122 
First Distinct Signs : 
Treatment, Spore. of Infecti es Result, 
2. Spores digested} Pycnospore | On 1 shoot after 14 a infection of 1 shoot. 
in artificial gas- days. No cnidial formation. 
tric juice for 12 Feeble mycelium in shoot 
; the deter 
washed in sterile randulae. 
water and brush-| Hyaline 
ed on the surface) —— None after 30 days ...| None. 
of 12 shoots. 
oan: On 5 shoots in 12 days| Pycnidial formation on 
On 1 shoot in 18 days} shoots after about 40 aie 
ycelium in 2 remaining 
shoots identified as Phoma 
Chlamydo- avandulae. 
spore.| On 7 shoots in 11-12) Pycnidial formation on 6 
days. shoots after ees fie 
Mycelium ining 
oth identified « as y Phan 
larandu 
3. Suspension of — None after 30 days ...| None. 
e 
spores in s 
water frozen for} Conidium.| N " 
aboutl4minutes,| Brown one after 30 days ...| None. 
sad seinciian’: Conidium.| On 7 shoots in 14 days} Pycnidial formation on 3 
t! as ap shoots after about 40 days. 
tee On 1 shoot after about 60 
Chlamydo- | On 8 shoots in 12-14! Very sparin cnidial form 
Spore.| da ibe 0s rplih ts after about 
On I shoot in 17 days| 40-43 ron Se Mycelium in 
3 remaining shoots identi- 
a fied as Pinar lavandulae. 
No definite controls were kept, but all the inoculated plants 
were either amongst others in a bed or had other plants in their 
immediate vicinity. The disease only appeared on those et 
‘here no pyenidial formation occur? 
the infected shoots were carefully iéetioned and the mycelium 
resent ¢ 
2 i ey teenton with mycelium definitely known to 
Similar infection e; 
spica with g eproximately equal cenilts Infection experiments 
PY peatian only on Lavandula vera and Lavan 
Kise 5 cnidial formation obtained in both cases. 
| pts were aks to infect the following plants: Chrys 
ee inca sp., Artemisia sp., San tolina 
@ 8p., Aster sp., Malva sp., dle | ee sp. 
he t triais were 
made with directl 
fone from lavender shoots, and thine wees. plas ar bo th on the 
Subsequ ai Siiaody wounded tissues. No infections occurred. 
i the Si - sus was transferred to a mush made My 
the a Merecd plant 2 ly Sterilised and mie sige! i 10s 
