CONTENTS. 1 



Page. 

 Spraying experiments against the grape leafhopper in the Lake Erie Val- 

 ley Fred Johnson . . 1 



Introduction 1 



Characteristics and habits of the grape leafhopper 2 



Life history 3 



Hibernation 3 



Spring emergence of adults 4 



The egg stage 5 



The nymphal stages 6 



The adult 6 



Remedial measures 7 



Spray applications against the nymphs 8 



Conclusion 12 



Life history of the codling moth and its control on pears in Califor- 

 nia S. W. Foster. . 13 



Introduction 13 



Life-history notes on the codling moth in California 14 



Overwintering larvae 14 



Spring brood of pupa? 14 



Spring brood of moths 17 



The first generation 18 



The second generation 24 



Review of life history for the years 1909 and 1910 26 



Natural enemies 32 



The control of the codling moth on pears in California 32 



Effect of sprays on places of entrance into pears by larvae. .. r 33 



Commercial results from spraying 41 



Summary and recommendations 51 



Vineyard spraying experiments against the rose-chafer in the Lake Erie 



Valley Fred Johnson . . 53 



Introduction 53 



Habits of the adult 54 



Habits of the larva 56 



Remedial measures 57 



Handpicking the beetles 57 



Spraying with arsenicals 58 



The use of sweetened arsenicals 62 



Time to make the spray applications 63 



Cleaning up breeding places 64 



Summary ,. . . . 64 



The California peach borer Dudley Moulton . . 65 



Introduction 65 



Distribution and food plants 66 



Distribution 66 



Native food plants 67 



1 The seven papers constituting this publication were issued in separate form on Mar. 31, Apr. 1, Mas 

 17, Oct. 17, and Nov. 6, 1911, and Feb. 24 and May 4, 1912, respectively. 



VII 



