PNABD246.pdf

The conditions that produced maximum number of conicia was not coincided with
those for vegetative growth and pigmentation in culture medium. Removal of
aerial mycelium in culture by brushing with sterile water so enhanced the
conidial production that oatmeal agar medium(OA) could be useful for production
of abundant conidia by the treatment. [AS]
*0416 Marimuthu, T. ; Sivaprakasam, K. 1981. Effect of carbendazia on the
growth of n ngbean and disease incidence. PULSE CROPS NEWSLETTiVR, v.1(2):67.
[EnJ (A:PS)
Carbendazim spray caused reduction in plant height and number of leaves and
flowers per plant in mungbean. The reduction was more pronounced at higher
fungicide concentrations and/or spraying frequencies. However, because of its
outstanding effectiveness in controlling Cercospora leaf spot, the fungicide is
still recommended, but should be sprayed at lower rates and not more than twice
at 20 days interval for control of the disease. [EMS]
*0417 Singburaudom, N. ; Parichartsombat, S. ; Wongwattanarutana, P.
Jarupat, T. ; Pupipat, U. 1981. Study on wingbean diseases in Thailand and
their control. KASETSART UNIVERSITY, RESEARCH REPORTS, p.17-18. [Enj [ThJ
($293.K3 1981)
Mungbean cultivars, CES 21 D end 147 A, were used to study the disease
incidence of Cercospora leaf spot (CLS). The experiment was conducted under the
r.atural condition in the field with 3 levels of plant population density and 2
methods of planting, row planting and broadcasting. Cv. M 7 A showed decrease
in leaf area, lower quantity of disease incidence and increase in yield in row
planting when compared to broadcasting. The leaf area of CES 21 D was not
affected by planting methods, while the disease incidence was low in row
planting an.d high yield was found in broadcasting. A mix of benomyl and Delsene
Mix was used to study the application time for controlling CLS. The fungicides
were sprayed three times at 40, 50 and 60 days after emergence and two times at
40, 60 and 40, 70 days after emergence. The result indicated that three times
of spraying fungicide was the best for control of this disease, only 7.01% of
leaf area was afiected by disease. Statistical significance was not detected on
yield between three times and two times of application, but slight significance
was found between spraying and non-spraying. The yield loss caused by
Cercospora leaf spot was 68.3%. [PLH]
*0418 Menancio, D.I. ; Ramirez, D.A. 1982. Biochemical basis of resistance
to Cercospora leafspot in mungbean Vigna radiata L. Wilczek. PHILIPPINE
JOURNAL OF CROP SCIENCE, v.7(i):27-30. [En] [En Abstj (A:PS)
(NOTE: The abstract was presented at the 13th Annual Scientific Meeting
the
of
Crop Science Society of the Philippines, Apr 28-30, 1982)
Four phytoalexin-like substances, designated as compounds 1,2,3 and 4 were
isolated by thin-layer chromatography in benzene: methanol (9:1 v/v) from two
resistant varieties of mungbean (V. radiata (L.) Wilczek) following infection
with Cercospora canescens Ellis and Martin. The four compounds had Rf values of
0.43, 0.32, 0.27 and 0.04, respectively, -.nd exhibited bright-blue and
bright-purple fluorescence under ultrav o.et light and orange and brown colors
when sprayed with diazotized para-nivrcaniline (DPNA). Bioassay results showed
different inhibitory effects of the compounds on hyphal and mycelial growth of
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