Mohankumar Subbarayalu

Mohankumar Subbarayalu
Tamil Nadu Agricultural University | TNAU · Department of Plant Biotechnology

Doctor of Philosophy in Agricultural Entomology

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179
Publications
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Publications

Publications (179)
Article
Full-text available
Insect pollinators are essential not only for enhanced food production but also play a major role in improving the quality produces. Various threatening agricultural practices decline the pollinators and the service they provide. The current study was designed to record different insect pollinators, their abundance and plant-pollinator interaction...
Article
Full-text available
The fall armyworm (FAW), Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is an invasive insect pest of India native to the Western Hemisphere. The pest damages more than 350 plant species. FAW is genetically divided into two strains viz. corn (C) strain which feeds mostly on maize, sorghum, etc. and the other is a rice (R) strain that...
Article
Cucumber mosaic virus (CMV) has broad host range by infecting major stable food crops and causes heavy loss especially in brinjal. In major brinjal growing tracts of Tamil Nadu, Krishnagiri recorded the highest combined infection of CMV and Candidatus Phytoplasma australasia (Ca. P. australasia) with 26%. The symptoms ranged from mild to severe mos...
Article
Clearwing tussock moths were collected from different parts of Tamil Nadu, India. The occurrence of Perina nuda (F.) has been documented with morphological studies. Male moths bear no resemblance to females, with almost hyaline forewing and hind wings drab grey to pale purplish grey with a hyaline patch at the apical angle of the hind wing. Females...
Article
Brinjal is the most important vegetable crop cultivated in both tropical and sub-tropical regions due to its high adaptability and the prevailing demand for edible purpose. Brinjal crop expressing viral disease like symptoms viz., mosaic, severe mosaic, vein banding, blistering, stunting were collected. The weed plants in brinjal ecosystem viz., Eu...
Article
Full-text available
In the present study, molecular characterization was carried out at the Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore to identify the strains of fall armyworm collected from pearl millet crop at four different locations in Tamil Nadu, India. PCR-RFLP profile of mitochondrial COI fragment exhibited the presence of...
Article
Rice weevil Sitophilus oryzae (L.) is one of most serious insect pests of stored grains. Management of this is thus vital and fumigation with phosphine gas is the most common method. However, overreliance on this has resulted in the development of heritable resistance in S. oryzae. The detection of frequency and distribution of phosphine resistance...
Article
Full-text available
In the wake of invasive species and climate change, sub-family Lymantriinae a neglected group was chosen to evaluate and consider as bio-indicator of the disturbed ecosystem with anthropogenic activities. In the present study, moth collections were carried out through a light trap in the plains at the foot hills of the Nilgiris and hilly regions of...
Book
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Book of Abstracts: International conference on Ag’Omics-2021 (Agricultural Genomics: Progress and Prospects) Oct.21st to Oct.23rd, 2021.
Article
Sixteen rice accessions were screened under greenhouse condition and field condition against yellow stem borer (YSB) during 2014-15. Six wild accessions were screened against YSB under green house condition only. In green house condition, the accessions viz., Oryza minuta, O. nivara, IR 20, IET 23710 and IET 23715 recorded the score of 3 (moderatel...
Poster
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Genus Psalis comprise four species viz., P. africana, P. kanshireiensis, P. pennatula and P. punctuligera which are almost identical (Kiriakoff, 1956). • Of these, Psalis pennatula is the only documented species as pest on rice in India (Nair, 1975). Methodology • Adult moths of Psalis sp. were collected from different rice growing regions of Tamil...
Article
Full-text available
Severe Acute Respiratory Syndrome Corona Virus 2 (SARS-CoV-2) being a causative agent for global pandemic disease nCOVID’19, has acquired much scientific attention for the development of effective vaccines and drugs. Several attempts have been made to explore repurposing existing drugs known for their anti-viral activities, and test the traditional...
Conference Paper
Full-text available
Chrysanthemum is ravaged by numerous agromyzid leafminers. Of which, Chromatomyia syngenesiae Hardy (Diptera: Agromyzidae) is an invasive polyphagous leafminer which causes heavy infestation by mining the green leaf tissue and weakens the plant by reducing the photosyn-thetic activity that results in unmarketable flowers. Hitherto, no further infor...
Article
In the present investigation, hyperparasitic interaction between B. bassiana, TM (MH590235) and P. xylostella was studied through scanning electron microscopy and chromatographic techniques. Dose–mortality responses showed an increase in mortality of larva with an increase in spore concentration. The LC50 value for B. bassiana isolate TM (MH590235)...
Article
BACKGROUND The rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae) is a cosmopolitan pest of stored cereal grains and other commodities globally. Infestations caused by S. oryzae makes grains unsuitable for consumption, processing, and export. Deltamethrin, a synthetic pyrethroid insecticide, is widely used in major grain storages in In...
Conference Paper
Diamondback moth is one of the most important destructive pests attacking Brassica vegetable crops across the globe. With repeated notification of resistance of P. xylostella to different group of insecticides from many countries, microbial biopesticides are considered as an effective alternative. Bacillus thuringiensis (Bt) constitutes the active...
Article
The hemipteran pest silverleaf whitefly, Bemisia tabaci (Gennadius) (Aleyrodidae), is of high economic importance, as it infests a wide range of agricultural and horticultural crops. The pest is regarded as a cryptic species complex. In the present study, the cryptic species composition and viruliferous status of B. tabaci in association with yello...
Article
Full-text available
Lablab (Lablab purpureus L.) and green gram (Vigna radiata L.) are attacked by a wide range of insect pests among which legume pod borer Maruca vitrata (F.) does extensive damage during flowering and pod formation stages. Identification of promising biorational materials can lead to developing IPM. Field experiments were conducted on lablab var. Co...
Chapter
Bacillus thuringiensis (Bt) is an omnipresent, spore-forming soil bacterium that is distinguished by the production of proteins, which are active on a wide range of insect pests. The potential of Bt to be utilized as an insecticidal spray was perceived in the mid-twentieth century and since that time numerous Bt-based biopesticides have been market...
Article
Full-text available
Eriophyoid mites (Acari: Prostigmata) are the most diverse group and certain species are economically important due to their damage potential. These mites are the most highly adapted plant feeding fauna evolved in intimate association with their host plants. The host-specific factors of the eriophyoids limit their niche exploitation and promote rap...
Article
Resistant mechanisms viz., antixenosis, antibiosis, and tolerance of six cotton genotypes were evaluated under free-choice and no-choice conditions against Bemisia tabaci Asia-II-8. Results showed that the whiteflies select the host for oviposition after initial probing. The genotypes LRA-5166 and LHDP-1 was least preferred for oviposition under fr...
Chapter
Full-text available
Studies on genetics and genomics of productive insects, particularly honeybee species, are crucial for understanding the evolutionary dynamics and genetic basis of variability in life history traits. Genetics and genomics of the dwarf honeybee, Apis florae Fabricus, in relation to chromosome details and their arrangements, and similarity with the o...
Preprint
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Severe Acute Respiratory Syndrome Corona Virus 2 (SARS-CoV-2) declared as a pandemic by WHO that has affected more than 40 lakh peoples and caused death of more than 2 lakh individuals across the globe. Limited availability of genomic information of SARS-CoV-2 and non-availability of vaccines and effective drugs are major problems responsible for t...
Article
Entomopathogenic fungi are known to produce a multitude of low molecular weight secondary metabolites involved in different biological processes including fungal development, intercellular communication and interaction with other organisms in complex niches. In the present investigation, heterogeneity in metabolome profile of three isolates of Beau...
Article
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RNA interference (RNAi) is a sequence-specific down-regulation in the expression of a particular gene, induced by double-stranded RNA (dsRNA). Feeding of dsRNA either directly or through transgenic plants expressing dsRNA of insect genes has been proven successful against lepidopteran and coleopteran pests, establishing an additional alternative to...
Article
The shoot fly resistance in sorghum appears to be a complex trait and depends upon the interaction of a number of component characters, which finally sum up in the expression of shoot fly resistance. The present study was conducted during Summer-2019 to assess the correlation and study the relationship of different plant characters with shoot fly r...
Article
Full-text available
The present study was carried out to analyze and determine the component traits having strong association with shoot fly resistance and true contribution or mutual relationship toward the grain yield in sorghum. Sorghum RILs population, 110 lines were evaluated and the field experiment was conducted during Kharif season. Grain yield per plant recor...
Article
Tobacco streak virus incidence in the cotton field, cv CO14 at Department of Cotton, Tamil Nadu Agricultural University (TNAU), Coimbatore, India was nearly 36.50%. Cotton plants infected with TSV exhibits different types of symptoms, including necrotic spots, lesions, mosaic, purplish necrotic rings, square drying, veinal necrosis and drying of te...
Poster
Full-text available
Parasitic potential of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) against Fall armyworm Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae)
Article
Full-text available
Microplot field trial was conducted from March to May 2017 to assess the efficacy of various biopesticides, pathogen, predator and parasitoid against M. vitrata on lablab (var. Co Gb 14). The experiments were carried out in a randomized block design (RBD) with nine treatments and three replications. Results revealed that spinosad 45% SC @ 75 ml ha-...
Article
Full-text available
Efficacy of Entomopathogenic Fungi, Beauveria bassiana against Maruca vitrata (Geyer) under Laboratory Condition
Book
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Tamil Nadu Agricultural University is hosting the TNAU-CORTEVA Plant Science Symposium series on “Crop Genomics and Data Science: Challenges and Opportunities” during October 17-18, 2019. TNAU a traditionally rich with 100-year academic excellence joining hands with CORTEVA AgriSciences is organizing this event at cotton city of Coimbatore. TNAU-CO...
Article
Full-text available
The resistance of okra genotypes against leafhopper, Amrasca biguttula biguttula Ishida was investigated under field condition following recording of leafhop-per population, trichome density per cm 2 of leaf and trichome length on midrib, veins, leaf lamina of adax-ial and abaxial surface of leaves. The results indicate that genotype AE 65 had more...
Article
The studies with SEM clearly depicted that the antenna of female was longer than male antenna. Five types of sensilla namely trichodea, chaetica, styloconica, coeloconica and auricillica, and scales were observed on the flagellum of both sexes. Sensilla trichodea were distributed randomly on all segments and were the most frequent type. Six sensill...
Article
The rice weevil, Sitophilus oryzae, is a serious global pest of stored grains. Fumigation with phosphine gas is the primary control method for S. oryzae, but the indiscriminate and prolonged use of phosphine gas has led to the development of heritable resistance. Developing and implementing an effective phosphine resistance management strategy for...
Article
Full-text available
The morphology, physiology, behaviour and ecology of spiralling whitefly, Aleurodicus dispersus Russell (Hemiptera: Aleyrodidae) on different host plants differ greatly. The genetic differences between the A. dispersus populations on 17 host plants were evaluated in the current study. Microsatellite markers were used to identify the presence of hos...
Article
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The flight of Tribolium castaneum (Herbst) in leaving infestations and establishing new infestations, independent of human mediation, has received little experimental attention. This study focuses on the patterns of flight of T. castaneum beetles in the nearby vicinity of an environment that provides all requirements—that is, an environment from wh...
Article
Full-text available
Rhyzopertha dominica and Tribolium castaneum are key pests of stored grains globally. Fumigation with phosphine gas is the primary control method for these beetles, so the development of phosphine resistant populations threatens the continued use of this fumigant. Developing effective strategies to manage the spread of phosphine resistance requires...
Article
Full-text available
Rhyzopertha dominica and Tribolium castaneum are key pests of stored grains globally. Fumigation with phosphine gas is the primary control method for these beetles, so the development of phosphine resistant populations threatens the continued use of this fumigant. Developing effective strategies to manage the spread of phosphine resistance requires...
Article
Biology of whitefly, Bemisia tabaci was studied on resistant (LHDP-1 and Supriya), moderately resistant (CCH-4474 and GJHV-517) and susceptible (TCH-1819 and Bunny) cotton genotypes under screen house condition. The data on the biology (incubation period, nymphal period, total developmental period, oviposition period, fecundity and sex ratio) were...
Article
Full-text available
The study was conducted for preliminary screening of 23 okra genotypes for relative susceptibility/resistance against leafhopper, Amrasca biguttula biguttula (Ishida) during 2018. The genotypes were raised in Completely Randomized Design layout and each genotype was replicated thrice. From this screening result, each genotype was categorized under...
Article
Investigations on the expression of chemosensory protein (CSP) in the antennae of S. litura revealed that the male and female adults had maximum similarity of 98 and 97 per cent, respectively. Nucleotide composition of antennal CSP gene of male and female S. litura revealed that adenine was rich with 29.5 and 29.1 per cent in male and female, respe...
Article
Plant growth promoting rhizobacteria arewidely exploited for the management of various fungal and bacterial diseases in plants. However, antiviral action of PGPR and their efficiency have been rarely investigated. In the present study, influential diversity of Bacillus species was related with tobacco streak virus (TSV) infection in cotton. The stu...
Article
Bud necrosis disease is an emerging threat for watermelon cultivation in India. It is characterized by necrotic spots and patches on leaves, bud and fruits with characteristic chlorotic ring spots as documented in Coimbatore and Villupuram districts of Tamil Nadu, India. The causative agent of this disease was identified as watermelon bud necrosis...
Article
Snake gourd and bottle gourd are the common cucurbitaceous vegetables consumed in India that are prone to viral infections under field conditions. During our field survey in Southern India in 2012-14, the symptoms viz., stunted growth, mosaic mottling, puckering and chlorosis in these crops were observed. Incidences of virus-like symptoms ranging b...
Article
Full-text available
Cryptolestes ferrugineus is a serious cosmopolitan pest of stored products. Frequent and indiscriminate usage of phosphine has caused the development of high levels of resistance to this fumigant. As there are few alternatives, it is imperative that resistance to phosphine is managed. Effective management requires knowledge of key factors driving t...
Article
Full-text available
Different coloured sticky traps includes blue, white, yellow, red and green were used to monitor the movement of thrips and the number of thrips catches at different growth stages of cotton. Results of two field trials confirmed that yellow sticky trap attracted more number of thrips compared to other colours. Yellow sticky trap recorded maximum me...
Article
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The melon thrips, Thrips palmi (Karny) (Thysanoptera: Thripidae), is one of the major early season cotton pests. Efficacy of NSKE 5%, Neem oil 1%, Andrographis paniculata leaf extract 10 %, Mirabilis jalapa root extract 10%, Lantana camara leaf extract 10%, Vitex negundo leaf extract 10% was evaluated on two life stages (2 nd instars and adults) of...
Article
Full-text available
Biochemical constitution of 22 rice accessions showing susceptible, moderately susceptible, moderately resistant and resistant reaction to yellow stem borer, Scirpophaga incertulas (Walker) were studied in 40 days old transplanted healthy and stem borer infested plants under screen house condition. Total phenol increased by range of 13.11 to 43.66...