75 



a loii<j, hard, and soiiict iiiics iliscouraj^inji' warfare in l!i(»J a;,Miiist 

 iho " hoppers, " we (h'liioiish ale<l that they can he elVeel ively, practi- 

 cally, and elieai)ly eoiiti-olled. TIm- details of our work will appear 

 ill Bulletin No. l'L") of tlie C'ornidl Kxperinicnt Station. 



We (inally (h>vised a larjjfc, practicable, st icky shield (li^-. 1) for 

 catchinii: thousands of the adult "hoppers" in the spriui^' on eonsid- 

 erahle aivas. The 1roul)le with many of the previous recommendations 

 foi- this ])est is that they ai-e impi-actical)lo or too expensive to operate 

 in lar,ij:e \ ineyards. We could not, <>:et New York vineyardisls with 10 

 to iiMt acres of vines to use a stiekv fan or shin<;le. We were unalde 



\ i'r:ic(ical)k', Inru-' 



iiiiciit Micky shirl.l for ciiiilnrii);,' inltilt trniiic Inif-lKipiMTN in the 

 spriii),' (friini plioto l>y aiitlmri. 



to kill many of the adult " hop|)ers"' with a sju-ay oi- dust of any kind 

 thai did not injure the leaves, until we finally tried i|i(. cowardly 

 schenu' of " hittinjx them when they were (h)wn"with a i'."> percent 

 mechanical mixture of kerosi'iie. We found that a •"> pei- cent 

 kerosene mixture would n(»t injure the leaves aM<l would brinu the 

 "hoppers" t<» the <,M()und, wliere tliey would remain a few moments 

 wipinj; it olT. Continuing; this to the end of a r<)w of vines, the pump 

 was set to thi-ow -2') [)er cent of oil, an<l .iioini; back the same row. this 

 spray was directed at the ''hop])ers" on the irrouml. We kiih'd 

 thousands of them in this waN", but soon found that none ot' the 



