432 Agrioctltural Experiment Station, Ithaca, N. Y. 



of rain water, the three galloD^s of the fonnnla thus making about 

 thirty gallons to be used in si)iuying. Thb< dilukKi emulsion will 

 l)robably prove the most effective, although the toboicco has been 

 used with equal success in some instances. Care should be taken 

 in the preparation of eith.er insecticide; many of the r('i)orted 

 poor results from th.e use of insecticides is due to their not being 

 properly pi'epared and used. 



As it is the young trees ^hich usually suffer, either insecticide 

 can be easily applied with a knapsack sprayer or small force pumj). 

 Apply in as fine a spray as possible and drench the trees. In rare 

 .ases a .second application a few days later may be necesf*ary. 

 The best time to spray is in April or May when the branch fomis 

 are the most numerous. 



The root forms will not be reached by this method, hence the 

 relief obtained in this way is only partial. There is on record no 

 experiments in the destruction of this form and we have had no 

 opi-ortunity to make any, but we suggest the use of very liberal 

 quantities of the diluted kerosene emulsion on the surface of the 

 soil over the roots jast before or during a rain. This suggestion is 

 based on the results of experiments with a species of White Grub, 

 the larva of Allorhina nitida, an insect closely related to the com- 

 Qion May Beetles of the genus Lachnostema. The lawns about 

 the capitol at Washington hemg badly infested by these White 

 Grubs in 1888, afforded an opportunity to try the effects of a 

 dilute kerosene emidsion applied upon the surface. After apply- 

 ing the emulsion the lawns were thoroughly drenched with water 

 to help carry the oil into the soil. The result was very satisfac- 

 tiory; after a few days the grubs appeared sick, and a month later 

 DO live ones could be found. 



If the aphids on the roots of the trees can not be reached by an 

 application of the emidsion as described above, the trees should 

 be removed at once, burned, and the ground left unoccupied for 

 several months or used for other purposes. The insect could thus 

 be staiTed out as it is not known to feed upon any other cultivated 

 [)lants except rarely the plum. 



In the discussion thus far of preventive measui^es it has been 

 8n])posed that the pest has already gained a foothold in the nur- 

 sery or orchard. However, to many peach giowers in the State 



