Report of the Entomologists. 609 



Test of Spraying Mixtures for the Striped CucuMBER-BEBTua 



June 12. Several rows of cucumber vines, which had. only one 

 leaf besides the seed leaves, were sprayed with poi- 

 soned Bordeaux mixture. A number of rows which 

 were nearly ready to run were also sprayed with the 

 same mixture. Only the tops of the leaves were 

 reached, hence the work was poorly done. 



June 13. No dead beetles to be found; no apparent injury to the 

 plants. 



June 14. Heavy rains. Bordeaux mixture all washed off. 



June 16. Resprayed the above vines, spraying once from each side 

 and once on top of the row, with same mixture as 

 used on the 12th inst. 



June 17. Heavy rain. 



June 18. No dead beetles to be found, but apparently the live 

 beetles are not as numerous around the sprayed as 

 they are around the unsprayed vines. 



June 20. Still no dead beetles to be found around sprayed vines. 



June 20. Sprayed with a poisoned resin-lime mixture a number 

 of vines, both small and large, which had not been 

 previously sprayed. 



June 22. No dead beetles to be found around the vines sprayed 

 June 20, but they avoid these about the same as they 

 did those that were treated with Bordeaux mixture 

 Although the beetles appeared to avoid the leaves to 

 which the above mixtures were applied, they were 

 not prevented from working in the loose earth at the 

 base of the plants. Hence these tests indicate that 

 the above mixtures will not kill cucumber-beetles or 

 even prevent them from depositing their eggs on the 

 vines. 



Test of Spraying Mixtures for Colorado Potato-beetle. 



July 2. Sprayed some rank growing potato vines with Bordeaux 

 mixture. Placed the vines in cage and put about fifty 

 young Colorado potato-beetles on the vines. 

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