September, 1955 ForsBERG: FUSARIUM DISEASE OF GLADIOLUS 459 
Mraeitors cn. 0) soe % Cottony oP eee ae O01 
eer. to 4 Gin) 28. 4. Vallows) 373001 ee aoe 002 
Siig Bec) a ae Seviceous”. i" 2 Fhe sok eS 
Changes in medium color Bakted <7 eee ee 004 
renAnee. Roe ee 0 Submerged, cottony center. .005 
SLL a eee a Submerged, sericeous center  .006 
Strong decolorization ..... Bu Submerged, with cottony 
Color intensified in mycelium 3 fringe at edge, atoll.... 007 
Edge of colony Woolly cota thatie eee 008 
oh SOS Mig te ae ena 00 In the key to the species of Fusarium as 
od LES Ss De oo O1 arranged by Coons & Strong (1931), F. 
SECS ne 02 orthoceras and F. oxysporum are recorded 
Growth form of mycelium as being moderately sensitive to malachite 
Brpmerced 6 ee. OOO green, i.e., growth usually 1-2 centime- 
Table 3.—Reactions* of isolates of the gladiolus Fusarium to four concentrations of mala- 
chite green in Coons’s agar. 
CoNCENTRATION OF DyE 
ISOLATE 
1:66,666 1:100,000 1:200,000. 1:400,000 Control 
PERM ere SS ace int 0) tr 11.001 12.001 15.001 
PERU re atte ee oe cet tr tr 11.001 12.001 15.007 
niece? Se re 0 tr 11.001 13.001 15.000 
wholf, 2. DUOC eee 0 tr 11.001 12.001 15.000 
GG) Sox eRe Be RRRG 2 paren eae 0) tr 11.001 12.001 15.007 
pc TEU C8 as ae ee 0 tr 11.001 12.001 15.000 
Ly) SB OR ses ee 0 tr 12.001 12.001 15.001 
SLVSIIG) So te Se Ares ne ee 0) 0 tr 12.001 15.000 
AMAL 0 3 iid a tr 11.001 12.001 14.003 15.007 
Do Gi es eS 0 0 tr 12.001 15.007 
LULU OO 2 ee A ie ea tr 11.001 12.001 15.001 15.004 
HOR 2 Ee ee tr 0 tr 12.014 15.007 
SEU. SS a ee 0 tr 11.001 12.004 15.000 
SOGioigd 2 6Rs BS ae 0 tr 11.001 13.001 15.001 
SSUES Ve ne, oe tr 11.001 12.001 13.001 15.000 
SOG) 5 ee tr tr 11.001 12.001 15.007 
SADE DARE Ss So aaa eee ee 0 tr 11.001 12.001 15.007 
AUSSIE, ola ele SRO ee Mee eee 0 0) 11.001 13.001 15.001 
BST oe 2 ees OT eee 0 tr 11.014 13.004 15.005 
US ek Eee are a 0 tr 11.001 13.001 15.001 
ES MG abe 8 ioe 5 oe ee 0) 0 0) 12.001 15.001 
af EcttL on 5 pe ia he eee 0 tr 11.014 12.004 15.004 
ahjs LON 8 Ba een 0 tr tr 11.001 15.000 
La hae Se ee Cee eae 0 tr 12.004 14.003 15.004 
LTE. Se 8 i es 0 tr 12.001 14.003 15.001 
ATED kas ee 0 tr 11.001 12.001 15.000 
Ele[| iets ONS aie ae i 0 tr 11.001 13.004 15.000 
Hes A Se Se ee 0 tr 11.001 12.001 15.001 
SEE ee arte ee alee ha 0 tr 12.001 14.005 15.000 
JDL Soe ee ee 0 tr 11.004 12.012 15.001 
2 lls 3 5 aoe a ee ee a 0 tr 11.001 12.001 15.001 
SUDST! 3 A eee 0 tr 12.001 14.001 15.001 
ALS 2 ais oe FOUre as einem eer tr tr 12.004 14.005 15.001 
Ti SUSATS Ay nga ee ae ee 0) tr 11.005 12.001 15.000 
as), ee ee eee eee tr tr 12.004 14.002 15.000 
LETS AY Mae a2 Ae 0 tr 11.005 12.001 15.001 
2S cat See eens nee 0 0 11.001 12.001 15.007 
DSS ae Sh ae eee ae 0) tr 11 001 0 15.001 
ADRS) Fs 7 A Sic a aa 0 tr 11.001 12.001 15.007 
RUE. £5 Se ae SAR ae ee Rant eae 0 tr tr 12.001 15.001 
*Reactions are expressed in the numbering scheme of Coons & Strong (1931), as explained in the text, 
