!N^E\v York Ageicultueal Experiment Station. 275 



Green arsenite and lead arsenite, used in water, at the rate of 

 one-half pound to 48 gallons, killed the squash vines sooner than 

 where applied dry. Very few dead beetles were found around the 

 plants sprayed with arsenites in water, while plenty were found 

 dead around plants dusted with green arsenite. Lead arsenite, 

 used dry, did not kill the vines as soon as did the dry green ar- 

 senite, but no dead beetles were found where the former was used. 



The cucumber beetles did not find the vines at Floral Park 

 until June 14. Though they were quite numerous after this date, 

 not a solitary hill of muskmelons was lost by their work. Enough 

 squashes were kept growing on the margins of the field to furnish 

 them with all the food they required. Plate XIX shows one side 

 of this field taken July 19, with squash plants on margin. 



In no case could I find the larvas working at the base of any of 

 the melon plants, but by the middle of August they were quite 

 plentiful on the underside of the fruits. 



By the middle of October the beetles were so numerous that 

 they destroyed all the late set fruits. 



The cucumbers at Hicksville were injured by Bordeaux mix- 

 ture used (l-to-8 formula). Later sprayings (1-to-lO and 1-to-ll 

 formulas) did no harm. 



Large numbers of the striped beetles were killed where the first 

 application of green arsenite was made June 11. A few dead 

 beetles were found around squashes dusted with green arsenite 

 June 16, but none were to be found around plants which were 

 dusted with lead arsenite, or even where both arsenites were used 

 in water. Squash plants sprayed with copper and lead arsenites, 

 at the rate of one-fourth pound to 48 gallons of water, were only 

 slightly injured, while in cases where both substances were used 

 dry, the plants were killed. 



I never saw such myriads of the striped cucumber beetle as 

 occurred on this field. On the acre of cucumbers planted June 3 

 nearly every hill was saved, while on that planted June 7 about 

 one-half of the acre had to be replanted three times in order to 

 get a stand. Two factors combined to produce the failure to get 



