474 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 3 



RECENT EXPERIMENTS WITH THE CODLING MOTH 



By E. P. Felt, Albany, N. Y. . 



Last year we summarized the work against this pest and were able 

 to present records showing 98.55 to 98.81% of worm-free fruit as a 

 result of one spraying, while check trees yielded 72.73% of sound 

 apples. The same care was exercised in selecting the trees in 1910 

 as the preceding year (see Journal Economic Entomology, 2:172-73) 

 and in the case of series 1 the experimental trees were in the same 

 orchard, though it was necessary to spray Northern Spy trees . instead 

 of Baldwins. Series 2 was limited to Baldwins, while small Wealthy 

 and Mackintosh trees were used in series 3. Practically without 

 exception arsenate of lead (15% arsenic oxide) was used at the rate 

 of about 6 lbs. to 150 gallons of spray. One gallon of a concentrated 

 lime-sulfur wash (about 30° Beaume) was used as a fungicide in series 

 1, while in series 2 the normal Bordeaux mixture was employed for 

 this purpose. Plot 1 in both series 1 and 2 was sprayed once just 

 after the blossoms fell, while plot 2 in each of these series received 

 an additional application about three weeks later, namely in early 

 June. Plot 3 in series 2 was sprayed only once and that in early 

 June at the time of the second spraying in plot 2. The treatment 

 of the trees in series 3 was practically identical with the spraying 

 described above for plot 1 in series 1 and 2. 



The season of 1910 was remarkable for the development of a large 

 second brood and consequent prevalence of wormy apples. In some 

 unsprayed orchards over 50% of the fruit was thus affected. May 



SUMMARY OF PLOTS 



