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Production germination and dispersal of basidio spores of ganoderma pseudoferreum on hevea



Production germination and dispersal of basidio spores of ganoderma pseudoferreum on hevea



Journal of the Rubber Research Institute of Malaysia 25(2): 93-100



Induction of continuous fructification and basidiospore production of G. pseudoferreum [red root disease pathogen] was achieved in vitro by incubating diseased rubber stumps in well-shaded and moist shed covered with woven palm fronds. This technique facilitated close observation of the developing fruit bodies and their associated fauna, besides ensuring a constant supply of fresh spores for use in laboratory insect feeding and spore germination studies. Basidiospores of G. pseudoferreum were shown to be viable for the 1st time; germination of the spores occurred in distilled water following ingestion and passage through the gut of larvae of 2 spp. of the Tipulid fly Limonia, a normal constituent of the microfauna of the fruit bodies. In laboratory feeding experiments the larvae thrived on a diet consisting solely of basidiospores of G. pseudoferreum; the adult fly fed satisfactorily on an extract of fresh rubber wood. Basidiospores activated by passage through the larval gut remained viable for up to 20 wk, their germination rate being highest in fresh rubber wood extract, but were adversely affected by exposure to temperatures above 40.degree. C, dessication or solar radiation. Field observations of the biology of the fly in Hevea plantations suggest that while its larval stage is well-adapted for bringing about the biological stimulation required in the germination of basidiospores of G. pseudoferreum, the winged adult fly acts as an effective carrier in the distal dissemination of the viable spores.

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