18 EXPERIMENT STATION. [Jan. 



the jiartly grown berries and adhered to it much better than did any 

 arsenical with water alone. In this mixture, I'aris green seemed to 

 give better results than arsenate of lead. Best results were obtained 

 by s]jraying twice with an interval of at most only a few days between 

 the two applications, the first application thus acting as a basis for 

 putting a thicker coating of jwison on the fruit Uian would be pos- 

 sible with one spraying alone. This spraying was done about July 20 

 on berries of a late variety on a strictly dry bog {i.e., no winter 

 flowage). The fruit at this time varied greatly in size, the largest ber- 

 ries being nearly half grown. On some ])lois the fruit worm injury was 

 reduced as much as GO per cent. 



The Fire Worm {Eudemis vacciniana (Pack.)). 



The work with this insect consisted entirely of spraying experi- 

 ments. In the si)ring, arsenicals alone and in combination with Bor- 

 deaux mixture and resin fish-oil soap were tested as insecticides for 

 the larva). It became evident that an insecticide of good sticking 

 properties was needed for this purpose as the new foliage of the 

 cranberry is smooth and glossy and holds the water sprays very poorly. 

 Furthermore, this new growth develops rapidly during the time of the 

 hatching of the first brood, and sometimes this hatching period is 

 strung out for fully a month. The experiments indicated that a com- 

 bination of Bordeaux mixture, Paris green and resin fish-oil soap, 

 like the one given above for the fruit worm, would be most effective 

 for this insect also. One test with this combination showed about 

 three-fifths as much arsenic present on the foliage, after an all day's 

 rain followed by a complete ten-hour flooding, as was present when 

 the si)ray was first applied. The material for this combination is 

 about as cheap as the arsenate of lead capable of doing the same 

 work. The work connected with its prej^aration, however, is consid- 

 erable. 



Late in the fall, the value of sealecide and commercial lime-sulfur, 

 as insecticides for destroying the eggs of this insect, was tested. 

 Several plots were sprayed with different strengths of each of the 

 two insecticides mentioned. On some plots a plank drag was used 

 in advance of the spraying to turn the vines over, in order better 

 to allow the spray to reach the lower surfaces of the leaves (on which 

 the eggs are usually laid). The results of tliis spi'aying were observed 

 early in June, 1011. Though many eggs hatched on all the plots, 

 it was evident that on those treated with sealecide, a large percentage 

 had been destroyed. However, on all plots on which many of tiie 

 eggs were killed by the treatment, a large percentage of the Avinter 

 buds were destroyed also. The fire worm injury appeared to be con- 

 siderably worse on the plots which had been sprayed with the lime- 

 sulfur tlian on unsprayed ]ior(ions of llie bog, though the reason for 

 this was not apjiarent. This method of treatment docs not appear 

 promising. 



