. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 24 BULLETIN 1225, U. S. DEPARTMENT OF AGRICULTURE. plior thrips. Without a single exception all trees cut near the ground sent up snoots from the crown, and in no instance did these shoots originate near the cut end of the stump. It is the nature of the trees to sprout from the crown instead of from any other place on the body of the tree. After a year or more these sprouts became rather large and vigorous and showed practically no damage from thrips. (PI. VI, B; fig. 7.) The camphor trees on a 60-acre tract at Satsuma
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 24 BULLETIN 1225, U. S. DEPARTMENT OF AGRICULTURE. plior thrips. Without a single exception all trees cut near the ground sent up snoots from the crown, and in no instance did these shoots originate near the cut end of the stump. It is the nature of the trees to sprout from the crown instead of from any other place on the body of the tree. After a year or more these sprouts became rather large and vigorous and showed practically no damage from thrips. (PI. VI, B; fig. 7.) The camphor trees on a 60-acre tract at Satsuma were cut off at the level of the ground in November. The tops were not removed imme- diately, however, but were allowed to remain a few days after being cut down. This probably permitted some of the insects to reinfest the field. Neither were all of the small shoots growing near the base of the trees cut off, and they furnished a food supply for such insects as escaped from the cut tops. The work, however, was done on a. Fig. 7.—A field of camphor trees three months after being cut off at level of ground. The new growth originates at the crown and grows rapidly. good commercial basis and no doubt was carried on as efficiently as could be expected. Repeated visits to this field showed that every tree sent forth sprouts from the crown and about a year afterward these were from 5 to 7 feet high. To be sure, some injury from thrips was noticed, but the damage was very slight. The greatest injury was on those trees located nearest the old unpruned trees across the road. The stumps were not treated with any material to prevent wood decay or kill thrips. Pruning experiments were also conducted in a 10-acre field which had three sides not bordered by camphor trees. The trees in this field, also, were cut down at the level of the ground and all tops removed at once. All small shoots growing near the base of the stump were likewise carefully destroyed. In so far as was possible all so
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