New York Agricultural Experiment Station. 417 



Treatment for oyster-shell larlc-louse. — Treatment may be made 



in the spring by spraying tbe trees as soon as the eggs hatch, 



either with whale oil soap, one pound to seven gallons of water, 



or kerosene emulsion, one part to seven parts of water. One or 



more applications should be made as required. For treatment of 



scurfy bark-louse, see page 450, and for San Jose scale page 449. 



General Tueatment Against Diseases and Insects wiiich Attack the 



Apple. 



When to spray . 



1. Just before leaf buds burst. 



2. Just as leaf buds show green at the 

 tips. About a week later than 1. 



3. Just before blossoms open. From 

 seren to ten days later than 2. 



4. Just after blossoms fall. 



5. From ten to fourteen days after 4. 



What to use and what the treatment is for. 



Paris <i;recni2 against bud moth and 

 case-bearers. 



Bordeaux mixtureis against scab, 

 canker disease and leaf spot. 



Paris green^s against bud moth, case- 

 bearers, canker worms, tent cater- 

 pillar and various other leaf-eating 

 insects. 



Bordeaux mixture^s against scab, and 

 leaf-spot. The most important single 

 application. Apply thoroughly. 



Paris grecni2 against canker worms, 

 tont caterpillar and various other 

 leaf-eating insects. 



Bordeaux mixtureis against scab and 

 leaf-spot. A very important appli- 

 cation ; make it promptly and thor- 

 oughly. 



Paris greeni2 against codling moth, 

 canker worms, tent caterpillar and 

 numerous other leaf-eating insects. 

 The most important application 

 against codling moth. 



Bordeaux mixturei3 against scab and 

 leaf -spot. If weather has been cool 

 and wet, apply with especial thor- 

 oughness. 



Paris greeni2 against codling moth. 



J2 Paris green should be used at the rate of one pound to 150 gallons of 

 water. If used alone, about two pounds of fresh slaked lime should be added 

 to make it adhere and to prevent injury when applied to foliage. Green ar- 

 aenite of copper, arsenite of lime, or other poison may be used instead of the 

 Paris green, as directed in Bulletin 121. Paris green or the other arsenieals 

 may be u«ed with Bordeaux mixture. In that case, it is not necessary to add 

 much extra lime. 



13 Use Bordeaux mixture 1-to-ll formula. Pure copper sulphate solution, 

 1 pound to l.*) gallons or more, may be used when there is no foliaee. It is 

 cheaper, but does not adhere so well as does Bordeaux mixture. Directions 

 for making and applying these mixtures are given in Bulletin 121. The Paris 

 green or other arsenieals may be mixed with the Bordeaux mixture, and both 

 may be thus combined in one application. 



27 



