Mohammad Ansar

• PhD
• Professor (Assistant) at Bihar Agricultural University

In the original publication [...]

Papaya ringspot virus (PRSV), which is transmitted by aphids, is considered to be the major virus infecting papaya and cucurbits worldwide. In this study, we detected the virus and other associated pathogen complexities in papaya and cucurbits through polymerase chain reaction (PCR) assay. In one step reverse transcription (RT)-PCR tests, primarily...

Genome packaging is the crucial step for maturation of plant viruses containing an RNA genome. Viruses exhibit a remarkable degree of packaging specificity, despite the probability of co-packaging cellular RNAs. Three different types of viral genome packaging systems are reported so far. The recently upgraded type I genome packaging system involves...

Brinjal (Solanum melongena L) is one of the most common vegetable crops grown in tropical & subtropical regions of the world. Brinjal cultivation is affected by various pest and diseases. The soil borne diseases like fungal and bacterial wilt are the most destructive diseases of brinjal. These are caused by Fusarium oxysporum f.sp. melongenae Schle...

Maize is considered the third most important cereal crop in Asia after rice and wheat. Many diseases affect this crop due to the cultivation of various hybrids. This research aimed to characterize the causative agent of northern corn leaf blight disease in Bihar, India, caused by Ex-serohilum turcicum (Passerini) Leonard and Suggs. Leaf samples wer...

Geminiviruses infect many crop plants, and are limiting factors for veg-etable crop production. Begomoviruses (Geminiviridae) cause typical symptoms of leaf curling and puckering in nightshade (Solanum nigrum), a seasonal weed in Bihar, India. To investigate if nightshade was an intermediate host for begomo-virus, virus DNA was extracted and charac...

Viruses cause many severe plant diseases, resulting in immense losses of crop yield worldwide. Therefore, developing novel approaches to control plant viruses is crucial to meet the demands of a growing world population. Recently, RNA interference (RNAi) has been widely used to develop virus-resistant plants. Once genome replication and assembly of...

The experimental research work was designed to detect garlic bulb associated viruses through RT- PCR and to evaluate the response of genotypes against viruses under field condition. The explored finding will be supportive to consider the viral association with garlic bulbs and their transmission.

Objective: The Potato Leaf Roll Virus (PLRV) is one of the most devastating virus causing severe yield losses worldwide in potato. The comprehensive observations were made to study the PLRV infestation in major potato growing areas of Bihar (India) and further detailed molecular basis of PLRV aggravation was established. Results: Although aphids po...

During 2016-2017 in Bhagalpur, Bihar, northern India, French bean plants developed curling and yellow mosaic of leaves and stunting. In eight of 12 symptomatic plants, PCR tests for Mungbean yellow mosaic India virus were positive. In the four PCR-negative symptomatic plants, rolling circle amplification (RCA) detected a ~ 2.7-kb DNA that was ident...

Polerovirus (Family-Luteoviridae) are one of the most destructive viruses causing detrimental diseases in vegetable crops in tropical regions of the world including India. Four species viz. potato leaf roll virus (PLRV), potato virus Y(PVY), potato virus X(PVX) and potato virus S(PVS) are known to cause different diseases in potato crops. Of the va...

The severe mosaic and mild leaf curl symptoms were observed on tomato crops in the agricultural farm at Chitrakoot, Madhya Pradesh, India. Based on typical viral symptoms and high populations of whiteflies in the field, the association of begomovirus was suspected. The identification of a bipartite begomovirus associated with the disease was perfor...

Ecology, disease mechanism, and management of vegetable diseases are dealt here.

Diseases caused by begomoviruses are an emerging threat to many crops in tropical and sub-tropical regions of the world. Leaf curl of chili is one of the most destructive disease induced by begomoviruses causing substantial losses. Leaf curling, puckering and stunted growth of the plants are typical symptoms of leaf curl disease in chili and also i...

Tomato leaf curl disease (ToLCD) affected 25% of the tomato crop in Chitrakoot, India and symptomatic leaves were collected for molecular assay. The complete sequences of bipartite begomovirus DNA-A and a betasatellite DNA were amplified. In a sequence analysis, begomovirus DNA-A and betasatellite shared highest sequence identity (91–99%) with Toma...

The dark spot pathogen of cauliflower, Alternaria brassicae, is a common problem in eastern and north-east Bihar. Occurrence of this disease is repeatedly observed in crucifers of this region. The disease is more severe in those areas where seed production of crucifers is practiced. Therefore, we designed this experiment including the natural occur...

Stem necrosis inflicts severe loss of early grown potato (Solanum tuberosum L.) in central and western part of India. The disease is caused by Groundnut Bud Necrosis Virus (GBNV). The identity o the virus detected through reverse transcriptase-PCR using specific primers targeting nucleocapsid protein gene of GBNV yielded a single band of ~800bp....

In a comprehensive study, the survillance of potato viral diseases in seed production plots was done using immuno-dipsticks detection technique at Tarai region of Uttarakhand. Assorted range of over laping symptoms incited by different viruses exhibited independently and/ or in combination. The common symptoms observed were, fiant mottle, mild and...

A field experiment was conducted for two consecutive years to evaluate resistance in chickpea genotypes against dry root rot and stunt virus. Total one hundred and fifty one (151) genotypes were evaluated against dry root rot in which only JG315 showed resistant reaction. Based on the pooled incidence data of two year experiment one hundred twenty...

Plant pathology is an exciting area of plant science, creating unprecedented opportunities for research. It has been found that several plant pathogens have emerged due to a changed climatic scenario and are causing severe damage to plants compared with earlier records. So often new phytopathogens emerge and appear primarily in acute form and then...

Several questions remain unanswered on escape mechanism of lentil against Fusarium wilt caused by Fusarium oxysporum f. sp. Lentis. Consequently, this study was designed with few parameters including inoculum density, temporal sowing (associated with soil temperature) and its thermal effect with the pathogen. Increased amount of inoculum resulted h...

Field experiments were carried out in order to determine the efficacy of traditional and new fungicides for preharvest and postharvest management to late blight disease of tomato. Preharvest management was followed by application of traditional fungicide and combination of fungicides. The combination of Mancozeb with Cymoxanil and Mancozeb with Phe...

Stem necrosis disease causes serious reductions in tuber yield of potato (Solanum tuberosum L.). The causal agent of this disease is Groundnut bud necrosis virus (GBNV, genus Tospovirus). It is effectively transmitted by mechanical sap and insect vector, thrips (Thrips palmi) inoculation. Association of the GBNV with infected experimental potato ho...

The experiment was made to investigate the yellow vein mosaic disease epidemiology in okra crop under natural condition. In multiple linear regression equation, population of whiteflies decreases by increase of maximum temperature. Coefficient of multiple determinations R 2 value (0.970) represents that 97% influence in the population of whiteflies...

All five isolates were found morphologically different and mycelial growth in different media was observed. Isolate Foc-5 preferred Czapek Dox medium for maximum growth (78.5 mm) while poor growth of Foc-4 (53.1 mm) in Asthan and Howkers medium. Isolate Foc-1 produced white dull colony whereas Foc-2 and Foc-4 rendered brown and pinkish white colony...