167 



(ides. Kerosene emulsion diluted 9 times has been used successfully 

 ill one case on the mature scales, just before tbe young larv;e emerged. 

 Diluted from 11 to lo times it has proved ineffective on half-grown 

 forms; but diluted not more than 5 times it has proved effective against 

 all the scales on the trunks. 



T see no reason why during the coming winter the San Jose scale 

 should not be practically exterminated in New Jersey. 



It is too early to speak of the life history of the species in Xew Jersey. 

 Young larvae appeared early in June, and again early in August, 



Dr. Lintner expressed himself as greatly interested in the preceding 

 jjapers, and queried if there were not a possibility of the dissemina- 

 tion of the scale from California or other infested districts on fruit. 

 He concluded, however, upon a general survey of the possibilities, that 

 the chances of the scale carried about on fruit reaching a tree on 

 which it would successfully establish itself were so slight as to be 

 practically not worth consideration. 



Mr. Marlatt, referring to the discussion of the methods taken by 

 nurserymen to rid their trees of the scale, and the statement by Mr. 

 Smith of the completeness of this work, suggested that there was some 

 danger in placing too much confidence in the work or the statements 

 of nurserymen in this particular. Mr. Marlatt pointed out the great ease 

 with which one or two scales on a tree could be overlooked, even by 

 an experienced entomologist, as illustrated by the case referred to by 

 the author of the paper, in which he had concluded that certain trees 

 which had been infested were entirely free from the scale, until later 

 ho happened to examiue the fruit and found the scale was quite abun- 

 dant on it; and he then also discovered that it occurred on the tips of 

 the smaller twigs. 



Mr. Smith stated that in the case of the large trees referred to, on 

 which he had at first failed to find the scale, he was misled by the fact 

 that the scale had been entirely exterminated on the twigs and larger 

 branches, and had not taken the trouble to examine the smaller twigs, 

 knowing that the scale habitually confined itself to the older i^arts of 

 the tree; but in tlie case of nursery stock examination was much more 

 easy, and he thought it quite possible to determine whether the scale 

 had been completely eradicated or not; he stated further that the prac- 

 tice of nurserymen was to cut their stock back so vigorously before 

 sending it out, that examhiation was much simplified. 



With reference to the localities in Xew York where this scale had 

 a])peared, mentioned by Mr. Smith, Mr. Banks said that he had seen 

 notices in the New York Times, three or four weeks since, of the occur- 

 rence of the scale in three distinct localities, with the accompanying 

 statement that active and thorough measures had been taken to exter- 

 minate it. 



