REPORT OF THE STATE ENTOMOLOGIST UjOCj 



S3 



A study of the condition of the wormy fruit gives some in- 

 teresting data as to the point of attack, though very little can 

 be gleaned therefrom in favor of using a coarse spray with a 

 heav}' pressure, as compared with a finer spray and more mod- 

 erate power. It will be seen by reference to the table above, 

 that on plots i to 3, 10 to 18.36^^ of all the wormy apples 

 were entered at the end, an average of 14;^ end wormy. Simi- 

 larly, in the case of plots 4 to 6, the variation is from 9.94;^ to 

 12.50^ or an average of 11.50^ of end wormy apples in the total 

 infested. Compare these percentages with the 69.37;/ end wormy 

 of the infested apples on the two check trees. It will be seen 

 at once that the major portion of the codling moth larvae de- 

 stroyed, must ha\e been killed in or about the blossom end be- 

 cause of the enormous reduction in the number of end wormy 

 apples. A comparison between the percentages of the wormy 

 apples entered at the end in plots i to 3 with those of 

 plots 4 to 6, reveals, so far as this factor is concerned, a 

 slight gain in favor of the coarse, heavy spray of the Bordeaux 

 nozzle. On the other hand, comparisons between the totals for 

 plots I to 3 and 4 to 6 respectively, show that the first produced 

 50,173 apples of which 98.87,^ were free from infestation, while 

 the latter yielded 47,298 apples and had gS.Si^( of worm-free 

 fruit, a difiference of only .06 of i^c in favor of the finer spray. A 

 comparison of the totals of the wormy fruit between these two 

 series of plots given in the above table shows an equally close 

 parallelism. 



Experiments i and 4 were duplicated in the orchard of Ed- 

 ward \'an Alstyne at Kinderhook, N. Y., the plots being located 

 as shown on plate. 4. In addition, a third plot designated as 7. 

 was sprayed for the purpose of testing the results to be ob- 

 tained from a still higher pressure, and an attempt was made 

 to keep the gage up to 200 pounds. Plot 4, located near the 

 barn, consisted of Greenings; plots i and 7 were Baldwins, the 

 latter being seven rows north of the barn, on a knoll and a 

 little to the east of the other plots, while the two check trees 

 lay near the northern boundary of plot i. Spraying began May 

 29. The weather was cloudy, threatening and with a little wind. 

 There was a heavy shower from i to about 1.30 p. m. and atK^thor 

 at 2 p. m. resulting in a cessation of operations. 



The spraying May 29 was with the old type of iM-iond nozzle, 

 which is considerably deeper than the latter make. Tlic i)rcssure 



