Survey for the powdery mildew of black gram [Vigna mungo (L.) Hepper] in parts of Northern Karnataka, India.

2017 ◽  
Vol 6 (03) ◽  
pp. 5309
Author(s):  
Shripad Hanmntrao Kulkarni* ◽  
Channaveeresh T. S.
Keyword(s):  
Powdery Mildew ◽  
Disease Severity ◽  
Vigna Mungo ◽  
Black Gram ◽  
Rabi Season ◽  
Erysiphe Polygoni ◽  
Severity Of The Disease ◽  
Cent Disease

Powdery mildew caused by Erysiphe polygoni DC is one of the major constraints in the production of black gram, which lead to a potential decrease in yield (40-90%). In order to know the severity of black gram powdery mildew, the roving survey was carried out to know the severity of the disease in five districts of northern Karnataka viz., Belgaum, Dharwad, Gadag, Haveri and Uttara Kannada districts during Kharif and Rabi season of 2012-13. Maximum mean per cent disease severity (PDI) was observed in Belgaum district (68.72%) followed by Dharwad district (59.73%), Haveri district (52.10%) and Uttara Kannada district (44.59%). Whereas, minimum per cent disease severity (PDI) was noticed in Gadag district (20.23%).

Management of powdery mildew of black gram (Vigna mungo) caused by Erysiphe polygoni

2016 ◽  
Vol 35 (1) ◽  
Author(s):  
M. Jayasekhar ◽  
E. G. Ebenezar
Keyword(s):  
Powdery Mildew ◽  
Castor Oil ◽  
Field Experiments ◽  
Disease Incidence ◽  
Cost Benefit ◽  
Black Gram ◽  
Ampelomyces Quisqualis ◽  
Cost Benefit Ratio ◽  
Erysiphe Polygoni ◽  
Cent Disease

Two field experiments were conducted by using cheap and ecofriendly plant products and biocontrol agents for the management of powdery mildew disease caused by <italic>Erysiphe polygoni</italic> in black gram which is causing severe yield loss. The mean per cent disease incidence ranged from 15.80 to 47.70 in different treatments. The maximum reduction of disease incidence was recorded in wettable sulphur 0.25% (15.80%) followed by carbendazim 0.1% (58.91%) and castor oil 1% with <italic>Ampelomyces quisqualis</italic> (48.53 %) However castor oil 1% followed by <italic>A. quisqualis</italic> application at 10 days interval recorded 20.28 per cent increased yield with maximum cost benefit ratio of 1 : 2.01

Screening black gram genotypes under artificially inoculated conditions for powdery mildew resistance

2017 ◽  
Author(s):  
S. Priyanka ◽  
S. Rangaiah ◽  
R. Pavan
Keyword(s):  
Powdery Mildew ◽  
Genetic Resistance ◽  
Resistance Breeding ◽  
Cost Effective ◽  
Black Gram ◽  
Resistant Varieties ◽  
House Condition ◽  
Cent Disease

An effective and durable genetic resistance in black gram genotypes against powdery mildew provides a cost effective and reliable strategy to reduce the yield losses and save quality of the harvest. The identification of potential resistant source(s) is the most crucial step in disease resistance breeding. In the present study, out of 116 genotypes screened, genotype LBG-645 recorded lowest per cent disease severity of 0.77 and was found to be highly resistant to powdery mildew under green house condition. Under in vitro condition also, LBG-645 which was found to be highly resistant with 3.33×103 conidia colony, 0.94 per cent of leaf area covered by powdery mildew and 1.00 colony per leaflet was recorded. Hence, resistant genotype LBG-645 must be used in further breeding programme for the development of resistant varieties of black gram against powdery mildew.

scholarly journals Evaluation of fungicides for management of anthracnose disease of black gram (Vigna mungo l.) in growing areas of district Jhansi of Bundelkhand region

2020 ◽  
Vol 12 (2) ◽  
pp. 110-114
Author(s):  
Adesh Kumar ◽  
Roomi Rawal ◽  
Nishi Roy ◽  
Atik Ahamad ◽  
Hitesh Kumar
Keyword(s):  
Disease Control ◽  
Disease Severity ◽  
Field Condition ◽  
Seed Treatment ◽  
Disease Incidence ◽  
Foliar Spray ◽  
Uttar Pradesh ◽  
Vigna Mungo ◽  
Black Gram ◽  
Anthracnose Disease

Black gram (Vigna mungo L.) growing areas of district Jhansi coming under Bundelkhand region of Uttar Pradesh were surveyed during Kharif 2018 for the occurrence of anthracnose disease of black gram. A total of 22 villages were visited under six blocks of Jhansi during this period. Blockwise comparison of the survey in Jhansi revealed that less mean disease incidence (10%) and severity (4.0%) occurred in the Chirgaon block. Highest disease incidence (24%) and severity (12%) were observed in block Moth.  The block Bangra, Babina, Badagaon, and Bamour secured disease incidence 23.5, 20, 16.44 and 15% and severity 15.14, 12, 7.44 and 8.5% respectively. Nine fungicides (viz. [email protected]%, tilt @0.1%, [email protected]%, [email protected]%, [email protected]%, dithane [email protected]%, amistar top, [email protected]% and [email protected]%) were tested against anthracnose disease of black gram under field condition.  Among them, seed treatment with carbendazim@ 3gram/kg seed and foliar spray of mixture of azole and strobilurin group T3- [email protected] ( tebuconazole + trifloxystrobin) and T7-amistar [email protected]%  (azoxystrobin+ difenoconazole) were found significantly (at 0.05%) superior over the rest of treatments, both showed minimum (6%) disease severity with maximum (78.51%) disease control. Significant (at 0.05%) increase in yield (47.5%) also observed in both treatments T3 and T7.  The treatment T1- Spray of  [email protected]%, T2-  Spray of  Tilt @0.1%, T4- Spray of  [email protected]%, T5- Spray of  [email protected]%,  T8- Spray of [email protected]%, T9- Spray of [email protected]% also showed good results in reducing the black gram anthracnose disease severity per cent (64.29, 57.14, 64.28, 57.14, 71.42 and 64.28 and also increased the yield per cent 37.5, 35, 42.5, 36.25, 45 and 45 respectively.

Effect of sowing dates, crop geometry and host range on powdery mildew (Erysiphe polygoni) of fenugreek, Trigonella foenum graecum L.

1970 ◽  
pp. 86
Author(s):  
R Kumawat*, K S Shekhawat & K Kumawat
Keyword(s):  
Powdery Mildew ◽  
Seed Yield ◽  
Calendula Officinalis ◽  
Sowing Dates ◽  
Erysiphe Polygoni ◽  
Lathyrus Odoratus ◽  
Serious Disease ◽  
Cent Disease ◽  
Trigonella Foenum Graecum L ◽  
Crop Geometry

In Rajasthan, fenugreek crop is attacked by a number of diseases. Powdery mildew of fenugreek is an important and serious disease caused by Erysiphe polygoni. Date of sowing and crop geometry greatly influenced the disease intensity of powdery mildew on fenugreek during the two consecutive years 2012-13 and 2013-14. Early sown crop exhibited more disease development as compared to late sown crop. November 30th sown crop recorded minimum per cent disease intensity, whereas 10th October sown crop recorded maximum per cent disease intensity and minimum seed yield. The crop was sown on 30th October registered maximum seed yield (16.48 q/ha) with 61.10 per cent disease intensity. The wider spacing of 15 x 45 cm, 15 x 30 cm and 10 x 45 cm between rows and within rows recorded minimum per cent disease intensity (36.11, 39.66 and 45.39) respectively. However, closer spacing 5 x 15 cm recorded maximum seed yield and per cent disease intensity. Out of fifteen host species powdery mildew symptoms were observed on Pisum sativum, Cuminum cyminum, Coriandrum sativum, Calendula officinalis, Lathyrus odoratus and Foeniculum vulgur under caged conditions.

scholarly journals The dynamics of powdery mildew development on pumpkins

2019 ◽  
pp. 111-123
Author(s):  
S. Mykhailenko ◽  
O. Melnyk
Keyword(s):  
Powdery Mildew ◽  
Disease Severity ◽  
Weather Conditions ◽  
Disease Spread ◽  
Forest Steppe ◽  
Erysiphe Cichoracearum ◽  
Significant Difference ◽  
Severity Of The Disease ◽  
The Right ◽  
Powdery Mildew Infection

Goal. To determine the spread and development of powdery mildew on pumpkins in the Forest-Steppe of Ukraine. Methods of investigation. The experiments were carried out in 2016—2018 biennium in the Right-Bank Forest Steppe of Ukraine (Khmelnytsky region) on the following varieties: common pumpkins — Ukrainskyi bahatoplidnyi, hull-less — Shtyriiskyi. Assessment of severity and spread of powdery mildew was carried out by conventional methods. The records were taken by visual method at 51, 73 and 89 stages (BBCH scale). Ten plants per plot were selected and spread and severity of the disease in percentage were determined. Results of investigation. During the period of investigation, powdery mildew was observed on the pumpkins of both varieties annually. Its first sympthoms were noted at the 15—17 stage. According to the morphological and biometric features, the pathogen identified as Erysiphe cichoracearum (DC.) V.P. Heluta. In the varieties studied, powdery mildew was found with a non-significant difference in severity and spread. In 2016, the severity of powdery mildew on pumpkins of variety Ukrainskyi bahatoplidnyi varied in the range of 15.4—19.5%, disease spread — 45.1—49.6%, on variety Shtyriiskyi development was 13.3—17.5%, distribution — 46.2—48.1%. In 2017, we obtained the following results: the disease severity for common pumpkins was in the range 13.2—17.4%, disease spread — 42.8—46.7%, for hull-less pumpkins disease severity was 12.2—16.8%, disease spread — 41.7—45.3%. In 2018, severity of powdery mildew was higher than in previous years, accounting for 21.2—26.7% with spread 50.4—55.2% on common pumpkins, and 19.4—25.3% with spread 48.8—54.2% on hull-less pumpkins. The correlation analysis of the data showed that the closest correlation between the spread and the development of the disease was observed with the precipitation and GTC in June. Conclusions. Dynamics of severity of powdery mildew during 2016—2018 years on common and hull-less pumpkins were studied. At stage of full ripening, the maximum rates of spread and severity of the disease were noted, which averaged 49.2—50.5% and 19.9—21.2% over the three years, respectively. No significant difference in the powdery mildew infection between common pumpkins (variety Ukrainskyi bahatoplidnyi) and hull-less pumpkins (variety Shtyriiskyi) was found. The defining conditions for the development of powdery mildew on pumpkins are the weather conditions in June, most notably the presence of increased moisture during this period.

Influence of sowing dates on the incidence of powdery mildew of chilli

2017 ◽  
Vol 4 (2) ◽  
Author(s):  
SUDHEENDRA A. ASHTAPUTRE
Keyword(s):  
Powdery Mildew ◽  
Field Experiment ◽  
Disease Severity ◽  
Agricultural Research ◽  
Time Interval ◽  
Research Station ◽  
Inoculum Potential ◽  
Weather Factors ◽  
Agricultural Research Station ◽  
Sowing Dates

A field experiment was conducted during kharif, 2005 at Agricultural Research station, Devihosur, Haveri, Karnataka to assess the progress of powdery mildew at different time interval of sowing dates. Totally 20 different dates of sowings were imposed in the experiment at an interval of 10 days. The crop sown on last week of May to mid of June recorded minimum disease severity compared to rest of the date of sowings. This clearly indicated that crop sown during this period suffers less, which may be due to low inoculum potential, whereas late sown crop suffers more because of the readily available inoculum in the early sown crops. Low disease severity in last week of May to mid of June sowing may be attributed to the non-congenial weather factors for the development of the disease.

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