532 



NEW JERSEY AGRICULTURAL COLLEGE 



that SAvarm on the trees as larvge in early October, and these are the 

 insects to be aimed at. The fact that no reproduction takes place 

 until after June 10th, and that when it does begin almost every 

 female is at work within a week, indicates a remarkable uniformity in 

 the state of the development of tlie hibernating forms. 



As to the insecticide, that may be anything that the fruit-grower 

 is familiar with and in which he has confidence. Personally, I prefer 



the soluble oils, elsewhere 

 described in this report, 

 and they are probably 

 almost equally effective. 

 K.-L., properly made and 

 thoroughly a])plied, would 

 come next in order, and 

 then the lime and sul- 

 phur combinations. If 

 the regular boiled mix- 

 ture is to be used, the 

 amount of salt may be re- 

 duced to one-fourth of the 

 normal quantity, assum- 

 ing that the formula rec- 

 ommended by me is used. 

 The self-boiled mixture, 

 without salt, may be used 

 if carefully made, but the 

 caustic soda formula had 

 better be used experi- 

 mentally only. It is be- 

 lieved to be the caustic 

 soda that causes injury to 

 fruit buds, and for that reason no wash containing any large per- 

 centage of it can be considered safe. On peach orchards the lime- 

 sulphur mixtures have a claim to first place because of their influ- 

 ence on leaf curl and otJier troubles, and because, somehow, they 

 seem to improve the condition of the trees. 



Whatever is used should be applied as thoroughly as may be, and 

 the spray sliould be driven into the trees with as much" force as 

 possible. One application. Oetoljer lotli, and a second, November 1st, 



Fig. 3. 



Ecale on a branch, showing adult females and recent 

 sets. Much enlarged. From Bull. Va. Sta. 



