 

 must be directed toward the root-inhabiting forms as well as those 

 above ground. In fact the former are often much the more abun- 

 dant, while few or none may be seen on the foliage. See page 229. 



Fig 493 

 Aphis. 

 inal. 



— The Black 

 Aerial form. 



