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*0411 Srivastava, M.P. 1980. Occurrence of Myrothecium leaf spot of =ung bean in Haryana. INDIAN PHYTOPATHOLOGY, v.33(1):137. [En] (A:PS) A leaf spot disease of mungbean was shown to be due to Myrothecium roridum Tode ex Fr. Symptoms consist of oval to circular, fading green to brown spots, 0.5-1.5 cm in diameter, and with characteristic concentric zonations impregnated with dot-like bodies. [EMSJ *0412 Dwivedi, K. ; Shukla, P. 1981. Effect of interaction of nitrogen, phosphorus and potash on Drechslera leaf spot of mulng. INDIAN PHYTOPATHOLOGY, v.34(2):200-202. [En] [En AbstJ (A:PS) Studies on Drechslera leaf spot of mungbean (Vigna radiata) indicated that the plants receiving different dosages on N, P and K were infected by the pathogen (Drechslera halodes). However, it was found that the disease inteltsity was inversely proportional to potassium levels. Various dosages of phosphorus applied to mungbean crop did not play any role in disease susceptibility or resistance. Nitrogen increased the susceptibility, while potassium increased resistance against the disease in host plant. [AS] *0413 Kalia, N.R. ; Sud, A.K. ; Gupta, V.P. 1981. Effect of cultural practices in reducing yield losses due to Cercospora leaf spot in black gram (Vigna mungo (L.) Hepper). PULSE CROPS NEWSLETTER, v.1(3):58. [En] (A:PS) A factorial experiment invo' ring three cultural practices, namely, straw mulching, hand weeding and no weeding, and 3 blackgram varieties was carried out to determine the effect of these factors on Cercospora leaf spot. Mulching was the most effective treatment both in reducing Cercospora leaf spot and increasing yield over the no weeding control. Hand weeding increased both yield and disease severity. Of the 3 blackgram varieties, No. 55 had the least infection. [EMS] *0414 Kamthan, K.P. ; Gurha, S.N. ; Misra, D.P. 1981. Fungicidal control of Cercospora leaf spot of urd bean, Vigna mungo (L.) Hepper. MADRAS AGRICULTURAL JOURNAL, v.68(9):604-606. [En] [En Abst] (A:PS) Thirteen fungicides were studied to control Cercospora leaf spot of blackgram. All were able to control the disease. However, the best control was obtained with Bavistin followed by Bordeaux Mixture, Dithane Z-78, Brassicol and Dithane M-45 with disease indices below 20% while other fungicides controlled the disease with disease indices 20% and above. [AS] *0415 Kwon, S.H. ; Oh, J.H. 1981. Sporulation of Cercospora canescens Ellis and Martin in culture. KOREAN JOURNAL OF PLANT PROTECTION, v.20(1):21-24. [Ko] [En Ko Abstj (REP.MB-2296) This study was conducted to obtain a supply of conidia sufficient for screening mungbean mutant lines for a source of resistance to Cercospora leaf spot caused by Cercospora canescens Ellis and Martin. Abundant sporulation occurred in cultures on mungbean decoction oatmeal agar(MOA) exposed to about 2,500 lux of fluorescent light, but it did not occur in continuous darkness. 105

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 106

*0411 Srivastava, M.P. 1980. Occurrence of Myrothecium leaf spot of =ung<br />

bean in Haryana. INDIAN PHYTOPATHOLOGY, v.33(1):137. [En] (A:PS)<br />

A leaf spot disease of mungbean was shown to be due to Myrothecium roridum<br />

Tode ex Fr. Symptoms consist of oval to circular, fading green to brown spots,<br />

0.5-1.5 cm in diameter, and with characteristic concentric zonations<br />

impregnated with dot-like bodies. [EMSJ<br />

*0412 Dwivedi, K. ; Shukla, P. 1981. Effect of interaction of nitrogen,<br />

phosphorus and potash on Drechslera leaf spot of mulng. INDIAN PHYTOPATHOLOGY,<br />

v.34(2):200-202. [En] [En AbstJ (A:PS)<br />

Studies on Drechslera leaf spot of mungbean (Vigna radiata) indicated that<br />

the plants receiving different dosages on N, P and K were infected by the<br />

pathogen (Drechslera halodes). However, it was found that the disease inteltsity<br />

was inversely proportional to potassium levels. Various dosages of phosphorus<br />

applied to mungbean crop did not play any role in disease susceptibility or<br />

resistance. Nitrogen increased the susceptibility, while potassium increased<br />

resistance against the disease in host plant. [AS]<br />

*0413 Kalia, N.R. ; Sud, A.K. ; Gupta, V.P. 1981. Effect of cultural<br />

practices in reducing yield losses due to Cercospora leaf spot in black gram<br />

(Vigna mungo (L.) Hepper). PULSE CROPS NEWSLETTER, v.1(3):58. [En] (A:PS)<br />

A factorial experiment invo' ring three cultural practices, namely, straw<br />

mulching, hand weeding and no weeding, and 3 blackgram varieties was carried<br />

out to determine the effect of these factors on Cercospora leaf spot. Mulching<br />

was the most effective treatment both in reducing Cercospora leaf spot and<br />

increasing yield over the no weeding control. Hand weeding increased both yield<br />

and disease severity. Of the 3 blackgram varieties, No. 55 had the least<br />

infection. [EMS]<br />

*0414 Kamthan, K.P. ; Gurha, S.N. ; Misra, D.P. 1981. Fungicidal control of<br />

Cercospora leaf spot of urd bean, Vigna mungo (L.) Hepper. MADRAS<br />

AGRICULTURAL JOURNAL, v.68(9):604-606. [En] [En Abst] (A:PS)<br />

Thirteen fungicides were studied to control Cercospora leaf spot of<br />

blackgram. All were able to control the disease. However, the best control was<br />

obtained with Bavistin followed by Bordeaux Mixture, Dithane Z-78, Brassicol<br />

and Dithane M-45 with disease indices below 20% while other fungicides<br />

controlled the disease with disease indices 20% and above. [AS]<br />

*0415 Kwon, S.H. ; Oh, J.H. 1981. Sporulation of Cercospora canescens Ellis<br />

and Martin in culture. KOREAN JOURNAL OF PLANT PROTECTION, v.20(1):21-24.<br />

[Ko] [En Ko Abstj (REP.MB-2296)<br />

This study was conducted to obtain a supply of conidia sufficient for<br />

screening mungbean mutant lines for a source of resistance to Cercospora leaf<br />

spot caused by Cercospora canescens Ellis and Martin. Abundant sporulation<br />

occurred in cultures on mungbean decoction oatmeal agar(MOA) exposed to about<br />

2,500 lux of fluorescent light, but it did not occur in continuous darkness.<br />

105

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