The diseases and pests of the rubber tree . enter. As previously stated, the fungus develops freely on smallpieces of Jak wood, and it has been found to spread to Heveafrom decaying Jak stumps. In this respect it resemblesFomes lignosus, and provides an additional reason for theremoval of Jak stumps. It also occurs on felled Dadap logs,and has been found to cause root disease of Derris robusta, sothat it is probable that it may attack members of the orderLeguminosae in general. In the first case recorded the funguswas probably introduced with firewood, miscellaneousjungle timber. Dead tre
The diseases and pests of the rubber tree . enter. As previously stated, the fungus develops freely on smallpieces of Jak wood, and it has been found to spread to Heveafrom decaying Jak stumps. In this respect it resemblesFomes lignosus, and provides an additional reason for theremoval of Jak stumps. It also occurs on felled Dadap logs,and has been found to cause root disease of Derris robusta, sothat it is probable that it may attack members of the orderLeguminosae in general. In the first case recorded the funguswas probably introduced with firewood, miscellaneousjungle timber. Dead trees must be dug up and burnt, as much of theroots as possible being extracted, especially the neighbouring stump should also be dug out, and all piecesof wood collected and burnt. Small pieces of wood arequite sufficient to provide a suitable habitat for the affected area should be surrounded by a trench abouttwo feet deep, and the groimd dug over and dosed with lime,which should then be forked in. 70 THE RUBBER TREE. ElG. 11. details of the fungus. No. 1. A group of oonidiophores. x 2. No. 2. Tip of a hair from the stalk, x 350. No. 3. Conidiiferoua hypha from the apex of the oonidiophores. x 500. No. 4. Conidia. x 600. No. 5. Perithecia on an old oonidiophore. x 6. No. 6. Groups of perithecia on a horizontal rhizomorph. x 7. Bhizomorpns from dadap. No. 8. Cross section of a rhizomorph ; outline only, x 9. Cross section of the cortex of a rhizomorph, magnified. No. 10. .Cross section through the rhizome of arrowroot attacked by Sphaerostilbe;the dark lines are the sections of the rhizomorphs. ROOT DISEASES 71 EooT Disease op Stumps {Botryodiphdia Theobromae, Pat.) In several cases in Ceylon Hevea stumps which had beenplanted out under favourable conditions failed to the plants made no growth whatever, but occasion-ally some developed a green shoot about six inches long andthen died. They were usually sent in as examples of thed
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