162 EXPERIMENT STATION RECORD. [Vol. 40 



out soap, gave a very slight amount of burning on the rose, but when used with 

 soap no burning was noticeable. 



Lime-sulphur used against the tomato psyllid (Paratrioza cockereUi), which 

 often becomes of economic importance in tomato fields and gardens of the State, 

 destroyed 80 per cent of the psyllids when used at the rate of 1 : 33. The 

 strengths of 1 : 40 and 1 : 45 seemed to have been almost if not quite as effective 

 as 1:33 without so much apparent injury to the plants, although the growth 

 was checked for a short time. The lime-sulphur then seemed to act as a stimu- 

 lant, as the plants grew rapidly, even more rapidly than chocks which hail few 

 psyllids on them. Nicotin sulphate used against the tomato psyllid at the rate 

 of 1 : 200 gave negative results. 



In tests of a number of miscible or soluble oils for the destruction of the fruit- 

 tree leaf roller there was a great variation in the results obtained, some giving 

 excellent results with all strengths, while others gave very poor results even 

 with the higher strengths. Hydrocyanic acid gas had very little, if any. oflVct 

 upon hatching of the leaf-roller eggs, while carbon blsulphid gave bettor hut 

 unsatisfactory results. Hot water need at the rate of 140° F. or higher was 

 very effective in the destruction of the fruit-tree leaf-roller eggs. 



Entomology (Xac ■/< r.scii Stns. Bill. 517 (1917), pp. 85-40).— This is a brief 

 statement of the work of the year. 



In the course of control work with orchard Insects it was found that 85 per 

 cent of the apple plant lice were destroyed during the dormant season by coating 

 the eggs with winter-strength lime-sulphur, and that ah. mi 98 per cenl were 

 killed when they were wetted with a 2 per rent aqueous solution of crude car- 

 bolic acid to which enough soap had been added to break the surface tension. 



The efficiency of lime-sulphur appears to be Increased by the addition of 40 per 



rem nleotin at the rate of 1 : 500. The miscible oils gave less satisfactory re- 

 sults. Scalecide, which contains no phenol, killing about 45 per cent, while 

 Mechllng'S scale Oil, which contains considerable phenol, killed about 85 per 



cent. 



Control work with the pear psylla Indicates that winter treatments may be 

 omitted, but thai W per cent nleotin should be added to the winter-strength 

 lime-SUlphur I 1 : 500), winch is applied just before the blossoms open, and that 

 the treatment must be very thorough. Studies of the control of the peach 

 borer show that poisoning the adults will not effect a control, since as many 

 as 500 eggs may he laid before food is taken, and that control by destruction 

 of the eggs involves a treatment every '.) or 10 days, beginning July 15. 



Thirty-second report of the State entomologist, 1916, E. P. I'i i i i \ V. 

 State Mu*. Bui. 198 {1917), pp. 216. pis. S, figs. 5!,).— Following a brief pre- 

 liminary account the experimental work with the codling moth, carried on in 

 continuation of that previously noted (E. S. R., 36. p. 855). at Kendall. Albion. 

 Hilton, and Newfane is reported upon. The codling-moth work in western 

 New York emphasizes the necessity for thorough application, particularly of the 

 first or calyx spray, which is applied just after the blossoms fall, and is the 

 spray which gives by far the larger returns in preventing wormy applies. The 

 second application may be effective in reducing "side Injury" to some extent 

 (E. S. R., 37, p. 259). Roth the second and third sprayings, even if they have 

 comparatively little intluence in reducing the numbers of this peat, are con- 

 sidered abundantly Justified in localities during seasons when scab is more or 

 less prevalent. "A comparison of results obtained in the Kendall orchard In 

 1915 and upon the same trees in 1918 shows a reduction of one-third to two- 

 thirds in the amount of wormy fruit and is striking evidence of the efficiency 

 of thorough spraying and the results which may be expected the following 

 season." 



