NEW YORK STATE MUSEUM 3't 



A similar comparison of the average percentage of fruit injured 

 by the second brood and indicated in the tabulation by the word 

 August is as follows: 1.63, .36, and .10 per cent respectively for 

 plots 1, 2 and 3 and 278 for the check trees. 



There is decidedly less difference between the various plots in 

 relation to the characteristic injury by recently hatched larvae 

 designated in the table as shallow. It is as follows: 11.78, 13.56 

 and 12.41 respectively for plots 1, 2 and 3 and but 13.33 for the 

 check trees. This would indicate, as do other data, that the ordi- 

 nary spraying of the season has very little or no effect in prevent- 

 ing this characteristic though minor type of injury. 



Oviposition and temperature. There is a close relation between 

 insect activities and temperature, and this appears to be particularly 

 marked in egg-laying by the codling moth. Conditions in western 

 New York are such that low temperatures may result in a pro- 

 longed period of egg-laying, some 40 days, a condition which 

 greatly increases the difficulty of securing maximum results with 

 the few poison applications. 



Mr Strickland lias been greatly interested in this problem, and 

 through his cooperation we are able to present some interesting- 

 data concerning a number of orchards from approximately the 

 middle of June to the last of July. 



The average duration of the egg stage is 6 or 7 days, though it 

 may be considerably prolonged by cool weather. Normally the egg 

 is reddish 2 or 3 days after it has been laid and the black head of 

 the young larvae may be seen through the shell 1 or 2 days prior to 

 hatching. The figures under " entrance " indicate the number of 

 larvae which have entered the apple and those in the column under 

 " shells/' the number of eggs which have hatched. A scrutiny of 

 each line therefore gives a good idea of the number and condition 

 of the eggs. The tiny, glistening, semitransparent or whitish speck- 

 like eggs have a diameter of a little less than the head of a pin. 

 They occur upon the leaves and are most easily seen upon the 

 smooth surface of the fruit. The temperature records were 

 checked by the operation of a thermograph loaned by the United 

 States Weather Bureau. One was set up on the farm of Mr A. 

 F. Dale located a mile south of Lockport and the other on that of 

 Mr G. W. Mead of Barker. These gentlemen cooperated by mak- 

 ing temperature records at 8 and 9 o'clock and also recorded 

 the maximum and minimum temperatures, the amount of rain, its 

 approximate duration and the direction of the wind between those 

 hours. 



