New Yoke Agricultural Experiment Station. 



369 



leaves of the opening buds where they are protected from applica- 

 tions of spray mixtures. (Fig. 42.) The most satisfactory prepara- 

 tion from the standpoint of safety to 

 the buds and effectiveness against the 

 insects is three-fourths of a pint of Black 

 Leaf 40 to one hundred 

 gallons of water to which 

 are added from three to 

 five pounds of dissolved 

 soap (Formula 1). 

 Many growers who 

 are spraying at this 

 time for the San 

 Jose scale with the 

 lime-sulphur solu- 

 tion place the nic- 

 otine in the dilute spray material. 

 This is a desirable practice and if it is 

 done the soap may be omitted from the 

 combination. Kerosene emulsion (For- 

 mula 2) is also available for this treat- 

 ment but may not be added to the 

 lime-sulphur solution. 



2. Spraying for adults of the first brood , 



7 77-7 t 1 • • 1 i Fig. 43. — Aphis on cluster of unopened 



and second brood young. — Individuals blossoms; a good time to spray. 



of these stages are very susceptible to 



contact sprays. They are usually 

 active upon the trees during the 

 period extending from the ap- 

 pearance of the color in the 

 unopened blossoms 

 (Fig. 43) to the dropping 

 of the petals (Fig. 44). 

 Very effective work 

 may be done in spray- 

 ^y ing for the lice at one 

 or both of these times 

 with Black Leaf 40 

 using three-fourths of a 

 pint to one hundred 

 gallons of water to 

 which are added from 

 three to five pounds of 

 dissolved soap (For- 

 mula 1) or kerosene 

 emulsion (Formula 2). 



The Black Leaf 40 may be used in the dilute lime-sulphur spray 



for apple scab at either of the periods above mentioned. In such 



instances the soap should be omitted. 



Fig. 44. — Petals fallen; stage for very effective spraying. 



24 



