PNABD246.pdf

to be poor indicators of yield loss due to variation in the onset of epidemic.
Areas under the disease progress curve were better correlated with yield loss
under normal situations. [AS]
- Powdery Mildew
*0431 Tai, F.L. 1936. Notes on Chinese fungi. 6. Additional notes on
Erysiphaceae of China. BULLETIN OF THE CHINESE BOTANICAL SOCIETY,
v.2(1):16-28. [EnJ (REP.MB-2386)
Sphaerotheca humuli (DC) Burr. var fuliginea is reported to infect Vigna
mungo. [THH]
*0432 Uozumi, T. ; Yoshii, H. 1953. Some observations on the mildew fungus
affecting the cucurbitaceous plants. PHYTOPATHOLOGICAL SOCIETY OF JAPAN,
ANNALS, v.16(3/4):123-126. [Ja] [En Abst] (REP.MB-2454)
Erysiphe cichoracearum DC., Sphaerotheca fuliginea (Schlecht.) Poll., and
S. humuli (DC.) Burr. are reported as the powdery mildew fungi attacking
cucumber and other members of cultivated cucurbitaceous plants. S. fuliginea is
the only cause of the mildew of the cucurbitaceous plants. The occurrence of
perithecial formation of S. fuliginea on cucurbitaceous hosts is not uncommon
in Fukuoka late in the fall, though it is said difficult to find the perithecia
in other districts of Japan. The mildew fungi (E. cichoracearum and others)
obtained from Nicotiana tabacum, Artemisia vulgaris, Sesamum indicum, and
Bidens bipinnata are not infectious to cucumber, while the fungus from Arctium
lappa (S. fuliginea) is pathogenic to cucumber. S. fuliginea from cucumber is
infectious to Arctium lappa and Vigna radiata, but is not infectious to Solanum
melongena, Chrysanthemum coronarium, Helianthus tuberosum, H. annuus, and
Nicotiana tabacum. The difference of resistance due to the difference of ages
of the leaves of cucumber against the infection by S. fuliginea has been
observed. Young leaves which had past 0 to 3 days before the inoculation, in
this experiment, were not affected when examined 5 days after inoculation, and
the most susceptible leaves were those which had past 16 to 23 days before the
inoculation. [AS]
*04j3 Rao, P.G. ; Rao, N.R. 1955. Preliminary observations on the control
of powdery mildew in black and green grams. ANDHRA AGRICULTURAL JOURNAL,
v.2(6):317-319. [Enj (REP.MB-2448)
All of the four fungicides (Ultra Sulphur, spersul, sulphur dust and
Bordeaux mixture) evaluated against powdery mildew of mungbean and blackgram
reduced infection in both crops, but only a slight yield increase occurred in
blackgram. [EMS]
*0434 Wang, T.S. 1965. Studies on powdery mildew diseases. PLANT
PROTECTION BULLETIN (R.O.C.), v.7(4):199-200. [Ch] (REP.MB-1161)
Mungbean is a new host of Sphaerotheca fuliginea in Taiwan. [THH]
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