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ago a very fine Browtiea grandiceps in the Botanic Gardens quite 

 suddenly showed a branch completely dead, leaves and all. Investi- 

 gation showed that the whole of the trunk and many of the branches 

 swarmed with millions of shot-borers, larvae and adults. The tree had 

 shown no signs of sickness previously. The bark was thickly painted 

 with soft soap and kerosine emulsion and then tarred. Immense num- 

 bers of the beetles came out of the bark in a dying condition, and the 

 larvae were found to be dying in these burrows, but all was in vain, 

 in a few days the tree was completely destroyed. No other trees 

 were attacked and I never saw a similar case in any other tree. 



To return to the direct damage caused by Corticium, M. Vernet 

 notes that it developes especially in overcrowded estates. Thus in 

 one estate he visited where the trees were 3 metres (9 feet, 9 inches) 

 apart, Corticium had done much damage, while in a neighbouring 

 estate where they were 6 metres apart the Corticium was scarce. 



M. Vernet gives a short discussion on the Diplodia and a list of 

 the remaining pests of the rubber tree as known. It may be useful 

 here to give a list of all pests recorded to the plant according to the 

 parts they attack : 



Roots. 



Fomes Semitostiis 

 Poria vincta 

 Irpex flava 

 Hymenochoete noxia 

 Stems and branches 

 Corticium Javanicum 

 Diplodia rapax 

 Nectria diversispora 

 Eutypa caulivora 

 Stilbella Heveae. 

 Leaves 



Pestalozzia palmarum 



P. Guepinii 



Helminthosporium Heveae 

 Gloueosporium hrumieum 



G. Heveae 



Collet otrichum Heveae 

 Phyllachora sp. 

 Phyllosttcta Heveae 

 Fusicladium 

 Animals 

 Termes Gestroi 



Pterolophia tnelanura (Longicorn beetle). 



Xyleborus parvidus (shot borer) 



Eumeces squamosus (Beetle, eats the leaves) 



Brachytrupes Achatinus (Cricket) 



Acari (attack leaves of young plants) 



Coccidae several species 



Slugs 



This may seem a formidable list but it is really small compared 

 with the pests which attack most other cultivated plants. — Ed. 



