Tutkimuksia kaasutuhoista Imatran valtionpuistossa

Kangas, E.

doi:10.14214/sf.a9020

Cited by 2 publications

(4 citation statements)

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“…In conclusion, our present and our previous studies (PAPPINEN and voN WEISSENBERG 1994a,b) lend support to KANGAS' (1934KANGAS' ( , 1938…”

Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 91%

“…Similarly, KANGAS (1932) found that the broods of the pine top weevil in Scots pine are more successful if the trees are weakened by air-borne pollutants or by the resin top disease. However, adult weevils do not need weakened trees for feeding (KANGAS 1934;SAAEAS 1949) because they can utilize healthy and vigorous trees. Interactions between bark beetles and pathogens are well documented but data on interactions between fungi and weevils that do not need weakened trees for feeding have not, to our knowledge, been published.…”

Section: Introductionmentioning

confidence: 91%

“…The pine top weevil Pissodes piniphilus Herbst (Col: Curculionidae) occurs very often on trees infected with the resin top disease caused by Endocronartium pint (Pers.) Y. Hiratsuka (KANGAS 1932(KANGAS , 1934. The edges of the cankers are good breeding sites for the weevil (PAPPINEN and VON WEISSENBERG 1994a).…”

Section: Introductionmentioning

confidence: 99%

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Weevil feeding on Scots pine affects germination of Endocronartium pini

Pappinen

Weissenberg

1996

European Journal of Forest Pathology

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Summary The aim of this study was to assess the effect and importance of the feeding of the pine top weevil (Pissodes piniphilus) on the germination of Endocronartium pini (syn. Peridermium pini) in Scots pine (Pinus sylvestris), and thus to establish the possibility of the E. pini infection via insect woundings. Germination tests were therefore carried out on current and previous year needle and phloem extracts. Elucidation of the importance of pathogen infection for the insect's feeding preference was also required; for this purpose feeding preference tests were carried out with healthy and infected pine branches using the pine top weevil as a test insect. Weevil feeding increased the germination of E. pini aeciospores on pine extracts. Germination on previous year annual‐shoot extracts was lower than that on current year annual‐shoot extracts. The advance of the growing season increased this trend, but weevil feeding increased germination on extracts from older annual shoots to the levels found on extracts from current annual shoots. Spores germinated equally well on needle extracts and on phloem extracts. The weevils ate more often on infected branches than on healthy branches. E. pini infections may occur via woundings on branches and weevil feeding may facilitate this.

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“…In conclusion, our present and our previous studies (PAPPINEN and voN WEISSENBERG 1994a,b) lend support to KANGAS' (1934KANGAS' ( , 1938…”

Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 91%