Experiment Station Record, Volume 92, January-June, 1945 Page: 66
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66 EXPERIMENT STATION RECORD [Vol. 92
the early Australian breeders are described, and the current breeding work in
Western Australia is summarized, including the combination' in one variety of the
Kenya C. 6041-type resistance with the Hope type possessed by Warigo, which is
believed to insure as much as possible that in the event of a new race of rust arising
which can attack either parent the variety will remain resistant. Although not rust
resistant in the sense of Kenya and Hope varieties, Kondut-a recent Western
Australian production-is said to be less affected by rust than are Bencubbin and
Nabawa. Among other matters considered are the physiologic races, the carry-over
of the disease, and weather conditions in relation to epidemics.
Rust inhibitor. (Univ. Minn.). (Northwest. Miller, 219 (1944), No. 6, pp.
la, 6a-8a, illus. 4).-A review of the work of E. C. Stakman, with especial reference
to stem rust of wheat.
Fungicides for snow mold control, 0. J. NOER (Greenkeepers' Rptr., 12 (1944),
No. 3, pp. 13-14, 24-25, illus. 4).-Several years' tests of substitutes for the
HgC12 treatment for snow mold-carried out in the Milwaukee, Wis., area-are
summarized. Far-reaching conclusions were believed unwarranted, but indications
were that Calo-Clor, Thiosan, and DuBay 1205-J are the best materials for controlling
this turf disease. Less effective was ZnO, alone or with Ca(OH)2, there
being no evidence of control; Special Semesan was the next least effective material
tried; manganese dimethyl dithiocarbamate gave some control; Spergon, dry or
wettable, did not appear promising.
Varietal resistance to halo blight in beans,.T. D. RAPHAEL and N. H. WHITE
(four. Austral. Inst. Agr. Sci., 10 (1944), No. 2, pp. 76-77).-The results of a
test of 12 varieties are tabulated and briefly discussed.
Soil-inhabiting fungi attacking the roots of maize, W.-C. Ho. (Coop. U. S.
D. A.). (Iowa Sta. Res. Bul. 332 (1944), pp. 401-446, illus. 6).-During this
study the organisms found most often on decayed seeds were Pythium debaryanum,
Gibberella saubinetii, Penicillium oxalicurn, Trichoderma lignorum, and Fusarium
spp.; on diseased roots, Pythium debaryanum, P. graminicola, G. saubinetii, Helminthosporium
sativum, Rhizoctonia solani, T. lignorum, F. moniliforme, and
Fusarium spp.; on mesocotyls, chiefly G. saubinetii, R. solani, H. sativum, Penicillium
oxalicum, T. lignorum, and Fusarium spp.; on plumules, G. saubinetii,
Fusarium spp., and Rhizopus sp.; and on crowns, Diplodia zeae and F. moniliforne.
The fungi may be divided into three groups on the basis of pathogenicity to corn
in greenhouse and field: (1) Highly destructive, Pythium debaryanum, P. graminicola,
and G. saubinetii; (2) moderately destructive, R. solani, H. sativurm, D. zeae,
and Penicillium oxalicum; (3) slightly destructive, Aspergillus niger, F. moniliforme,
T. lignorum, Rhizopus sp., and Fusarium spp. Pyfhium debaryanum was
responsible for heavy seed decay, particularly with soil temperatures below 16 C.
and moisture abundant. G. saubinetii and P. graminicola were also capable of causing
considerable decay where P. debaryanum was scarce or inactive. Initial root
infection was caused by P. ,debaryanum and P. graminicola. G. saubinetii often
caused reddish brown to dark red necrotic lesions on the remaining portions of the
roots but more characteristically produced discoloration and rot of the mesocotyl.
Most strains of H. sativum were only slightly pathogenic, but one strain repeatedly
produced a brownish black discoloration and rot of the mesocotyls and roots. Except
for a strain of Rhizoctonia solani, the other fungi proved to be either secondary
invaders or saprophytes.
In general, the combination of two active pathogens, such as P. debaryanum with
G. saubinetii, seemed to increase the disease severity. Combinations of an active
pathogen with a nonpathogenic or saprophytic form sometimes decreased the severity
of the injury as compared with that produced by the active pathogen alone.
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington. (digital.library.unt.edu/ark:/67531/metadc5064/m1/79/: accessed February 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.