Seed borne infection

The present investigation on different seed health testing was undertaken during 20012-13 at Department of Plant Pathology, College of Agriculture, Bijapur, UAS, Dharwad. Among six different seed health testing methods used to assess their efficacy and reliability, standard blotter method was found to be good for the detection of seed borne infection of A. sesami in sesame.

6p gaocaolon9 22-12-2020 14 1   Download

Black scurf of potato caused by Rhizoctonia solani is one of the most important disease in the category of soil and tuber borne disease especially in fungal group. Infested seed tubers are the main source of infection. Boric acid and pencycuron are the two chemicals which are frequently used by the Indian farmers to control black scurf of potato.

6p trinhthamhodang1215 23-09-2020 15 2   Download

The present investigations was carried out to study the effect of hot water seed treatment comprised of different ranges of temperature (47-49, 50-52 and 53-55 °C) and discrete duration of time (30, 45 and 60 min.). The seeds of bell pepper and their most important seed-borne pathogens (Alternaria spp., Curvuleria spp., Penicillium spp., Fusarium spp. Colletotrichum spp.) have been investigated in laboratory. Thee numbers of infected seeds were observed and recorded daily and per cent incidence was evaluated.

8p caygaocaolon6 30-07-2020 12 1   Download

The scanning electron micrograph of various fungi growing over sorghum and wheat seeds showed that, the conidia of Curvularia lunata were slightly curved, three septate, central cell were broad having surface ornamentation, darker than the end cell and arranged on sympodially branched conidiophores on sorghum seed.

6p trinhthamhodang5 16-05-2020 11 1   Download

Fifty seed of sorghum, wheat and pearlmillet from infected seed lot having characteristics symptom of seed borne fungi. Seed of such symptoms got infected of Curvularia lunata, Bipolaris sorghicola and B. sorokiniana infected seed of sorghum wheat and pearlmillet. Histopathology of apparently in infected seeds confined to mycelium fragments of Curvularia lunata in seed coat and endosperm, embryonic region of sorghum, wheat and pearlmillet seed. Sorghum and pearlmillet seed indicates the presence of brown coloured thicks mycelial fragment of Bipolaris sorghicola in pericarp and embryo region.

5p trinhthamhodang5 16-05-2020 10 1   Download

Mungbean is grown principally for its protein content. Seed borne mycoflora affect the germination and vigour of seeds. Seed health is an important factor in the control of diseases, since an infected seed is less viable, has low germination, reduced vigour and reduced yield.

10p trinhthamhodang5 16-05-2020 9 1   Download

Chickpea seed were bioprimed with vermiculite and later with biocontrol agents for their efficacy on seed borne infections and seedling vigour of the plant. Among the seven treatments tested, the treatment P. fluorescens @ 0.8 % + T. harzianum@ 0.8 % + Vermiculite shown the least seed infection of 13.00 per cent, highest seed germination of 91.00 per cent and vigour index of 1753.

5p kethamoi4 16-04-2020 7 1   Download

During the present investigation yellow vein mosaic disease in bhendi (Abelmoschus esculentus (L.) Moench) caused by a whitefly Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) transmitted Begomovirus particularly Bhendi yellow vein mosaic virus [INNVS-2018] or BYMV [IN-NVS-2018] or BYMV was characterized by symptoms of homogenous interwoven network of yellow veins enclosing islands of green tissues.

7p caygaocaolon4 04-04-2020 13 2   Download

Rhizoctonia solani causing sheath blight of rice is reported to survive through soil and collateral hosts. Although it infects seed in field, role of seed-borne inoculum in disease development is not properly understood. However, only little information is available on the role of seed-borne inoculum in disease development in the field (Roy, 1989; Acharya and Gupta, 1996; Silvalingam et al., 2006). During the present investigation seed samples of two varieties were collected from healthy seeds (i.e. seeds harvested from healthy plant panicles) and diseased seeds (i.e.

14p caygaocaolon2 14-03-2020 9 0   Download

Seed health testing to detect seed-borne pathogens is an important step in the management of crop diseases. Laboratory experiments were carried out at College of Agriculture, Bhawanipatna during Kharif, 2018 to investigate the planting value of the seed and extent of seed-borne fungal pathogen problems from farmers saved seeds in Western undulated Zone of Odisha. A total number of six seed samples of Sesame were collected from farmers saved seeds in M. Rampur, Karlapada, Bhawanipatna, T. Rampur, Kesinga and Narla block of Kalahandi districts.

6p chauchaungayxua3 07-02-2020 14 0   Download

Pythium damping-off of Chilli (Capsicum annuum L.) is very common problem in fields and greenhouses, whereas the organism kills newly emerged seedlings. In present investigation repeated isolations from rotten seeds as well as toppled seedlings of Chilli cv. Pusa Jwala have yielded the cultures of P. aphanidermatum. The damping off mainly being soil borne, the primary infections are needed to be controlled with suitable fungicides. The different fungicides and bioagents were evaluated as seed dressers and soil drenching.

12p chauchaungayxua3 07-02-2020 13 0   Download

Sesame (Sesamum indicum L.) is one of the most ancient oil seed crop cultivated in tropical and sub-tropical countries. Irrespective of the agro-climate conditions, sesame is liable to be infected by various pathogenic fungi. Among the fungal diseases, stem and root rot of sesame caused by Macrophomina phaseolina affects severely at all stages of crop growth. Macrophomina phaseolina is a diverse, omnipresent soil borne pathogen. The pathogen survives as sclerotia in the soil and in host tissue for varying periods.

5p kethamoi2 15-12-2019 15 0   Download

Seed is the custodian of the genetic, potential of any cultivar and determines the limits of productivity in any cropping system. So awareness for seed health has increased among the growers, traders and consumers in recent years. A seed-borne inoculum not only secures the presence of a virulent strain of the pathogen along the seed but also favors the earliest possible establishment of the infection in seedlings along with possible threat of introduction of new physiological races/stains with seed.

6p kequaidan2 11-12-2019 12 0   Download

Lentil (Lens culinaris) is affected by the wilt disease caused by fungal pathogen Fusarium oxysporum f.sp. lentis at seedling stage and at the later stages of growth. The pathogen is soil and seed borne in nature and reported from all lentil growing areas. The present investigation is on the management of the lentil wilt pathogen by exploiting the resistance mechanism of the host. Ninety two germplasms were screened along with the local check (Sehore) under field conditions during the two consecutive years 2016-17 and 2017-18.

7p kequaidan2 11-12-2019 15 1   Download

Out of twelve fungicides and three bio-agents screened in the laboratory, Bavistin, Indofil M-45, Chlorothalonil, Vitavax and Thiram proved most effective as they caused total inhibition of the pathogen. Indofil Z-78, Captafol, Ziram, Captan and Blitox-50 were also found to be significantly superior compared to other fungicides. Out of five seed dressing fungicides and three bio-agents, Trichoderma viride proved to be the most effective followed by Trichoderma harzianum, Bavistin and Thiram in controlling the seed –borne infection of Alternaria alternata.

10p nguaconbaynhay1 04-12-2019 16 1   Download