scholarly journals Significance of Sowing Dates and Meteorological Parameters on Severity of Stem Gall of Coriander Caused by Protomyces macrosporus

2021 ◽  
Author(s):  
S. Vijaykumar ◽  
Kushal Raj ◽  
Namita Soni
Keyword(s):  
Disease Severity ◽  
Meteorological Parameters ◽  
Winter Season ◽  
Quantitative Relationship ◽  
Plant Parts ◽  
Sowing Dates ◽  
Sunshine Hours ◽  
Stem Gall ◽  
Serious Disease ◽  
Cent Disease

Background: Coriander (Coriandrum sativum L.) belongs to family Apiaceae is generally grown in winter season as a main crop in India. Stem gall of coriander caused by Protomyces macrosporus L. is a serious disease damaging all aerial plant parts. Under favourable ecological conditions, the disease may lead losses to the extent of 100 per cent therefore it is necessary to investigate the epidemiology of the disease to devise suitable remedial measures Methods: The field experiment was conducted during Kharif season of 2018 with two varieties to study the effect of different meteorological parameters on stem gall of coriander at different sowing dates (1st week of November to 1st week of December). The stem gall severity was recorded at weekly intervals from the start of its incidence. Result: The disease severity was lowest (5.42%) in the variety DH-36 sown in 3rd week of November and maximum disease severity (11.88%) was observed in variety DH-228 sown in 1st week of December. The quantitative relationship between the disease severity and weather variables at different dates of sowing for two varieties was obtained by performing correlation analysis. The temperature (maximum and minimum) and sunshine hours had positive correlation with per cent disease intensity, while relative humidity (morning and evening) and remaining weather parameters were non-significant at each dates of sowing but correlated with the disease intensity.

scholarly journals Effect of temperature and moisture levels on disease development of stem gall of coriander

2019 ◽  
Vol 38 (4) ◽  
Author(s):  
Meenu Gupta ◽  
Munish Leharwan ◽  
Arti Shukla
Keyword(s):  
Soil Moisture ◽  
Disease Severity ◽  
Disease Incidence ◽  
Effect Of Temperature ◽  
Disease Development ◽  
High Soil Moisture ◽  
Moisture Regimes ◽  
Stem Gall ◽  
Cent Disease ◽  
Very High

Stem gall is one of the most important diseases of coriander. The effects of different temperature (15–35°C) and moisture levels (15-75 per cent) was studied on the development of stem gall of coriander caused by Protomyces macrosporus plants grown under controlled conditions. Results revealed that disease development was maximum (77.50%) at 25°C soil temperature followed by 30°C temperature giving 52.50 per cent disease incidence and 30.00 per cent disease severity, while very low and high temperature were not favourable for development of disease. In other experiment on different moisture regimes, 45 per cent of soil moisture level was favourable for disease development and resulted in 70.25 per cent disease incidence and 35.25 per cent disease severity. Very low and very high soil moisture levels were not favourable for disease development.

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 Influence of weather parameters on progress of rust disease severity in pea (Pisum sativum L.)

2017 ◽  
Vol 9 (3) ◽  
pp. 1724-1728
Author(s):  
Vinod Upadhyay ◽  
K. P. S. Kushwaha ◽  
Puja Pandey
Keyword(s):  
Relative Humidity ◽  
Disease Severity ◽  
Wind Velocity ◽  
Minimum Temperature ◽  
Meteorological Parameters ◽  
Maximum Temperature ◽  
Rust Disease ◽  
Rust Severity ◽  
Weather Parameters ◽  
Cent Disease

Decision to apply one or more fungicide spray will depend on the risk of rust epidemic in a particular year. Rust epidemic is determined by interaction of three important factors namely, susceptible host, virulent pathogen and the most important i.e. favourable environment for a particular period of time. Therefore, it is necessary to study the correlation between different meteorological parameters and rust severity. Present study revealed that rust dis-ease generally appeared 60 days after sowing and was subsequently increased with a period of time till harvest (4.17 to 64.17 per cent). Disease was observed at a maximum temperature of 16.85 to 24.79ᵒC, 8.09 to 12.27ᵒC minimum temperature, 90.30 to 95.70 percent morning Relative Humidity (RH), 54.80 to 78.40 percent afternoons RH, 0.10 to 5.45mm rainfall and wind velocity of 3.93 to 4.23 km/hr. The correlation between different meteorological parameters and rust severity revealed that per cent disease severity showed highly positive correlation with maxi-mum temperature (r = 0.977), minimum temperature (r = 0.704), rainfall (r = 0.039) and wind velocity(r = 0.093) whereas disease severity show negative correlation with morning(r=-0.925) and afternoon RH (r = -0.926). It was observed that the rust severity is highly influenced by the different weather parameters such as temperature, relative humidity, rainfall and wind velocity. This information will help the researchers in formulating the forecasting model for the rust disease in pea and will also supports farmers in decision making regarding time of occurrence of rust epi-demic and thereby, allow timely scheduling and need based utilization of fungicides accordingly for the management of pea rust.

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.

Impact of weather parameters on alternaria blight of Indian mustard [(Brassica juncea (L.) Czern. & Coss.)]

2021 ◽  
Vol 50 (1) ◽  
pp. 15-19
Author(s):  
Rakesh Punia ◽  
Pavitra Kumari ◽  
Anil Kumar ◽  
AS Rathi ◽  
Ram Avtar
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Disease Severity ◽  
Vapour Pressure ◽  
Minimum Temperature ◽  
Indian Mustard ◽  
Maximum Increase ◽  
Alternaria Blight ◽  
Progress Curve ◽  
Sunshine Hours

Progression of Alternaria blight disease was measured on two susceptible Indian mustard varieties viz., RH 30 and RH 0749 sown at three different dates. The maximum increase in disease severity was recorded between first weeks of February and last week of February. During this period, the maximum and minimum temperature, relative humidity at morning and evening, average vapour pressure of morning and evening, maximum and bright sunshine hours and wind speed were higher, which resulted in congenial conditions for severe infection by the pathogen. The disease severity was positively correlated with maximum and minimum temperature, average vapour pressure, wind speed, sunshine hours and evaporation, while relative humidity and rainfall negatively correlated with Alternaria blight on both the varieties. A maximum value of area under disease progress curve was observed on cultivar RH 30 (651.1 cm2) as compared to RH 0749 (578.9 cm2), when crop was sown on 9th November.

Multivariate analyses of indigenous bread wheat (Triticum aestivum L.) landraces of Oman

2021 ◽  
pp. 483
Author(s):  
Ali Hussain Al Lawati ◽  
Saleem Kaseemsaheb Nadaf ◽  
Nadiya Abubakar Al Saady ◽  
Saleh Ali Al Hinai ◽  
Almandhar Almamari ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Bread Wheat ◽  
Multivariate Analyses ◽  
Crop Improvement ◽  
Winter Season ◽  
Principal Component ◽  
Triticum Aestivum L ◽  
Plant Parts ◽  
Improvement Programs ◽  
D Values

Oman is endowed with enormous diversity of important food crops that have global significance for food security and has ancient history of cultivation of bread wheat (Triticum aestivum L.) with its divergent landraces, which are useful in crop improvement. 55 indigenous Omani accessions conserved at the USDA were evaluated in the winter season (November to April) of the years 2017-2018 and 2018-2019 on loamy soil under sprinklers in augmented design with 5 check varieties in 5 replications following crop husbandry practices as per national recommendations using 9 quantitative (descriptors) and 6 qualitative traits (anthocyanin pigmentation on plant parts). The data on traits were subjected not only for PC values and D values after varimax rotation through Kaiser normalization in Principal Component Analysis (PCA) but also for Agglomerative Hierarchical Clustering (AHC). The results indicated that indigenous bread wheat accessions were significantly different (p>0.05) for all the quantitative traits except number of tillers. The multivariate analyses led to formation of four diverse clusters from PCA analyses corresponding to four quadrants of bi-plot graphs and three clusters from AHC analysis corresponding to main clades of dendrogram. The parents were selected from common accessions of distinct clusters in all the multivariate analyses for hybridization for improving characters of growth for higher yield or productivity with pigmentation on one or two plant parts useful for DUS test of varieties. The indigenous bread wheat landraces / accessions were genetically diverse and have potential for use in national crop improvement programs for earliness and higher grain productivity with distinct identification markers.

scholarly journals Influence of weather parameters on alternaria leaf blight severity of makhana under the agro-climate of Koshi region of Bihar

2021 ◽  
Vol 23 (1) ◽  
pp. 54-59
Author(s):  
SANTOSH KUMAR ◽  
MD. NADEEM AKHTAR ◽  
SANTOSH KUMAR ◽  
MAHESH KUMAR ◽  
TRIBHUWAN KUMAR
Keyword(s):  
High Temperature ◽  
Relative Humidity ◽  
Disease Severity ◽  
Infection Process ◽  
Leaf Blight ◽  
Alternaria Leaf Blight ◽  
Weather Parameters ◽  
Maximum Temperatures ◽  
Blight Disease ◽  
Cent Disease

Weather parameters play a pivotal role in the infection process and spread of pathogen. It also influences the expression of susceptibility/resistance of the host plant during post-infection phases. Therefore, an experiment was conducted for two consecutive cropping seasons (2018 &2019) to study the influence of weather parameters such as temperature, humidity, rainfall and wind direction on the emergence of alternaria leaf blight of makhana in Koshi region of Bihar. Maximum per cent disease severity of alternarialeaf blightwas observed during the peak monsoon months (June to August). Highest disease severity of leaf blight (14.80% & 15.7%) was observed in the mid June during crop season, 2018 and 2019. High temperature (36.9oC & 38.1oC), and relative humidity (94% & 96.4%) of both the year 2018 and 2019 were found correlated with higher severity to alternaria leaf blight. Similarly average HTR values (3.1) were also found correlated with the average high temperature and relative humidity of both years (2018 and 2019) in terms of severity of leaf blight disease. Maximum temperatures, relative humidity and rainfall exhibited strong positive linear relationship and influenced the occurrence of alternaria leaf blight disease significantly. We also developed a geo-phytopathological model for the prediction of alternaria leaf blight disease of makhana on the basis of congenial mean temperature and relative humidity.

Survey on pomegranate anthracnose caused by Colletotrichum Gloeosporioides (Penz.) In Marathwada region

2017 ◽  
Author(s):  
Chavan A. A. ◽  
Dhutraj D. N.
Keyword(s):  
Disease Severity ◽  
Colletotrichum Gloeosporioides ◽  
Disease Incidence ◽  
Punica Granatum ◽  
Fungal Diseases ◽  
Point Scale ◽  
Disease Survey ◽  
Cropping Seasons ◽  
Cent Disease ◽  
Important Disease

Among fungal diseases anthracnose caused by Colleotrichum gloeosporioides is the most important disease. Survey of pomegranate (Punica granatum) orchards was conducted during 2013-14 in all the cropping seasons viz. mrig bahar, Hastabar and ambia bahar to assess the incidence and severity of anthracnose on pomegranate in Aurangabad, Jalna, Beed Osmanabad, Latur, Nanded, Hingoli and Parbhaani district of Marathwada region of Maharashtra state. The per cent disease incidence (PDI) and disease severity were recorded using 0-5 point scale. The maximum PDI on leaf was recorded in Hingoli (24.04%) followed by Nanded (22.62%) and Parbhani (22.22%) while least PDI recorded in Aurangabaad (15.09%). On fruit maximum PDI recorded in Parbhani (28.80%) which least in Beed district (19.02%). The 9.83 per cent disease variety on leaf was observed in Hingoli district and 10.70 per cent on fruit in Parbhani district. The maximum PDI (27.44%) on fruit and disease severity 12.45 per cent on fruit was recorded in Arakata. The maximum mean PDI 21.30 per cent on leaf and 25.85 per cent on fruit was recorded on trees aged above 5 years. The highest per cent disease incidence 25.34 per cent on leaf and 26.78 per cent on fruit was recorded on mrig bahar and the highest disease severity of leaf 10.05 per cent and fruit 11.22 per cent was reocrded in mrig bahar.

scholarly journals A study on fungicides potential and incidence of sheath rot of rice caused by Sarocladium oryzae (Sawada)

2013 ◽  
Vol 5 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Lalan Sharma ◽  
D. T. Nagrale ◽  
S. K. Singh ◽  
K. K. Sharma ◽  
A. P. Sinha
Keyword(s):  
Grain Yield ◽  
Disease Severity ◽  
Radial Growth ◽  
Foliar Spray ◽  
Climatic Conditions ◽  
Systemic Fungicides ◽  
Maximum Inhibition ◽  
Serious Disease ◽  
Type 3 ◽  
Sheath Rot

Sheath rot, Sarocdadium oryzae (Sawada) Gams. and Hawksw., has recently become a serious disease of rice when climatic conditions are unfavorable during flag sheath development. In this study systemic and nonsystemic fungicides were tested against S. oryzae. Maximum inhibition of radial growth (76.53%) was recorded at 10.0ppm of tebuconazole fungicides. In non-systemic fungicides, maximum inhibition of radial growth (78.86%) was recorded at 200.0ppm. Comparative efficacy of fungicides on sheath rot was tested during Kharif 2008-2009. Foliar spray of tebuconazole was found superior overall other treatments giving reduction in disease severity (59.01-64.33%), which was followed by followed by carbendazim (48.70-55.28%), and also increased grain yield per plant (45.06-65.84%), grain yield per plot (45.57-65.85%), 1000-grains weight (10.80-52.58%) and reduction in chaffiness (48.07-53.80%). Among non-systemic fungicides chorothalonil was found best in managing sheath rot, giving reduction in disease severity (35.68-38.85%), and also increased grain yield per plant (24.78-44.74%), grain yield per plot (24.52-44.57%), 1000-grains weight (4.25-35.47%) and reduction in chaffiness (15.74-45.96%) as compared to check. Another field experiment was conducted during Kharif 2009-10 to observe sheath rot incidence on rice cultivars in Tarai region. The incidence was recorded in thirty three varieties; only varieties (Type-3 and Basmati-370) were recorded as free from disease symptoms.

scholarly journals Influence of meteorological parameters on performance of rainfed cropping systems

MAUSAM ◽  
2022 ◽  
Vol 53 (4) ◽  
pp. 465-470
Author(s):  
A. KASHYAPI
Keyword(s):  
Field Experiments ◽  
Meteorological Parameters ◽  
Potential Evapotranspiration ◽  
Cropping Systems ◽  
Relative Yield ◽  
Residual Moisture ◽  
Sunshine Hours ◽  
Rice Yields ◽  
Direct Seeded ◽  
Very High

Rainfall, its distribution along with distribution of temperature. relative humidity (RH), bright sunshine hours (SSH) suggest the possible growing season and crop performance in a given area.  Field experiments on five economically feasible, sustainable, rainfed crop sequences viz. fallow (i.e. no crop) – rice-lentil,  jute-rice-lentil, direct seeded rice-rice-lentil, mungbean-rice-lentil and sesame-rice-lentil were conducted at Kalyani Farm, W.B., during 1989-91.  Mean monthly meteorological parameters viz. rainfall, potential evapotranspiration (PET), SSH, temperature (max. and min.) and RH (at 0700 and 1400 hrs LMT) were obtained from selected agrometeorological observatories (viz.  Chinsurah,  Haringhata and Barrackpore), adjacent to the Kalyani Farm located in Gangetic alluvial region.  The relative yield performance of crops and sequences as influenced by meteorological parameters were studied.  In Gangetic alluvial region early rain, moderate to high temperature with high RH during April/May resulted in good pre-kharif crop establishment.  Heavy, well distributed precipitation during monsoon months along with moderate temperature and very high RH showed scope for rainfed transplanted kharif rice as the pivot of crop rotation.  Kharif rice yields were high especially after jute or mungbean.  Profile stored residual moisture along with low rainfall, low temperature and high RH during rabi season resulted in good performance of lentil.  Among the five sequences studied, performance of' jute-rice-lentil and mungbean-rice-lentil were the best with sustainable production and net return.

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