title: [Causal factors of decline disease in exotic pine (Pinus taeda and P. elliottii) plantations].
abstract: Investigation on the cause of the decline of exotic pine plantations in Anhui Province was carried out from 1995 to 2000. The results showed that the cause might develop from the interaction of three or more sets of factors. The first group of factors called as predisposing factors were high and low temperature and rainfall, poor soil fertility, and excessive soil bulk density, soil moisture, and of stand density; the second group of factors called as inciting factors were insect defoliators, damaging diseases of needles, late spring frost, severe drought, and excessive resin-tapping, and the third group of factors called as contributing factors were several biotic agents such as shoot blight infected by Sphaeropsis sapinea, decay wood and root rot by fungi, and bark beetles and wood borers.
authors.affiliation: Anhui Agricultural University, Hefei 230036. qinglongshu@21cn.com
authors.forename: Q
authors.initials: Q
authors.lastname: Shu
authors.forename: G
authors.initials: G
authors.lastname: Yang
authors.forename: Y
authors.initials: Y
authors.lastname: Zou
authors.forename: J
authors.initials: J
authors.lastname: Tang
authors.forename: C
authors.initials: C
authors.lastname: Huang
mesh_terms: D015984:Causality; D002980:Climate; D004777:Environment; D028223:Pinus / Q000502:physiology*; D041603:Pinus taeda; D010935:Plant Diseases / Q000209:etiology*; D011891:Rain