168 MASS. EXPERIMENT STATION BULLETIN 206. 



a distinctive appearance, with none of the marks of drowning injury. 

 Many of the buds on the upper bog (where the water was held for seventy- 

 two hours) showed drowTiing injury, but none looked like those hurt on 

 the other bogs. These bogs were examined again late in August, and the 

 lower ones (where the water was held forty-two hours) had little fruit, the 

 crop being plentiful only in low places and along the ditches. On the other 

 bog the crop was heaviest on the high parts. 



The buds on the lower bogs may have been hurt by exposure to the cold 

 when the water was let off, though no frost was seen in the vicinity that 

 night. The fact that the buds were hurt less in the low places, as evinced 

 by the heavier fruiting there, shows that the water tended to prevent the 

 injury. 



Blueberry Work. 



To control the gypsy moth, different parts of the blueberry plantation 

 were sprayed on June 3, 1919, with these mixtures: — 



1. Three pounds of lead arsenate powder to 50 gallons of water. 



2. Three pounds of lead arsenate powder and 2 pounds of Good's Caustic Potash 

 Fish-oil Soap No. 3 to 50 gallons of water. 



Both sprays killed the worms, but the one with soap burned the foliage 

 and blossom buds badly. 



No budding was done in 1919 because of a lack of good sprouts to bud 

 into, but in 1920 it was done as follows: — 



Pioneer (620A) variety, 82 buds. 

 Cabot (S34A) variety, 208 buds. 



Gypsy-moth caterpillars showed a special fondness for the growth from 

 inserted buds, giving so much trouble that it seemed impossible to continue 

 the work, until it was found that the caterpillars were stopped by tree 

 tanglefoot around the bases of the sprouts. 



Sixty-eight small Pioneer plants from the Bureau of Plant Industry 

 were added to the station planting, 2 in 1919 and 66 in the spring of 1920. 



The drainage of the plantation was improved by new construction in 

 1920. 



The plantation produced 98 quarts of berries in 1919, and 147 in 1920, 

 the bearing area being about a quarter of an acre. The fruit was sold 

 locally at moderate prices. Most of the bearing plants are untested 

 seedlings (four years old in 1920) provided by the Bureau of Plant In- 

 dustry. A few of these seem promising, — one in 1919 yielding over 2 

 quarts of berries which averaged about 15 mm. in diameter, the largest 

 measuring 18 mm. The largest berries from the plantation in 1920 were 

 20 mm. (about eight-tenths of an inch) through. 



The proper development of the blueberry work and of the cranberry 

 variety work requires several additional acres of rough land, and an early 

 approi)riation should be made for it. 



