Table 2. Effect of a petal-fall application of Provado on leafminer mines and leafhopper adults 

 and nymphs in Orchards A-F. 



Orchard Treatment 



Combined first- 

 and second- 

 generation leafminer 

 mines per leaf 



Rose 



leafhopper 



adults 



per trap 



Rose 



leafhopper 



nymphs 



per leaf 



White apple 



leafhopper 



nymphs 



per leaf 



A-C 

 D-F 



Provado 

 No Provado 



0.02b 

 0.53a 



22.9a 

 24.1a 



0.02b 

 0.45a 



0.01b 

 0.38a 



*Means in each column followed by a different letter are significantly different at odds of 19:1. 



adults were trapped in blocks of Orchards A-F that 

 received Provado as in blocks that did not, possibly 

 suggesting no negative effect of Provado against rose 

 leafhopper adults (Table 2). However, significantly 

 fewer (only about 1/20 as many) rose leafhopper 

 n5Tnphs and significantly fewer (only about 1/40 as 

 many) white apple leafhopper nymphs were found 

 in Provado-treated than in untreated blocks (Table 

 2). 



Conclusions 



Even though the data reported here were gath- 

 ered from commercial-orchard blocks whose in- 

 tended experimental use was not for the express 

 purpose of measuring effects of Provado on insect 

 pests, the data nonetheless provide compelling evi- 

 dence that a petal-fall treatment of Provado can 

 provide excellent control of leafminers as well as 

 nymphs of both white apple leafhoppers and rose 

 leafhoppers. The excellent control of rose leafhop- 

 per nymphs surprised us, because we anticipated 

 that the effects of application of Provado at petal 



fall during the third or fourth week of May would 

 not extend until mid- or late June to provide con- 

 trol of rose leafhopper eggs or nymphs, which did 

 not appear until mid- or late-June. The effect of 

 Provado could well have been on the eggs or njonphs 

 and not on the adults of rose leafhopper because 

 Provado did not reduce rose leafhopper adult abun- 

 dance as measured by trap captures. We conclude 

 from these 1995 data gathered in commercial or- 

 chard blocks that a single application of Provado at 

 petal fall has excellent potential for providing sea- 

 son-long control of substantial-to-high populations 

 of leafminers, white apple leafhoppers, and rose 

 leafhoppers while (according to New York findings) 

 posing comparatively little threat to beneficial 

 predators. 



Acknowledgments 



We thank Bill Broderick, Dave Chandler, Tony 

 Lincoln, Wayne Rice, Joe Sincuk, and Bob Tuttle 

 for their participation in the tests reported here. 



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10 



Fruit Notes, Fall, 1995 



