226 Missouri Agr. Exp. Sta. Research Bulletin No. 8 



Variety 



Elberta peach twigs. 



Rice's Seedling 

 peach twigs . . 



Late Duchess 



apple twigs 



Jonathan apple twigs. 



Jonathan apple twigs. 



Young apple twigs, 

 variety not given . . 



Young apple twigs, 

 variety not given. 



Jonathan apple twigs 

 and wood from 

 three-year old Jon- 

 athan tree 



Jonathan apple stems 

 from }s in. to 1 in. 

 in diameter 



Dyehouse cherry 



young and old wood 

 Cherry twigs 



Date 



Tem- 

 pera- 

 ture 



Mar. 23,'13 



July 15,'13 

 July 16,'13 



July 16,'13 



July 27, '12 



July 28,'13 



-18 



Mar. 23, '13! -18 



-6 



-5 



-5 



July 27,'12; -5 



-5 



Aug. 15, "12 -5 



July 28,'13 -5 

 Aug. 13, '12' -6 



Results 



100 buds, 88% killed. Injury to 



wood confined in all cases to sap 



wood and pith. 

 138 buds, 44.2% killed. Injury to 



wood confined in all cases to sap 



wood and pith. Injury less than 



to Elberta. 

 20 buds, 70% killed. 4 twigs, no 



injury. 

 29 buds, 86.2% killed. 9 twigs, no 



injury. 



24 buds, 58.3% killed. 11 twigs, 

 no injury. 



12 buds, 100% killed. Cortex 

 browned in places, especially 

 around the buds. Cambium dead 

 in region of annual ring and ter- 

 minal of year's growth. Pith dead 

 in region of annual ring. 



Leaves practically all injured. Bark 

 killed about 7 in. back from ter- 

 minal. Cambium killed about 7 

 in. back from terminal. Sap wood 

 killed 5 to 6 in. back from termin- 

 al. Pith killed 4 to 5 in. back 

 from terminal. 



44 buds, 70% dead. Roots, cam- 

 bium and cortex injured through- 

 out. Wood, sections just above 

 ground and 3 feet above dead in 

 cambium and cortex. This year's 

 growth injured in cambium and 

 cortex in older parts, and all tis- 

 sue dead at tips. 



Cortex and cambium injured slight- 

 ly in all samples. Sap wood and 

 pith not injured. No marked 

 difference between the different 

 diameters. 



40 buds, 100% killed. 



25 out of 36 buds killed. Some 

 buds at base of new twigs and on 

 spurs on old wood alive. Leaves 

 all partially injured; only 25% 

 entirely killed. Youngest wood 

 injured worst. Slight injury in 

 cambium and cortex. No injury 

 to sap wood ol two year twigs or 

 older. 



By referring to this table and to Tables 22, 23 and 24, it will 

 be seen that the fruit buds are in all seasons apparently less hardy 

 than any other tissue, except the pith and the tissue at the base of 

 the buds, and in early winter the wood at the surface of the soil. 



