14 CIRCULAR 10 6, U. S. DEPARTMENT OF AGRICULTURE 



spray. Particular attention should then be given to thorough wetting 

 of the alfalfa stubble. 



Since nearly all tree hoppers are hatched by early May, any appli- 

 cation of spray directed against them should be made as soon after 

 that as possible in order to attack the insects in their earlier, more 

 susceptible stages. Even at this time most of the nymphs are in 

 the second stage and a few in the third. Later stages would doubt- 

 less require a stronger spray to be effective. If the oil is to be used 

 upon the foliage and fruit in combination with lead arsenate for 

 the codling moth, only the recommended summer strength should 

 be used. If an application of oil and nicotine is to be used upon the 

 cover crop stubble only, and not upon the trees, a stronger spray 

 may be used if necessary. 



