February, '19] britton and zappe: kerosene v. nicotine 81 



outer covering of the egg has split and the egg has become very sus- 

 ceptible to destruction by the delaj'^ed winter-strength lime-sulphur and 

 nicotine treatment. Our experience of the past three years shows 

 that the eggs of the rosy apple aphis and of the green apple aphis have 

 not all hatched by the time the green bud stage has been reached. We 

 endorse the recommendation of Professor Parrott that the trees be 

 thoroughly sprayed at the green bud stage with a mixture composed 

 of winter-strength lime-sulphur and nicotine because the eggs which 

 have not yet hatched are at that time in a very susceptible condition. 

 We do not agree, however, with Professor Parrott in that the nicotine 

 should be used at the rate of 1 to 1,000, but have been compelled, by 

 the evidence of three years' experience, to advise adding 40 per cent 

 nicotine to winter-strength lime-sulphur at the rate of 1 to 500. It 

 may be that the difference between our experience and that of Professor 

 Parrott is due to ecological difference, incident to the difference in 

 geography. 



Mr. p. J. Parrott: Do you use that one to eight? 



Mr. T. J. Headlee: We used 1 part of the commercial lime- 

 sulphur to 9 parts of water and added to it 40 per cent nicotine at the 

 rate of 1 to 500. 



Mr. C. p. Gillette: The peach aphis hatches very early in the 

 season. It is not uncommon to find mothers giving birth to the young 

 by the time the buds are open. They can be killed on any of the pit 

 fruits such as peach, plum or cherry by an early spray. The false 

 cabbage aphis is in Colorado an inhabitant of Cruciferous plants. 

 The peach aphis is the most general feeder that we have as it feeds on 

 something like 75 host plants.' 



Adjournment. 



Morning Session, Friday, December 21 , 1918, 10.35 a. m. 



The association met in joint session with the Section on Horticultural 

 Inspection. Mr. E. C. Cotton, Chairman of the Section, presided. 



Vice-President E. C. Cotton: As I have not prepared an address 

 for this occasion, we will listen to the papers listed on the program. 

 The following paper will be read by Mr. E. N. Cory, on "The Status of 

 the Oriental Peach Moth." 



THE STATUS OF THE ORIENTAL PEACH MOTH ' 



By E. N. CoHY, College Park, Md. 



Grave apprehensions were entertained in the last few years as to the 

 damage which might result from the establishment of Laspeyresia 



» Contribution from the Maryland State College of Agriculture. 

 7 



