Enhancement of sphaeropsis canker of aleppo pine by the Israeli pine bast scale |
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| Authors: | Z Madar Z Solel M Kimchi |
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| Institution: | (1) Forest Department, Keren Kayemet LeIsrael, 26103 Qiryat Hayyim, Israel;(2) Dept. of Plant Pathology, ARO, The Volcani Center, 50250 Bet Dagan, Israel |
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| Abstract: | An interaction between the fungal pathogenSphaeropsis sapinea (Fr.) Dyko & Sutton, causal organism of Sphaeropsis canker, and the Israeli pine bast scaleMatsucoccus josephi (Homoptera: Margarodidae), causal agent of pine decline, was studied, since both were prevalent on Aleppo pine (Pinus halepensis) stands.Sphaeropsis sapinea was isolated from larvae (stage II) and molts of the Israeli pine bast scale collected in four Aleppo pine stands. When Aleppo
pine saplings were infested with pine bast scale and subsequently inoculated withS. sapinea most plants died, whereas mortality of seedlings inoculated withS. sapinea alone without previous scale infestation was negligible. Scale infestation of saplings without subsequent fungal inoculation
caused the death of one third of the plants. Wounding of pine shoot apices by removal of needle fascicles enhanced infection
byS. sapinea. The results support the assumption thatM. josephi can play an important role in transmitting the fungal inoculum to the host tree as well as enabling its penetration to the
shoots through wounds in the bark.
http://www.phytoparasitica.org posting Dec. 20, 2004. |
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| Keywords: | Sphaeropsis sapinea Matsucoccus josephi Pinus halepensis P pinea P canariensis infection wounding |
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