NURSERY AND ORCHARD INSECT PESTS 



27 



and exposed roots with one part of lime-sulphur solution to ten parts of white 

 wash solution. If applied with a sprayer it should be made thinner than if 

 painted on. When dry, mound up about the trees. One pound of arsenate of 

 lead may be added to every ten gallons of the paint or wash. 



San Jcse Scale. This pest and its control on peach is largely a duplication 

 of its work and control on apple. Peach nursery stock infested with or ex- 

 posed to the scale should be treated the same as apple stock. 



Plum Curculio. The life cycle and habits of this pest have already been 

 discussed under apple insects. The pest breeds most abundantly in peaches and 

 plums and special effort should be made to prevent it from developing in these 

 fruits. Clean culture, destruction of wormy windfalls, jarring where practical 

 and shallow cultivation in July should be supplemented with the use of arseni- 

 cal sprays to poison the adults as suggested on apple.. The peach foliage is 

 more easily burned than that of apple so greater care must be taken with mix- 

 ing and applying sprays to peaches. The fuzzy nature of the peach enables it 

 to hold the poison better than either apple or plum. Where curculio injures 

 peach the spray application given when most of the shucks of collars are off 

 the young fruit and the application given one week to ten days later are the 

 most effective applications. They should include about one pound powdered 

 or two pounds paste arsenate of lead to fifty gallons of the 8-8-50 self-boiled 

 lime-sulphur solution. Do not use the ordinary commercial lime sulphur for 

 spraying peaches when in leaf as it injures foliage. As a dormant spray, how- 

 ever, it is all right for controlling San Jose scale. 



Tarnished Plant-bug. This pest has already been discussed more espe- 

 cially as a pest of nursery stock. Peach nursery stock suffers more than other 



FIG. 30. Peach-twig Borer showing larva, pupa and 

 injured peach bud. (After Marlatt) 



FIG. 31. Black Peach Aphis; 

 peach tree showing lice on roots 

 (After Smith) 



