SPRAY AND PRACTICE OUTLINE. 



Special Bulletin No. 114. 



BY C. p. HALLIGAN^ R. H. TETTIT AND G. H. COONS, 



Spraying Apple Orchards. 



DORMANT spray. 



A "dormant" spray should be applied to all orchards where oyster- 

 shell, San Jose, scurfy or other scale insects are found. The oyster- 

 shell scale in the commercial apple orchards of Michigan is now more 

 common than for many years past, and San Jose scale has again be- 

 come more prevalent the past year. While growers who are positive 

 that no scale is present may omit this ^pray, it is a safe practice to an- 

 nually apply a dormant spray. Growers should inspect their orchards 

 carefully during the winter or early spring to see if any of these scales 

 are present thus necessitating the application of a "dormant" spray. 

 If you cannot identify these scales, send twigs or a strip of the bark to 

 the Entomologist, Michigan Agriculture Experiment Station, East 

 Lansing, where they will be identified for you free of charge. 



The "dormant" spray, if scale is found, sbouhl be put on in early 

 spring just before the buds show green. The later it is applied with- 

 out injury to the trees, the greater its efficiency as an insecticide and 

 fungicide. Lime -sulphur solution HV-/i-^)0), Scalecide, or Soluble Sul- 

 phur may be used for the control of scale. It is very essential to be 

 thorough in its application, covering every part of the iwigs, branches 

 and trunk. 



SUMMER sprays. 



A pre-pink spray, — is recommended 

 for all varieties very susceptible to 

 scab, being applied just as the blos- 

 som buds have begun to separate in 

 the cluster, to control the primary 

 infection of scab. 



For this spray use bordeaux-mix- 

 ture or lime-sulphur (li/i-SO). 



Fig. 1. Clustor buds at the "pro-pink" stage. 

 This shows the stage of bud development at 

 which the "pre-pink" spray should be ap- 

 plied. 



