scholarly journals Effect of seed treatment on seed borne fungi of rice

2016 ◽  
Vol 27 (1) ◽  
pp. 48-56
Author(s):  
L Naher ◽  
MA Ali ◽  
S Sheheli
Keyword(s):  
Seed Treatment ◽  
Disease Incidence ◽  
Rice Varieties ◽  
Control Seed ◽  
Remarkable Improvement ◽  
Seed Health ◽  
Plant Stand ◽  
Botanical Extracts ◽  
Seed Health Test ◽  
Health Test

Farmers of our country are not aware about seed treatment for controlling seed borne fungi. Seeds of 3 rice varieties viz. BR11, BRRI dhan30 and BRRI dhan33 were collected from farmers houses of Gopalpur, Tangail. Three seed treating fungicides viz. vitavax 200 vitavax 200 (0.25%), thiovit (0.25%) and cupravit (0.25%) were used. Collected seed samples were tested by dry inspection and blotter method. The highest and the lowest germination were recorded in seed samples of BRRI dhan30 (90%) and BRRI dhan33 (75%). After seed treatment the highest and the lowest germination were recorded in seed samples of BRRIdhan30, BRRI dhan33 (100) treated by vitavax 200 (0.25%) and BR11 (80%) in control. Seed health test by blotter method revealed seed borne fungi belonging to six genera viz. Bipolarisoryzae (2.5 to 8.53%), Alternariapadwickii (5.3 to 13.35%), Fusariummoniliforme (11.66 to 21.67%), Fusariumoxysporum (1.25 to 4.35%), Curvularialunata (1.95 to 7.5%) and Aspergillusspp (1.75 to 6.54%) were encountered. Bur after seed treatment remarkable improvement viz. Bipolarisoryzae (0.15 to 3.75%), Alternariapadwickii (0.0 to 3.0%), Fusariummoniliforme (2.16 to 5.83%), Fusariumoxysporum (0.0 to 3.0%), Curvulariaunata (0.0 to 2.56%) and Aspergillusspp (0.0 to 1.5%) were encountered. Vitavax 200 was found most effective against the seed borne pathogens of rice. Nowadays, many botanical extracts such as neem, nishinda, garlic, alamonda and biological agent such as Trichoderma also using as seed treating agent and resulted significant higher germination and plant stand, less disease incidence and higher yield of different crops. So, the farmers should treat their seed before sowing in their field and through this technique they will be more benefited.Progressive Agriculture 27 (1): 48-56, 2016

scholarly journals Ability of an ELISA-Based Seed Health Test to Detect Erwinia stewartii in Maize Seed Treated with Fungicides and Insecticides

Plant Disease ◽  
2004 ◽  
Vol 88 (6) ◽  
pp. 633-640 ◽  
Author(s):  
J. K. Pataky ◽  
C. C. Block ◽  
P. M. Michener ◽  
L. M. Shepherd ◽  
D. C. McGee ◽  
...  
Keyword(s):  
Seed Treatment ◽  
Type I Error ◽  
Enzyme Linked Immunosorbent Assay ◽  
Type I ◽  
Maize Seed ◽  
Seed Treatments ◽  
Seed Health ◽  
Erwinia Stewartii ◽  
Seed Health Test ◽  
Health Test

Two sets of experiments were done to examine whether seed-treatment chemicals affected the ability of an enzyme-linked immunosorbent assay (ELISA)-based seed health test to detect Erwinia stewartii. The chemicals evaluated included Actellic, Apron, Captan, Cruiser, Gaucho, Maxim, Poncho, Thiram, and Vitavax in 11 seed-treatment combinations. In one experiment, seed-treatment chemicals were evaluated quantitatively in a critical region of ELISA absorbance values near 0.5 using maize seed that were spiked with uniform quantities of a liquid suspension of E. stewartii. The number of bacteria in each sample was estimated from ELISA absorbance values using standard curves. Log CFU of E. stewartii per sample were not significantly different among the untreated control and the 11 seed treatments compared with Tukey's Studentized Range Test (P = 0.05). Means of log CFU/ml for all treatments were tightly clustered around 5.70 which corresponded to an absorbance value of 0.440 and a bacterial population of about 500,000 CFU/ml. In a second set of experiments, seed treatment chemicals were evaluated based on qualitative decisions that resulted from the ELISA-based seed health test of seed lots of Jubilee and A632 infected with E. stewartii. The number of negative samples was not substantially greater than expected based on binomial probabilities except for samples of Captan/Vitavax-treated A632, which we considered to be a type I error. The mean absorbance values of positive samples ranged from 1.42 to 1.72 for A632 and from 1.51 to 1.91 for Jubilee and did not differ significantly among the seed treatments. There was no consistent evidence from these experiments that fungicide or insecticide seed treatments interfered with the sensitivity of the ELISA or altered low (e.g., 0.5) or high (e.g. 1.4 to 1.9) absorbance values. The ability of the ELISA-based seed health test to detect E. stewartii in maize seed was not affected by these seed treatments.

scholarly journals Effect of Seed Category as Affected by Bipolaris sorokiniana on the Germination of Wheat Seeds

2012 ◽  
Vol 5 (1) ◽  
pp. 113-116
Author(s):  
A Sultana ◽  
AQMB Rashid
Keyword(s):  
Natural Resources ◽  
Seed Treatment ◽  
Bipolaris Sorokiniana ◽  
Wheat Seed ◽  
Seed Pathology ◽  
Seed Health ◽  
Seed Health Test ◽  
Health Test ◽  
Wheat Seeds

An experiment was conducted under in-vitro condition to determine the effect of wheat seed categories such as healthy looking, blackpointed and shriveled as affected by Bipolaris sorokiniana on the germination of wheat seeds. The work was done in the   laboratory of Seed Pathology Center, Bangladesh Agricultural University, Mymensingh during 2010-11. The highest prevalence   65%) of B. sorokiniana was recorded in shriveled seeds, (42%) was recorded in blackpointed seeds, and (30%) was associated  with healthy looking seeds. The pathogen was responsible for the highest germination failure (87%) found in the category of   shriveled seeds and then (35%) was found in blackpointed seeds while the healthy looking seeds showed (24%) germination  failure. The result suggests that, the shriveled and blackpointed seed samples must be rejected, and after proper seed health test in an only the healthy looking seeds may be recommended for sowing through proper seed treatment. DOI: http://dx.doi.org/10.3329/jesnr.v5i1.11563 J. Environ. Sci. & Natural Resources, 5(1): 113 - 116, 2012

scholarly journals Identification of seed-borne fungi of farmer-saved seeds of pepper and their control with some selected botanicals

2020 ◽  
Vol 55 (1) ◽  
pp. 43-53
Author(s):  
E. Gyasi ◽  
C. Kwoseh ◽  
E. Moses
Keyword(s):  
Aqueous Extract ◽  
Neem Extract ◽  
Treatment Practice ◽  
Seed Health ◽  
Botanical Extracts ◽  
Seed Health Test ◽  
Planting Materials ◽  
Health Test ◽  
Pepper Seed

A survey was conducted on the source of planting materials and pre-planting seed treatment practice by pepper farmers in Obenemasi and Ofoase-Kokoben communities in the Ashanti Region of Ghana using a well-structured questionnaire in June, 2011. Seed health test was conducted on 40 farmer-saved pepper seed samples collected from the farmers interviewed using the blotter method in the laboratory. Efficacy of garlic, ginger and neem botanical extracts in managing the seed-borne fungi of pepper seeds was also investigated in this study in-vitro. Results of the questionnaire-based survey indicated that, majority of respondent farmers, about 75% recycled seeds from previous harvest, 20% of respondents also used seeds obtained from friends and 5% obtained their pepper seeds from local markets. Nine genera of fungi including 12 species were identified from the pepper seed samples collected. The three botanical extracts proved effective as Mancozeb in controlling one or more of the test seed-borne fungi. Garlic aqueous extract (60% (w/v)) was effective as Mancozeb in controlling Colletotrichum capsici and Colletotrichum gloesporioides. Ginger aqueous extract (60% (w/v)) was also effective against seed-borne Fusarium and Aspergillus spp. whereas aqueous neem extract (60% (w/v)) was effective in controlling Aspergillus flavus and Aspergillus niger.

scholarly journals PHYSIOLOGICAL AND SANITARY QUALITY OF DESICCATED AND STORED AZUKI BEAN SEEDS

2016 ◽  
Vol 29 (1) ◽  
pp. 66-75 ◽  
Author(s):  
CÁSSIO JARDIM TAVARES ◽  
PATRÍCIA CARDOSO FERREIRA ◽  
ADRIANO JAKELAITIS ◽  
JULIANA DE FÁTIMA SALES ◽  
OSVALDO RESENDE
Keyword(s):  
Seed Quality ◽  
Block Design ◽  
Azuki Bean ◽  
Herbicide Application ◽  
Seed Health ◽  
Randomized Complete Block Design ◽  
Physiological Quality ◽  
Seed Health Test ◽  
Health Test

ABSTRACT: The objective of this research was to evaluate the effects of using different herbicides as desiccants in pre-harvest and the effects of storage on the physiological and sanitary quality of azuki bean seeds (Vigna angularis Willd). The experiment was arranged in a randomized complete block design in a split plot scheme, with four replications. Four herbicides were tested: paraquat (400 g a.i. ha-1), glufosinate ammonium (400 g a.i. ha-1), glyphosate (720 g a.i. ha-1), flumioxazin (30 g a.i. ha-1) and a control without herbicide application. In the subplots seed quality was tested in two evaluation periods: at harvest and six months after harvest. Desiccant was applied when the azuki beans were physiologically mature. We assessed the physiological and sanitary quality of the seeds using a vigour and seed health test. The use of glyphosate resulted in a higher incidence of abnormal seedlings and reduced size and weight of the seedlings. With paraquat and flumioxazin the physiological quality was maintained and there was reduced pathogen infestation in the seeds six months after harvest. Storage affected the physiological quality of the azuki bean seeds.

scholarly journals Efficacy of Fungicide Seed Treatments in Controlling Blackleg of Canola

2019 ◽  
Vol 20 (3) ◽  
pp. 160-164
Author(s):  
Sudha GC Upadhaya ◽  
Venkataramana Chapara ◽  
Mukhlesur Rahman ◽  
Luis E. del Río Mendoza
Keyword(s):  
Seed Treatment ◽  
Leaf Growth ◽  
Disease Incidence ◽  
Leptosphaeria Maculans ◽  
Field Trials ◽  
Management Tool ◽  
Blackleg Disease ◽  
Seed Treatments ◽  
Spring Canola ◽  
Plant Stand

The efficacy of five fungicide seed treatments as a management tool against blackleg on spring canola was evaluated under greenhouse and field conditions in North Dakota. Blackleg, caused by Leptosphaeria maculans, inflicts the greatest yield losses when infecting seedlings before they reach the six-leaf growth stage. In greenhouse studies, 10-day-old seedlings were inoculated with L. maculans spore suspensions and evaluated 12 days later and at maturity or inoculated 12, 20, or 28 days after planting and evaluated at maturity. In field trials conducted in 2017 and 2018, severity was assessed at maturity. In the greenhouse, all fungicide seed treatments reduced (P = 0.05) disease severity at the seedling stage, but only the protection provided by Obvius (fluxapyroxad + pyraclostrobin + metalaxyl) and Helix Vibrance (mefenoxam + fludioxonil + sedaxane + difenoconazole + thiamethoxam) reduced (P < 0.05) severity at the adult stage; however, none of them provide effective protection when plants were inoculated 20 days after planting or later. In field trials, none of the treatments significantly (P > 0.05) improved plant stand and yield or reduced disease incidence and severity. Although fungicide seed treatment is a valuable tool, it should not be used as the only method to manage blackleg disease.

New Zealand's seed health

2010 ◽  
Vol 14 ◽  
pp. 93-100
Author(s):  
J.G. Hampton
Keyword(s):  
New Zealand ◽  
Health Status ◽  
Seed Treatment ◽  
Crop Management ◽  
Fusarium Spp ◽  
Control Seed ◽  
Plant Pests ◽  
Seed Pathology ◽  
Seed Health ◽  
History Of

Seed pathology, which has at least a 120- year history in New Zealand, began with experiments for the control of cereal smuts. A brief history of seed pathology in New Zealand for the eras pre-1930, 1930-1960, 1960-1980, 1980-2000 is presented. New Zealand seed pathology has concentrated on diseases of the Poaceae and large-seeded legumes. Little is known of the occurrence or significance of seed-borne pathogens of other species, particularly vegetables. The New Zealand seed trade has for many years relied on fungicide seed treatment to control seed-borne pathogens of cereals, peas and brassicas, but currently there are problems with Fusarium spp. in cereals. New Zealand, as a biosecurity conscious nation, has strict measures in place to prevent the unwanted introduction of new plant pests. These requirements are briefly discussed. However seed health testing is carried out routinely only for seed lots requiring evidence of freedom from seed-borne pathogens for export phytosanitary requirements. In many cases knowledge of the health status of seed lots sown in New Zealand would enable better informed crop management decisions. Keywords: seed-borne diseases, seed pathology, seed health testing, seed treatment

scholarly journals Control of seed borne fungi on tomato seeds and their management by botanical extracts

2016 ◽  
Vol 3 (3) ◽  
pp. 403-410 ◽  
Author(s):  
Imam Mehedi ◽  
Afia Sultana ◽  
Md Amanut Ullah Raju
Keyword(s):  
Fungal Species ◽  
Leaf Extracts ◽  
Tomato Seeds ◽  
Seed Health ◽  
The Status ◽  
Significant Performance ◽  
Seed Health Test ◽  
Aspergillus Sp ◽  
Health Test ◽  
Different Doses

Seed health test was done in laboratory to determine the status of seed borne fungi on seeds of five tomato (Lycopersicon esculentum) varieties viz. Manik, Ratan, Roma VF, Kopotakkho and Monirumpuri and their possible control by using plant extracts. A total of 4 genera of 3 species of fungi were recorded where Fusarium oxysporum was the most prevalent and predominant seed borne fungus (25.60%). Other three fungal species are Aspergillus sp. of Aspergillus flavus (21.70%) and Aspergillus niger (11.11%) and Cladosporium sp. (13.49%). Tomato seeds were treated with different plant leaf extracts namely Mahogany, Mehendi and Allamanda with different doses viz. 1:1, 1:2 and 1:3 to control the seed borne fungi. In treated seeds, germination was ranged from 72-82% which was 68% in controlled condition. Among the doses of three botanicals, Mahogany, Mehendi and Allamonda extract @ (1:1 w/v) showed significant performance in controlling seed borne fungi and germination of tomato seeds. Among the three botanicals, Mahogany @ (1:1 w/v) was found the best treatment regarding percent reduction of seed borne infection.Res. Agric., Livest. Fish.3(3): 403-410, December 2016

Comparison of Seed Transmission and Survival of Xanthomonas axonopodis pv. phaseoli and Xanthomonas fuscans subsp. fuscans in Common Bean Seeds

2013 ◽  
Vol 14 (1) ◽  
pp. 41 ◽  
Author(s):  
Y. He ◽  
G. P. Munkvold
Keyword(s):  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Bacterial Blight ◽  
Disease Incidence ◽  
Seed Transmission ◽  
Common Bacterial Blight ◽  
Phaseolus Vulgaris L ◽  
Transmission Frequency ◽  
Xanthomonas Axonopodis ◽  
Seed Health

Xanthomonas axonopodis pv. phaseoli (Smith) Vauterin (Xap) and Xanthomonas fuscans subsp. fuscans Schaad et al. (Xff) cause indistinguishable symptoms known as common bacterial blight of bean (Phaseolus vulgaris L.). These results confirm a higher disease incidence and seed transmission frequency of Xff compared to Xap and reinforce the need for seed health tests that can differentiate the two species. Accepted for publication 21 August 2013. Published 23 September 2013.

scholarly journals Temperature, Moisture, and Seed Treatment Effects on Rhizoctonia solani Root Rot of Soybean

Plant Disease ◽  
2003 ◽  
Vol 87 (5) ◽  
pp. 533-538 ◽  
Author(s):  
A. E. Dorrance ◽  
M. D. Kleinhenz ◽  
S. A. McClure ◽  
N. T. Tuttle
Keyword(s):  
Soil Moisture ◽  
Rhizoctonia Solani ◽  
Root Rot ◽  
Seed Treatment ◽  
Anastomosis Group ◽  
Control Measures ◽  
Root Weight ◽  
Wide Range ◽  
Plant Stand ◽  
Growth Chamber Studies

The effects of temperature and soil moisture on infection and disease development by Rhizoctonia solani on soybean were studied individually. In addition, the anastomosis group of R. solani isolates recovered from soybean from 35 fields in 15 counties was determined. All of the 44 isolates recovered in this study were AG-2-2 IIIB. Five isolates of R. solani were able to infect and colonize soybean roots and hypocotyls at 20, 24, 28, and 32°C in growth chamber studies. The temperatures evaluated in this study were not limiting to the isolates tested. In greenhouse studies, nine R. solani isolates and a noninoculated control were evaluated at 25, 50, 75, and 100% soil moisture holding capacity (MHC). Root weights were greater and percent stand averages higher at 50 and 75% than at 25 or 100% MHC; however, as percentage of control, the main effect on percent moisture for percent stand, plant height, or root weight was not significant. There were significant differences among the isolates for the percent stand, root rot rating, and root fresh weight of soybean in each study. In both temperature and moisture studies, the R. solani isolates could be separated as predominantly causing (i) seed rot, as detected by greatly reduced plant stand; (ii) root rot generally having no effect on plant stand but a high root rot rating and low root weight; or (iii) hypocotyl lesions, having no effect on plant stand, a low root rot score, and a high number of red lesions on the hypocotyl. In the greenhouse seed treatment evaluations of five fungicides, there was no fungicide by isolate interaction using these pathogenic types of R. solani. None of the seed treatments evaluated in this study provided 100% control of the four isolates tested. Due to the wide range of environmental factors that permit R. solani infection and disease on soybeans, other control measures that last all season, such as host resistance, should be emphasized.

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