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Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Dist. - Nadia, West Bengal PIN - 741 252
The university established in 1974, has completed five decades of its existence as the pioneer institute of Agricultural Education, Research and Extension. The main objective of this Viswavidyalaya is to provide facilities for the study of Agriculture, Horticulture and Agricultural Engineering. It is also to conduct researches in these sciences and undertake the educational and extension programmes in agriculture among the rural clientele base, keeping in view the requirements of the state.
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ThesisItem Open Access Soil biotic and abiotic factors influencing plant diseases in rice based cropping system with different regimes of conservation agricultural practices(Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia – 741252, 2023-12-20) DASGUPTA AMRITA; Dr. Subrata DuttaConservation agriculture (CA) aims to conserve, improve and make more efficient use of natural resources through integrated management of soil, water and biological resources combined with external fertilizer inputs. At early stage of CA there appear some serious issues related to supplying sufficient nutrients to the crops to achieve economically viable yields. These issues can be addressed by strengthening microbial interaction and optimizing soil biological activity through self-sustaining biological systems rather than reliance on external inputs or synthetic fertilizers. Modern agriculture is input and energy intensive and highly torturous in nature thus, becoming threats not only to microbial world but to whole ecology and environment. Thus, it is high time for the farmers and agriculturists to address the issues of environmental sustainability along with eco-friendly management practices for harnessing sustained crop productivity to ensure the future food security goal. Conservation agriculture (CA), offers low mechanical disturbance, crop rotation, retention of diverse crop residues and release of diversified chemical compounds as rhizo-depositions to soil and maintaining a protected, cozy habitat for microbes is well ahead biodynamic technology for sustainable crop production. Practices of CA are capable of regenerating and conserving top soil by restoring microbes, and ecosystem services and manage the disease dynamics in field crops under natural conditions. Scanty of literature has been available on the details of microbial population dynamics along with vis –a-vis plant disease dynamics under intensification of CA practices. In the current experiment, microbial dynamics, disease dynamics and yield was assessed and some of the important disease prediction models were developed under rice-wheat-green gram (R-W-G) and rice-mustard-black gram (R- M-B) cropping system under different degrees of CA practices. In the present study, it was observed that zero tillage was found to significantly increase the total bacterial, total fungal, total Actinomycetes and total Bacillus population, whereas, reduced tillage favoured the total phosphate solubilizing bacteria (PSB), total Pseudomonads population and nitrogen fixing bacterial (NFB) population. Real time (RT) PCR was performed to evaluate the population dynamics of Alphaproteobacteria, ii Betaproteobacteria and Gammaproteobacteria under three tillage different systems and it was found that intensification of CA practices favoured the Proteobacterial population dynamics, when compared to conventional tillage system. In the current study, dehydrogenase enzyme activity was also performed for better understanding of microbial enzyme activity under different tillage systems in combination with different nutrient- residues level. Zero tillage along with NR2 (100% residue + 50% RDF) performed the best, with highest enzyme activity in both the cropping system, proving effects of tillage systems and residue retention on microbial activity. Thus, a hypothesis that keystone microbial clads were well conserved in CA under microclimate created due to less soil disturbance, habitat restoration, cover cropping, crop rotation etc. ,is put forward. Population dynamics of Sclerotium rolfsii was evaluated along with the suppressiveness and conducivenesss of the soil under different regime of CA practices. In both the cropping systems (R-W-G & R-M-B), the maximum sclerotial population of Sclerotium rolfsii was observed in conventional tillage system as compared with CA practices. A meta-analysis was performed to assess the changes in microbial abundance under varying degrees of CA. Different tillage practices were the most important factors in defining the structure of bacterial communities and β-diversity matrix showed that reduced tillage (RT) and zero tillage (ZT) are closely related to each other whereas conventional tillage (CT) is distantly related to them, which is the reflection of management followed in these scenarios. Abundance at genus level showed that zero tillage and reduced tillage exhibited higher abundance of Bacillus when compared to conventional tillage. Streptomyces and Spingomonas showed similar kind of result, with maximum abundance in reduced tillage, followed by conventional tillage and zero tillage. Pseudomonas, on the other hand, showed maximum abundance in reduce tillage, followed by zero tillage and conventional tillage. The present study clearly demonstrated that the structure and diversity of soil bacteria in reduced tillage were significantly different compared with other tillage practices. Also the dynamics of naturally occurring plant diseases of rice (blast, brown spot, bacterial blight and sheath blight), wheat (leaf blight disease), green gram (Cercospora leaf spot disease), mustard (Alternaria blight and downy mildew) and black gram (Cercospora leaf spot disease) under rice-wheat-green gram and rice-mustard-blackgram cropping system were evaluated and it was observed that severity of some of the diseases are comparatively less with increasing intensity of CA practices and it was also observed iii that severity of the majority of rice diseases were less in reduced tillage system. Studies were also conducted for understanding the influence of different weather factors, micro- climatic variables and soil temperature on important diseases in R-W-G and R-M-B cropping system under varying degrees of CA practices. Disease prediction equations were developed based on 2 years data (2019-20 & 2020-2021) for few important diseases to understand the significant disease predicting weather and micro-climatic variables under different rgime off CA practices. In case of Cercospora leaf spot disease of green gram, different prediction models (multiple regression model, logistic regression model and canonical discriminant function model) had been compared and it was observed that canonical discriminant analysis model performed better in predicting the disease risk in comparison to other two models. Outcome of this study will be helpful to the farmers for adopting CA, particularly, in tropic and subtropical countries where agriculture is greatly relying on the benefits derived from plant–microbe interactions.ThesisItem Open Access EPIDEMIOLOGY AND MANAGEMENT OF LENTIL DISEASES WITH SPECIAL REFERENCE TO COLLAR ROT DISEASE IN LOWER GANGETIC PLAINS OF WEST BENGAL(PLANT PATHOLOGY, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia – 741252, 2023-12-20) NAZNEEN HUMA; Dr. Raju DasLentil is one of the oldest known protein-rich grain legumes in the winter cropping system of Indo-Gangetic plains including lower Gangetic Bengal (LGB) and provides a balanced diet with high nutritional value. Lentil productivity in this zone is seriously impeded due to the prevalence of several biotic stresses. Collar rot, lentil blight complex (LBC) and rust are major problems for lentil not only in Eastern India, but throughout the South Asia. Collar rot disease incited by Sclerotium rolfsii Sacc. is one of the most dreaded soil borne diseases of lentil and is found to cause yield losses of up to 50% in the farmer’s field (Asghar et al., 2018). Most importantly there is no resistant genotype of the lentil crop against collar rot disease and chemical control is not also effective against this soil borne disease. In the present investigation, a comprehensive effort has been made to study the disease situation of different diseases of lentil under lower Gangetic plains of West Bengal; screening and identifying promising stable tolerant lentil genotypes against major diseases of lentil under field conditions, developing a forewarning model for successful prediction of collar rot disease and development of biorational management package utilizing plant extracts, bioagents, inducers and chemical fungicides for efficient eco-friendly management of S. rolfsii inciting collar rot disease of lentil. Thus, taking a holistic view on all these aspects, an intensive survey was conducted in major lentil growing districts of West Bengal, viz. Nadia, North 24 Paraganas, Malda and Murshidabad in the months of November–March (2018-19, 2019-20 and 2020–21).The present survey study reflected that lentil fields were infected with three main fungal diseases: Collar rot (Sclerotium rolfsii), lentil blight complex (LBC) and rust (Uromyces viciae-fabae) disease. Collar rot and LBC were the most widespread, while lentil rust occurred little comparatively to both diseases. There was no individual occurrence of either Alternaria or Stemphylium blight rather mixed infection was obtained in a complex manner. To the best of our knowledge, this is the first report of mixed infection of A. alternata and S. botryosum in a complex manner followed by successful isolation of S. botyrosum and confirmation of the pathogens by sequencing through ITS and Stemphylium specific gpd1 and gpd2 primers. Higher disease response was observed in normal sown fields for collar rot disease whereas for lentil blight and rust, the highest disease severity was observed in late sown fields. Ensuring lentil planting during the second fortnight of November can mitigate the climate mediated disease risk. Soil texture played a significant role in the collar rot development, viii more pronounced in light textured soil. Intercropping with mustard and okra individually considerably reduced the DI for collar rot disease as compared to other intercropping patterns. For collar rot disease, ILL-10802 was observed as highly tolerant with only 2% DI and HUL-57 as highly susceptible with 34.7% DI. For blight and rust diseases, the highly tolerant varieties were Pusa ageti (DS 5.4%) and IPL-526 (DS 3.2%) respectively, whereas local varieties were susceptible to both diseases. Screening of lentil genotypes for resistance against collar rot (Sclerotium rolfsii) reflected that the effect of genotype, environment and the genotype environment interaction (GEI) were significant among the tested lentil genotypes albeit G (genotypes) found to exert a greater effect compared to the environment in this variation. Among the locations, the highest mean collar rot disease incidence irrespective of genotypes (including check) over 3 years was observed in Chakdah location (19.18%) followed by Kalyani location (16.46%), whereas the lowest mean incidence was observed in Sekhampur location (13.84%). Amid the genotypes, the significantly lowest average collar rot disease incidence (2.26%) was observed in WBL-58 followed by IPL-603, PL-254, X2012S-186-S20 and TCADL-18-2. From the GGE biplot for resistance against collar rot (Sclerotium rolfsii), PL-254 was considered as the "ideal" genotype and WBL-58 and IPL-603 were recognized as "desirable" genotypes with coherent response over the tested locations. Over the years, Sekhampur location displayed closest angle with "AEC abscissa," than the other 2 locations thus being identified as "representative". Therefore, Sekhampur location with the highest desirability index (4.264) was considered as the “ideal location” for screening against collar rot in lentil. Chakdah location and Sekhampur location were grouped in upper mega environment and Kalyani location during both the years grouped in the lower mega environment. In upper mega environment ME- I, IPL-603 was the only best performing genotype and in ME- II, WBL-58 and X2012S-186-S20 were the winning genotypes but in comparison to X2012S-186-S20, WBL-58 genotype exhibited high stability. Screening of lentil genotypes for resistance against lentil blight complex (LBC) (Alternaria/Stemphylium) reflected that the effect of genotype, environment and the genotype environment interaction (GEI) were significant among the tested lentil genotypes although, G (genotypes) contributed higher in comparison to the environment in this total variation. Among the locations, the highest mean LBC disease severity irrespective of genotypes (including check) over 3 years was observed in Chakdah (23.84%) followed by Kalyani ix (20.08%), whereas the lowest mean severity was observed in Sekhampur (16.08%). Amid the genotypes, the significantly lowest average LBC disease severity (9.49%) was observed in IPL-239 followed by PL-7, DPL-62, TCADL-19-5 and BCL-1296. From the GGE biplot for resistance against lentil blight complex (LBC) (Alternaria/Stemphylium), DPL-62 was the "ideal" genotype and TCADL-19-5 followed by BCL-1296 were recognized as "desirable" genotypes. Kalyani location with the highest desirability index (4.252) was considered as the "ideal" location for screening against LBC disease severity in lentil. Stepwise multiple regression analysis (MRA) and canonical discriminate model could predict only 51.9% and 71.7% respectively of the variations of S. rolfsii disease incidence. Among the different prediction models, Binary logistic regression model was found to be the most sensitive model and successfully predicted 77.8% of disease risk and no-risk periods in the testing data set. Among the thirteen soil abiotic factors and weather variables examined, ((Soil TM(5cm), Soil TM(15cm), Soil TM(30cm), Soil TE(5cm) and Soil TE(30cm)) were found to be the significant parameters in predicting disease occurrence in the binary logistic regression model. Biochemical parameters phenol, antioxidant enzymes PPO, PAL and SOD were found to be significantly negatively correlated with collar rot disease incidence indicating that these enzyme activities might play a major role in attributing resistance towards host-pathogen interactions. In the field experiment, it was observed that the seed and soil treatment with microbial consortia (GP8: Pseudomonas aeruginosa and B11: Bacillus subtilis) and conjoint application of chitosan (seed treatment) and Ageratum plant extract (soil drenching) checked both pre and post emergence damping off/ collar rot disease of lentil and enhanced the yield of lentil. Thus, this bio-intensive disease management package may in the future be used in a large scale in this zone for cheap and eco-friendly management of soil borne diseases in different cropping systems.ThesisItem Open Access Characterization of spot blotch of wheat pathogen and defining their mechanism of resistance or susceptibility in wheat(Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia – 741252, 2023-12-20) CHAKRABORTY SUNANDA; Dr. Sunita MahapatraWheat (Triticum aestivum L.) is a dominant staple crop cultivated in an area of around 215 million hectares, across wide range of latitudes covering around 89 countries of the world. Out of the total global area under wheat cover, an estimated 25 million ha is infected by spot blotch disease of which 40% is India’s share. Considering the importance of the pathogen under West Bengal conditions, the following objectives for the research work was formulated: 1) Identification and characterization of fungi associated with spot blotch of wheat and their pathogenecity assessment on host 2) Determination and correlation of ecological and phenological factors responsible for occurrence and host preference of spot blotch pathogen and 3) Determination of resistance in different wheat varieties and relative susceptibility to spot blotch disease. The roving survey conducted in Nadia and Murshidabad revealed that the disease severity ranged from 44.03% to 81.48% and the highest disease severity (DLA%) was observed in Domkol-Taraf (81.48%), while the lowest value was observed in Ghaat more, Krishnanagar - Karimpur route (44.03%). Among the twelve isolates of Bipolaris sorokiniana collected from the locations, BSC11 was found to be most aggressive, based on Percent Disease Index, Incubation Period, Latent Period and Lesion size. The disease severity, observed in spot blotch susceptible genotype K 1317, was positively correlated with number of spores, growth rate of mycelium and lesion size, whereas, length of the spore, incubation period, latent period were negatively correlated with disease severity. The molecular characterization of the twelve isolates with ITS1/ITS4 primer pair produced amplified product at ~600bp. For assessment of ecological and phenological factors responsible for occurrence and host preference of spot blotch pathogen, leaf tip necrosis (LTN), lesion mimic (Lm), lesion size (LS), lesion type (LT), leaf angle (LA) and chlorophyll content was evaluated on fifty wheat genotypes during the rabi season of 2020-21, 2021-22 and 2022-23. It was observed that with increase in Lm, LT, LS and LA, there is a significant increase in Disease Leaf Area, whereas with increase in LTN and Area Under SPAD value Decline Curve, Disease Leaf Area was significantly decreased. It indicated that Plants with leaf tip necrosis, higher chlorophyll, erect leaves, without lesion mimic, and smaller lesion lesion size might be chosen for tolerance to spot blotch. Field screening of wheat genotypes conducted during the rabi season of 2020-21, 2021-22 and 2022-23 revealed that the genotypes DBW 252, DBW 386, PBW 899, PBW 897, HI 1612, HI 1653, HD 3086, HD 3293, DBW 187 showed resistant reaction. Whereas, the genotypes DBW 303, PBW 644, PBW 771, PBW 872, PBW 887, PBW 891, PBW 893, HI 1654, HI 1674, HI 1675, HD 2932, HD 2967, HD 3369, HD 3385, HD 3470, HD 3471, GW 538, GW 542, WH 1402, CG 1036, UP 3102, MACS 4100, MACS 6814, NIAW 3170, JKW 261, MP 3557 showed moderately resistant reaction. Similarly, the genotypes DBW 380, GW 322, GW 547, WH 1311, CG 1040, recorded moderately susceptible disease reaction and DBW 398, PBW 889, GW 513, GW 543, UP 3111, UAS 3080, LOK 79, K 1317, Raj 4083 recorded susceptible reaction among the 50 genotypes screened. The analysis of yield attributes revealed that Maximum Panicle Length was obtained in PBW 897, PBW 899, PBW 889, HD 3293,GW 513, NIAW 3170, whereas, minimum value was observed in Raj 4083, followed by HD 3471. Maximum number of grains per panicle was noticed in PBW 897, HI 1653, HD 3086, DBW 252, and minimum in Raj 4083, followed by MACS 6814 and WH 1311. Maximum Thousand Grain Weight was noticed in DBW 252, PBW 893, HI 1653, whereas minimum thousand grain weight was recorded in GW 543, HD 3086 and HD 3293. Biochemical characterization was conducted considering total phenol content, Polyphenol oxidase activity and Phenylalanine ammonia lyase activity at different intervals. A significant negative correlation was observed between Diseased Leaf Area with Phenol content at 24 hours after inoculation (hai), Phenol content at 48 hai, Phenol at 72 hai, PPO activity at 7 days after inoculation (dai), PPO activity at 15 dai, Phenylalanine Ammonia Lyase activity at 0, 24, 48 and 72 hai. Molecular characterization of nineteen genotypes was done from the fifty genotypes collected. Twelve SSR primers were taken for assessment, out of which six primers, i.e., Xgwm148 (200bp), Xgwm374 (200 bp), Xgwm295 (220 bp), XWGGC7412 (70 bp), Wmc335 (140 bp) and Xgwm425 (100 bp), exhibited polymorphism. Among the genotypes, PBW 897 exhibited resistance reaction as well as positive reaction with the primers, except primer Xgwm 425. Among the primers, three primers Xgwm374, Xgwm295 and Xgwm425 exhibited signification reaction when assessed in the genotypes on the basis of Diseased Leaf Area (DLA%). The isolates of Bipolaris sorokiniana collected in this study can be further subjected to diversity analysis using specific SSR markers. The outcome of the present investigation may be utilised further for selection of genotypes for resistance breeding against spot blotch of wheat at field as well as molecular levels.ThesisItem Open Access Epidemiological modelling and eco-friendly management of rice blast(Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia – 741252, 2023-12-20) DEBNATH DEBANJANA; Dr. Sunita MahapatraRice generally grown in different agro-climatic situations in every continent although its productivity is generally affected by numerous abiotic and biotic stresses. Among all the biotic stresses, rice blast caused by Magnapothae oryzae B. Couch (anamorph Pyricularia oryzae Cavara) is one of the most harmful fungal disease that leads to grain yield losses up to 70 to 80%. Several environmental factors including temperature, rainfall, humidity has immense contribution for the disease development, infection rate and spread of the disease. Rapid climatic changes along with increasing global warming is contributing in spreading of the rice blast disease in other part of the world where rice is growing regularly. Increasing harmful effect of chemical fungicide causing serious damage to environment and as well as non-target organism during chemical management practices. A sound management strategy compiling the identification of novel resistance gene in different cultivars, use of bio antagonist, alteration of planting date, use of elicitors can be considered as the effective and as well as sustainable approach for combating against this disease. As belonging to the most important rice grown areas, eastern region (especially West Bengal), should come upon in the top of the priority list where the forecasting system can be developed and can be applied for or combating rice blast disease. Keeping all these in mind, the objectives of the present studies are as mentioned bellow: 1) To identify the critical key factors responsible for rice blast disease development in field condition and pathogen development in lab condition. 2)To develop spatial and temporal model of rice blast for eastern region. 3)To develop eco-friendly and non-conventional way of management for rice blast. A survey was conducted for getting idea about the disease prevalence in some rice growing districts of West Bengal in 2018, Rabi season and it was observed that highest disease severity was noticed in West Midnapur (41.67%) on Satabdi variety and minimum was in North 24 Pargana (10.00%) on Lal minikit variety. In invitro condition in different growth medium PDA produced maximum growth (89.00mm) and sporulation (18.00/10 μl) of P.oryzae and minimum growth was in Czepk Dox Agar(30.33mm) whereas, least sporulation was in Carrot Dextrose Agar medium(0.33/10 μl). Among the different carbon sources used in media, the highest growth was in Dextrose (89.33mm), sporulation (17.67/10 μl) and least was in fructose (48.33mm), sporulation (1.33/10 μl). Among the Nitrogen sources used in media the growth and sporulation of the pathogen was highest in Potassium Nitrate (64.33mm and 11.33/10 μl respectively), and least was in ammonium nitrate (38.33mm growth and 1.33/10 μl sporulation respectively). Highest mycelium growth(89.00mm) and sporulation (17.33/10 μl) was obtained at 25˚C temperature and lowest was observed in 35 ˚C (8.00mm) and no sporulation occurred. Maximum hyphal growth was obtained in pH 6.0(89.00mm) and minimum was in pH 10(22.67mm). Highest number of blast lesion (12.00) was observed at 8 hours of leaf wetness in 25˚C and lowest number of lesion (0.33) was observed in 20˚C in two hours of leaf wetness. For the yield loss estimation different number of sprayings of Tricyclazole 75WP @0.1% were used and found that minimum PDI was recorded in staggered spraying i.e. 12.59% followed by 4 no. spraying (27.59%) at 75 DAT. The linear regression model showed that with every 1% increase in disease severity there is significant decrease in grain yield of 0.079 q/ha in pooled mean of both the years. To know about the effect of different date of transplanting on rice blast disease severity, three varieties (Satabdi, Khitish and Gontro Bidhan 3) were transplanted in three different date of transplanting (16th January,1st February and 15th February) in two places (Jaguli, Nadia and Jalangi, Murshidabad). In Jaguli the maximum PDI was recorded in the crop transplanted on 16th January (35.74%) and minimum in 15th February (27.09%) in pooled mean. Whereas, the minimum PDI was recorded in Khitish (18.45%) and maximum in Satabdi (47.22%) in pooled mean. In Jalangi, the maximum PDI was recorded in the crop transplanted on 16th (26.54%) and minimum in 1st February (D2) (20.86%) pooled mean. Whereas, the minimum PDI was recorded in Khitish (14.01%) and maximum in Satabdi (35.37%) in pooled mean. Among the diseases forecasting models i.e. observed, Gompertz and Logistic, Gormpertz fit better as compare to rest two irrespective of date of sowing and varieties, that was confirmed by highest R2 and low Standard error. To find out the eco-friendly and non-conventional way of rice blast disease development, bio control agents tested against Pyricularia grisea among which T.harzianum showed highest percentage of inhibition in Radial Growth (PIRG) (43.57%) at 96 hours after inoculation (hai) and the minimum PIRG was in case of Pseudomonas fluorescence (20.88%) at and 96 hai. Among the 50 varieties used for the screening of rice blast disease, 21 Varieties showed Resistance(R),16 were moderate resistant (MR),7 were moderately Susceptible (MS), 3 were Susceptible and only 3 were highly resistance nature (HR). The biochemical assay of three different rice varieties was done by the use of three different inducers viz. Salicylic Acid(SA), Jasmonic Acid(JA) and Benzothiadizole (BTH) as seed treatment under three different concentrations. It was observed that PAL activity reduced significantly in 48 hpi in comparison to 24 hpi and then gradually increased at 72 hpi irrespective of inducers and their doses. The PAL activity was highest in resistance variety Khitish and minimum in susceptible variety Satabdi. The POD activity was increased with the increase in time whereas in non- inoculated set in all cases the POD reduced at 48 hpi in comparison to 24 hpi and then gradually increased at 72 hpi. In field condition most effective treatment was Seed treatment with T.harzianum + Soil treatment with Bacillus subtilis with minimum PDI(19.44%), Whereas Soil treatment with Bacillus subtilis(T3) showed maximum PDI(39.25%) In the integrated approach of inducer and fungicide application, the highest PDI(38.70%) was recorded in Seedling treatment with BTH Whereas, the lowest PDI(23.15%) was recorded in Seedling treatment of SA+one spray of SA (tillering stage) +one spray of Tricyclazole 75WP@0.1% (boot leaf stage).ThesisItem Open Access Exploration of plant extracts against some plant pathogenic bacteria and diseases caused by them(Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, INDIA, Pin-741252, 2015-05-13) Anand, Yumlembam Rupert; Nath, P.S.Abstract not availableThesisItem Open Access Studies on the incidence and characterization of soybean infecting begomovirus in the plains of West Bengal(Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, INDIA, Pin-741252, 2014-02-25) Adhikary, Nayan Kishor; Tarafdar, JayantaAbstract not availableThesisItem Open Access Epidemiology and control of some whitefly transmitted virus diseases of pulses and vegetables in West Bengal(Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, INDIA, Pin-741252, 1989-12-27) Basu, Debasish; Mukhopadhyay, SankarAbstract not availableThesisItem Open Access Effects of epidemiological factors on the incidence of groundnut rust (Puccinia arachidis Speg.) in West Bengal(Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, INDIA, Pin-741252, 1991-12-31) Das, Srikanta; S. K., RajAbstract not availableThesisItem Open Access Some aspects of interaction of symbiotic and pathogenic microorganisms infecting legume hosts(Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, West Bengal, INDIA, Pin-741252, 1982-12-13) Bhattacharyya, Pranab Kumar; N., MukherjeeAbstract not available
