REPORT OF THE STATE ENTOMOLOGIST [916 43 



The meteorological observations were made under typical orchard 

 conditions and the data secured from representative localities make 

 possible a fairly accurate comparison of temperature changes in 

 particular throughout the season. Unfortunately there was no such 

 well-marked periodic deposition of eggs as characterized 19 15, and 

 consequently sharply defined variations in egg laying could not be 

 demonstrated. It is felt, however, that the data recorded below 

 make a substantial addition to the meteorology of New York State 

 orchards and may well be used as a basis for further investigations 

 which may enable us to state the conditions favorable for the deposi- 

 tion of large numbers of codling moth eggs. This matter is something 

 which may be of great practical importance in connection with the 

 destruction of young caterpillars before they have materially injured 

 the fruit. 



A comparison of the temperature records for the latter part of 

 June, the period when climatic conditions are most likely to affect 

 codling moth oviposition, shows an interesting discrepancy between 

 temperatures at Kendall near the lake and those in the relatively 

 nearby Albion orchard, approximately 10 miles south and west. 

 It will be noted that there was a marked rise in temperature begin- 

 ning June 24th, and on the 28th there was a difference of 14 degrees 

 between the temperatures recorded for 8 p. m. at Kendall and 

 Albion, the latter being higher and the difference ample to affect 

 materially the deposition of eggs, provided this is a factor of some 

 importance. It will further be noted that on comparing data from 

 other localities where observations were recorded, while this period 

 showed a distinct increase in the evening temperatures, the dif- 

 ference was not nearly so marked as between the two places men- 

 tioned above. This is very possibly to be explained in part at 

 least by the fact that the Albion orchard was more remote from the 

 lake and consequently less liable to be affected by the relatively 

 high evening temperatures occurring in sections somewhat distant 

 from a body of water. 



An examination of the data obtained at Kendall plainly indicates 

 the difficulty of approximating with a fair degree of accuracy evening 

 temperatures from minimum temperatures. The difference between 

 the two, as will be seen from this table, varies within considerable 

 limits and is materially modified by weather conditions, especially 

 by the presence of clouds. 



