94 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table VI. — Treatments and dates of application for the codling moth and the plum 

 curculio. One-spray method, etc. Fennville, Mich., 1911 — Continued. 



Dates of application. 



Plat IV. 



PlatV. 

 (Unsprayed.) 



First application, May 12 (after cluster 



buds open). 

 Second application, May 25 (as soon as 



petals dropped). 



Scab treatment. Bordeaux (4-4-50) alone 



Not drenched. Mist nozzles. Arsenate of lead, 

 2 pounds to 50 gallons Bordeaux (4-^-50). 

 Pressure, 125 pounds. 

 do 



TJnsprpyed.) 

 Do. 



Do. 





do 



Do. 









All of the sprayed plats received an early application when the 

 cluster buds opened for control of scab. No arsenate of lead was 

 used with this application. Plats I, II, and IV received three sub- 

 sequent treatments in which arsenate of lead was used with each 

 treatment at the rate of 2 pounds to 50 gallons, the only difference 

 in treatments of these three plats being that on Plat I the lead was 

 used with commercial lime-sulphur, on Plat II with home-boiled 

 lime-sulphur, and on Plat IV with Bordeaux. Mist or Vermorel 

 nozzles were used for spraying these plats and a pressure of about 

 125 pounds was carried. The trees were given a thorough spraying. 

 Plat III, the one-spray plat, was thoroughly drenched during the 

 second application, the only application in which arsenate of lead 

 was used on this plat. A pressure of about 150 pounds was carried, 

 and Bordeaux nozzles were used, giving a coarse, driving spray. 

 This plat- received for this application an average of 16 gallons per 

 tree as against 14 gallons per tree for the same application on the 

 other plats. 



The dropped fruit was picked up from under the count trees about 

 every 10 days throughout the season and carefully examined as to 

 codling-moth and curculio injury. The fruit picked from the tree 

 in the fall was examined in the same way, and the results presented 

 include all the dropped fruit and the fruit picked from the tree. 



THE CODLING MOTH. 



In Table VII are shown the results of treatment of all the plats as 

 to injury from the codling moth, these results being obtained from 

 three Khode Island Greening trees of each plat. The numbers of 

 the trees in the table agree with those in the diagram of the orchard 

 &g- 24). 



