. Birds of a Maryland farm : a local study of economic ornithology . \. Fig. 81.—Yellow-bellied sapsucker. In November, L900, 7 of the 9 tree- were dead and the others woreflying. A strip of hark- 7 inches long by 2 wide, where the sapsuckershad worked in L896, was torn oil and found to contain 84 drills, an aver-age of •) to the square inch. Many of them were so close together thatthe tissue between had broken down, leaving rents in the hark an inchor two long, and in some place- almost girdling the tree. The loss >fsap must have been an exhausting drain, bul it was not the sole causeof de
. Birds of a Maryland farm : a local study of economic ornithology . \. Fig. 81.—Yellow-bellied sapsucker. In November, L900, 7 of the 9 tree- were dead and the others woreflying. A strip of hark- 7 inches long by 2 wide, where the sapsuckershad worked in L896, was torn oil and found to contain 84 drills, an aver-age of •) to the square inch. Many of them were so close together thatthe tissue between had broken down, leaving rents in the hark an inchor two long, and in some place- almost girdling the tree. The loss >fsap must have been an exhausting drain, bul it was not the sole causeof death. Beetle- of the Hat-headed apple borer, attracted by the 90 BIRDS OF A MARYLAND FARM. exuding sap, hud oviposited in the holes, and the next generation,haying thus grained an entrance, had finished the deadly work begunby the sapsuckers. Holes made by birds are sometimes closed by burl-like knobs of wood, but if they remain open the death of thetree from borers La very likely to result. In the ease of the treeskilled at Marshall Hall, galleries made by borers
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirdsma, bookyear1902
