138 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



at picking time, was taken into account and classified as to injury or 

 otherwise. Also the work of the two broods of the codling moth was 

 carefully separated by removing from the trees at the period of 

 maximum maturation of the first-brood larvse all fruit injured by the 

 first brood, thus eliminating entirely from later counts first-brood 

 work. The infested apples, however, were placed on the ground 

 under the respective trees, so that development of second-brood 

 larvae would be in no wise interfered with. 





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Fig. 37.— Diagram illustrating arrangement of plats and position of trees in the E. H. House orchard, near 

 Saugatuck, Mich.: D, Beft Davis; B, Baldwin; W, Wagener. Count trees are indicated by circles, the 

 numbers agreeing with those in the tables. 



The treatments given and dates of application are indicated in 

 Table XIX. 



Table XIX. — Dates of applications for the codling moth and plum curculio, one-spray 

 method. Saugatuck, Mich., 1909. 



Date of application. 



Plat I. 

 (Unsprayed.) 



Plat II. (Demonstration.) 



Plat III. (One-spray method.) 



First application (before 



blossoms opened), 



May 20-21. 

 Second application, 



June 3-9, after falling 



of petals. 



Third application, June 

 21-22. 



Fourth application, 

 August 7-9. 



Unsprayed 



do 



do 



do 



Not drenched. Vermorel noz- 

 zles. Mist spray. Bordeaux 

 mixture (4-4-50). 



Not drenched. Vermorel noz- 

 zles. Mist spray. Arsenate 

 of lead, 2 pounds to 50 gal- 

 lons Bordeaux mixture 

 (4-4-50). Pressure, 125 

 pounds. 

 do 



do 



Drenched. Bordeaux nozzles. 

 Coarse spray. Bordeaux mix- 

 ture (4-4-50). 



Drenched. Bordeaux nozzles. 

 Coarse spray. Arsenate of 

 lead, 1 pound to 50 gallons 

 water. Pressure, 175 to 200 

 pounds. 



Bordeaux mixture only (4-4- 

 50). June 10-11 and again 

 June 21-22. 



Bordeaux mixture only (4-4- 

 50). 



