143 
ago a very fine Brownea 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 know-n. It may be useful 
here to give a list of all pests recorded tp the plant according to the 
parts they attack : 
Roots. 
Fomes Semitostus 
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 brunneum 
G. Heveae 
Collet otrichum Heveae 
Phyttachora sp. 
Phyllosticta Heveae 
Fusicladium 
Animals 
Termes Gestroi 
Pterolophia melanura (Longicorn beetle) 
Xyleborus parvulus (shot borer) 
Eumeces squamosus (Beetle, eats the leaves) 
Brachytrupes Achatinus (Cricket) 
Acarl (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. 
