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南京老山林场火炬松、湿地松种源试验林在１０ａ生时（１９９１年）开始感染松枯梢病和松针褐斑病，病情日趋严重，在１３ａ生（１９９４年）和１５ａ生（１９９６年）时两次重复测定感病和生长变异，火炬松不同种源感病和生长变异均极显著，两者间及年度间相关极显著。按照选择指数的大小选出抗病、生长优良种源４个即９号（佛罗里达·纳索），１０号（路易斯安那·利文斯通），１２号（阿拉巴马·埃尔卡拉）和１９号（佐治亚·爱克特），其选择指数比平均值大２１．４３％～４８．１０％，感病指数低３３．７１％～４９．５３％，树高大７．３２％～１３．５２％，胸径大７．５０％～１７．１９％。同时选出两年重复测定均优良的单株４０多株（占总株数６．７％左右，其中优良种源占５０％），其感病级别０～Ⅰ级，生长量比平均值大１０％以上。湿地松种源间感病变异不显著，生长虽然有一定变异，但两者相关不显著。选择主要在个体间进行。已选出并经两年重复测定均优良的单株２０多株（占总株数３．３％左右），其感病级别为０～Ⅰ级，生长量比平均值大１０％以上。
In Laoshan Forest Farm in Nanjing, the provenances of Pinus elliottii and Pinus elliottii plantations began to be infected with pine shoots and pine needle brown spots at the age of 10a (1991) and their condition became more and more serious. In the period of 13A (1994) and 15a (1996) ), The susceptible and growth variations were determined twice. The susceptible and growth variations of Pinus taeda in different provenances were extremely significant with significant correlations between the two and the year. According to the size of the selection index, 4 disease-resistant and high-growth provenances were selected, namely No. 9 (Florida Nasco), No. 10 (Louisiana Livingstone), No. 12 (Alabama El Cala) and 19 (Georgia · Electoral), the selection index than the average of 21.43% ~ 48.10%, low susceptibility index 33.71% ~ 49.53%, tree height 7.32% ~ 13. 52%, breast diameter 7.50% ~ 17.19%. At the same time, more than 40 plants (accounting for about 6.7% of the total number of excellent plants and 50% of them) with excellent reproducibility in two years were selected. Their susceptible grades ranged from 0 to 1 and their growth was 10% %the above. Slash pine provenance variation is not significant, although the growth of a certain variation, but the correlation between the two was not significant. The choice is mainly between individuals. More than 20 strains of plants that have been selected and have been repeatedly tested for two years (accounting for about 3.3% of the total number of plants) have a susceptible grade of 0 to 1 and their growth is over 10% larger than the average.