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but they were on the whole strong and vigorous plants. The 
wilt was accompanied by a symptom of the carnation and cashew 
nut disease, viz., the softening of the area of stem immediately 
below ground level. The tap-root was firm while some of the 
smaller roots were decayed. Hyphae were found in the root 
tissues as formerly, but neither conidia nor chlamydospores 
were seen. Pure cultures of the Fusarium were prepared from 
damp-chamber and tissue-fragment material. The lack of colour 
and of a large aerial mycelium in the cultures and the rapid 
development of the oily streaks and of conidia were striking. 
The aerial mycelium was small in amount and almost colourless, 
while three-septate macroconidia were very numerous in three 
days, as in the case of the cashew nut strain of the Fusarium 
grown on rice agar. Later, five-septate conidia were found in 
great numbers, and a three-septate sturdy spore resembling that 
found in the case of Spondias lutea inoculated with the cashew 
nut Fusarium was also common. 
FURTHER CROSS-INOCULATION EXPERIMENTS. 
Further experiments were conducted with seedlings of silky 
oak, rose apple and loquat. All were healthy potted plants 
and were kept entirely out-of-doors. Each host was inoculated 
with the Fusarium from Grevillea, loquat and cashew nut. 
A suspension of tested conidia in sterile distilled water was used 
and all the plants were wounded in the larger roots before 
inoculation. There were three sets of each host plant and the 
necessary controls. 
Positive results were obtained only in the case of the Grevillea 
plants, and all the rose apple and loquat seedlings remained 
perfectly healthy and continued their growth. The Grevillea 
plants proved susceptible to all three strains of the Fusarium 
used in inoculation, and the fungus was recovered from the dead 
plants with typical mycelium and conidia. The results seemed 
to confirm what has been apparent with regard to the degree of 
susceptibility of the various hosts, viz., that it varied with the 
host plant concerned, Grevillea being the most susceptible. It is 
to be noted that even the cashew nut strain with the help of 
a wound-entrance into the tissues did not prove harmful to the 
rose apple and loquat hosts and that these plants could be classed 
with the mango as regards power of resistance to the Fusarium. 
If a scale of susceptibility were to be drawn up, the cashew nut 
would occupy a high place in it, the loquat and rose apple allow- 
one, and the silky oak an intermediate position. 
THE FUSARIUM ASSOCIATED WITH HETERODERA RADICICOLA, 
GREEF. 
The afore-mentioned occurrences of the Fusarium were all 
from one area. Its association with the well-known eelworm, 
Heterodera radicicola, occurred on several Antirrhinum and 
_earnation plants growing in a bed and in tubs of soil in a private 
