626 Report of the Entomologist of the 



of the plants where the poisoned resin-lime mixture was used 

 were nearly perfect, while where the Bordeaux mixture was used 

 the leaf surface had been about one-half eaten awaj. Where 

 the poisoned resin and Bordeaux mixture combined was applied 

 the leaves were as perfect as where the poisoned resin-lime mix- 

 ture was used. This indicates one of two conditions: First, 

 there must be enough of the resin-lime mixture adhering to the 

 under surface of the leaves and not visible to kill the WM)rms, or 

 there is an invisible lilni oti the upper surface holding poison 

 enough to do the work. 



A tinal coniparJson of the tests was made (Jctober 19. A\'here 

 tihe poisoned resin-lime mixture and poisoned Bordeaux mixture 

 plus resin mixture were used, the cabbage has formed heads that 

 are worth saving. 



The difference between the sprayed portion of the field and the 

 portion that was treated with dry Paris green and flour was not 

 marked until after the Second spraying, September IT. This 

 would indicate that the second spraying was made at the proper 

 time to kill the last brood of the imported cabbage-worms. 



At this time (Oclobei- 10) the difference noted September 29 

 is still noticeable. The leaves of the cabbage sprayed with th(? 

 poisoned resin-lime mixture are nearly perfect, while those of the 

 cabbage sprayed with Bordeaux mixture are about one-half de 

 voured. The difference was so marked that it could be seen the 

 whole length of the field. 



It was estimated that one man could prepare the poisoned 

 resin-lime mixture and spray about two acres a day with a knap- 

 sack sprayer. Hence the principal expense would be the time 

 and Paris green. The results showed that, to be complete, at 

 least two applications of the poisoned resin-lime mixture must 

 be made to control the cabbage-^looper. The first application 

 should be made while the plants are small; best while the outer 

 leaves are in such position that both sides can be reached by 

 the spray. A second spraying should be given about the time the 

 heads begin to form. Where all the damage is being done by the 

 imported cabbage-worm alone, one spraying with tliis mix- 



