Suggestions about Spraying. 259 



About the first of November, after the leaves had all fallen, the 

 shrubs were again examined to see if any living scales could be found. 

 After a half hour's careful search, one or two young insects were dis- 

 covered and a little distance from these was an old scale, apparently 

 the mother-scale, which had doubtless escaped the spray. On another 

 shrub at some distance from most of the infested ones, several old 

 scales were found with numerous young ones in all stages of develop- 

 ment. 



The fight was again renewed, and on November 16 the shrubs 

 were all thoroughly sprayed, the same as they had been earlier in the 

 season. December 8, the spraying was again repeated; each time 

 great care was taken to strike every part of the shrubs with the spray, 

 the one-to four mixture of kerosene and water being used. 



January 4, 1898, the services of Mr. Slingerland were again 

 requested, and on the shrub last referred to a considerable number of 

 scales, mostly young ones, were found alive, although a rough estimate 

 was made that nine-tenths of them were dead. 



This shrub upon which the most scales were found is one which 

 was not known to be infested until sometime after whale oil soap had 

 been applied to the majority of those infested and consequently this 

 treatment was withheld from the shrub. The foliage was dense, and 

 it was nearly surrounded by vigorous large-leaved shrubs of other 

 species so that the June and July sprayings were doubdess less 

 thoroughly applied than in case of the others which were more 

 exposed, and in consequence more readily treated. 



When this work was first undertaken it was our hope that a com- 

 plete extermination of the foe might be the result, and, indeed, the 

 condition of affairs in July seemed to indicate that our hopes might 

 be realized. It is not surprising, however, considering the extreme 

 rapidity with which the San Jose scale multiplies, that a few of them 

 are now to be found. If only a very small number of scales remained 

 uninjured after the spraying on July 2, the natural result would be 

 a great increase, as there was then several weeks in which reproduction 

 would proceed. So the fact that some scales yet remain does not 

 indicate that the method of treatment is at fault ; it does indicate, 

 considering the work as a whole, that in certain instances it was no^ 

 sufficiently thorough. 



