Winter Meeting. 157 



killed, either by the treatment or as a result of the large wounds made 

 by removing galls. 



Copperas and Lime used as a wash on the wounds killed all the trees. 



Sulphur and Lime used as a wash on the wounds also killed all the 

 trees treated. 



Roots of trees dipped in zmter of a temperature of 140 degrees 

 F. for one minute were killed. In water of temperature of from 100 to 

 129 degrees F., about half of the trees were killed, but no galls were 

 formed. 



Treatment of trees while growing in the nursery resulted as 

 follows. The soil was scraped away and the remedies applied to 

 the galls: . 



Bhiestone solution of different strengths — ^ to i pint to a tree — did 

 not injure either trees or galls. 



Copperas solution used as above, caused slight injury to the roots 

 and also to the galls. 



Common salt y2 to 5 ounces per tree, killed all trees. 



Dry, air slacked lime from 2 to 8 ounces per tree, injured both the 

 galls and roots. 



Dry sulphur, i to 4 ounces per tree, gave no beneficial results inas- 

 much as it injured the roots wherever it did the galls. 



Formalin in strengths of from 2 to 20 per cent, and in quantities 

 of one-half to one pint per tree, killed all trees treated. 



INOCULATION EXPERIMENTS. 



Galls are found on the apple, red and blackcap raspberries in 

 Missouri and on the peach in some other states. The peach galls 

 used were obtained from Ohio. 



It was desired to learn something of the contagious nature of 

 the different galls and whether those on one species of plant would 

 grow upon another. The different plants, apple, peach and rasp- 

 berries, were grown in pots— some in sterilized soil and some not, 

 and kept on beds of clean sand so that there were no chances foi 

 outside infection. Minced galls from one species were placed in 

 contact with the roots of all the other species. The results of these 

 inoculations are given below: 



Apple trees inoculated with apple galls, 30 per cent, were affected. 



Apple trees inoculated with raspberry galls, 16 2-3 per cent, were affected. 



Apple trees inoculated with peach galls, 22 per cent, were affected. 



Peach trees inoculated with apple galls, none were affected. 



Peach trees inoculated with raspberry galls, 37 per cent, were affected. 



Peach trees inoculated with peach galls, none were affected. 



