Shortleaf pine : its economic importance and forest management . F-13222A Fiq. 1.—Encroachment of Shortleaf on Successively Abandoned Portions ofCotton Field. Stands of Six Different Ages. g^juagy. mKk ? - ^^^^^^M L •:«^ ;v : ||t mm¥<^.^-\ v^im WHmm *, . It; * v ? Jw- . F-20687A Fig. 2.—Very Dense Stand of 9-Year-Old Seedlings, 42,000 Trees Per Close Relation Between Density and Development. SHORTLEAF ENCROACHING UPON FIELDS UNDER CULTIVATION. Bui. 308, U. S. Dept. of Agriculture. Plate VIII. SHORTLEAF PINE: IMPORTANCE AND MANAGEMENT. 25 INSECTS. The southern pine beetle1 {Dendroc
Shortleaf pine : its economic importance and forest management . F-13222A Fiq. 1.—Encroachment of Shortleaf on Successively Abandoned Portions ofCotton Field. Stands of Six Different Ages. g^juagy. mKk ? - ^^^^^^M L •:«^ ;v : ||t mm¥<^.^-\ v^im WHmm *, . It; * v ? Jw- . F-20687A Fig. 2.—Very Dense Stand of 9-Year-Old Seedlings, 42,000 Trees Per Close Relation Between Density and Development. SHORTLEAF ENCROACHING UPON FIELDS UNDER CULTIVATION. Bui. 308, U. S. Dept. of Agriculture. Plate VIII. SHORTLEAF PINE: IMPORTANCE AND MANAGEMENT. 25 INSECTS. The southern pine beetle1 {Dendroctonus frontalis Zimm.) hasbeen the subject of exhaustive study by Dr. A. D. Hopkins, in WestVirginia between 1891 and 1901 and in the Southern States from1902 to the present time. According to these investigations this insecthas caused the death of millions of shortleaf and loblolly trees andsome longleaf. The loss during the past 20 years due to this in-sect has been estimated at between 10 and 20 million dollars. From1890 to 1893 a serious invasion occurred in Virginia and West Vir-ginia. In the season of 1910 the trouble occurred in many placesin the Southern States, leading to a special study and demonstrationof methods of control by the Bureau of Entomology and the publica-tion of Farmers Bulletin 476, from which the recommendations forcontrolling the insect pest are quoted below because of their value andimportance to owners of shortleaf stands. It is important, however,that all of Farmers B
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