10 BULLETIN 799, V. S. DEPARTMENT OF AGEICTJLTURE. 



This indicates a greater number of the older trees of the 121 to 

 160 age class on the Silver Creek sale area than on the Honeysuckle 

 area. Continuing the inspection of the data in the table it is seen 

 that the total volume of rot, the rot percentage, and the precentage 

 of infected trees for the combined rots are all greater in the case of 

 the Silver Creek area. The difference of 10 years between the average 

 age for the two areas is apparently responsible for the difference in 

 the rot activity just noted and gives further evidence that, the site 

 being similar, the age of the stand affects the amount and percentage 

 of rot as well as the number of trees infected. Eliminating the 

 difference in the average ages between the two sale areas, the slope 

 sites of the two areas should yield more nearly equal values for total 

 volume of rot, rot percentage, and percentage of infected trees. 



Another interesting point brought out in Table II is the variation 

 in the amount of butt-rot for the two areas. Very little butt-rot 

 is found upon the Silver Creek area (1.6 cubic feet) in comparison 

 to that found on the Honeysuckle area (96.1 cubic feet). 



In Table III comparisons are made between the rot percentages of 

 trees occurring on the slope and bottom sites of the same sale areas. 

 This method of comparison removes all possible variations which 

 might be due to comparisons of plats occurring upon widely separated 

 areas. In general, the figures show a higher rot percentage in trees 

 occurring on the bottom sites than in those growing on the slopes. 



On the Bennett-Miner sale area plat 1 was laid out upon the slopes 

 and plat 2 on the bottoms. The bottom sites have a greater average 

 by 38 years and also a greater rot percentage by 6 than the slope sites. 

 In comparing the slope and bottom sites of the Silver Creek plat 1 

 area it is seen that the difference in average age is only 4 years, 

 while the difference in rot percentage is approximately 5. Again, in 

 comparing the Honeysuckle plat 1 with the Honeysuckle plat 4 area 

 the difference in average age is 7 years and that of the rot percentage 

 4.5. The greatest difference in rot percentage is found in comparing 

 the Humbird area with the Tent Creek area, between which are found 

 differences of 39 years in average age and 7 per cent in the rot. This 

 last comparison is not as dependable as the ones preceding, since the 

 slope and bottom areas compared were taken from two widely sepa- 

 rated sale areas. Similar criticism also applies to the comparison 

 of the Honeysuckle plat 3 with the Silver Creek plat 2 area, which 

 comparison indicates the possibility that the difference in average 

 age may not be entirely responsible for the small rot percentage in 

 the Honeysuckle plat 3 area. Comparing the same Honeysuckle plat 

 3 area with the Honeysuckle plat la area it is seen that a difference 

 in rot percentage of 0.538 is more than balanced by a difference of 50 

 years, which latter is no doubt accountable for the larger rot percent- 

 age found on the slope sites. 



