Technique for screening of apple and pear germplasm against white root rot (Dematophora necatrix)

Sharma, Yashpal; Pramanick, K. K.; Thakur, Jitender; Watpade, Santosh; Kumar, Satish

doi:10.37855/jah.2017.v19i01.13

Cited by 5 publications

(5 citation statements)

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“…Paron showed significantly lowest disease severity (4.35%) as compared to all other test plants, whereas Srinagar Crab showed significantly highest disease severity (Table 4). The present findings are in consensus with the work of Sharma et al (2013), who found that different Malus species register differential disease reaction on exposure to the inoculum of white root rot pathogen, which might show the ability of host plant to nullify the effect of thermostable toxin produced by D. necatrix (Gupta and Gohain 1982). In the light of available literature, none of the available apple rootstocks were categorized resistant against D. necatrix (Sharma et al 2013), thus present findings constitute the first report on resistant rootstock against white root rot of apple (D. necatrix).…”

Section: Periodic Surveys Of Different Apple Growing Localities Insupporting

confidence: 92%

“…M. baccata (Kashmir), M. purpurea, M. prunifolia (var. ringoasami) and M. baccata (Shillong) to D. necatrix at variable disease pressure (Sharma et al 2013). They inoculated the apple plants with different number of inoculum grains (inoculated wheat grains), viz.…”

Section: Periodic Surveys Of Different Apple Growing Localities Inmentioning

confidence: 99%

“…In India, this disease was first observed in Uttar Pradesh hills (now in Uttarakhand) (Singh 1943). The earliest estimated loss due to this single disease was about ` 1.3 million (Agarwala and Sharma 1966), which is certainly expected to be much more as the disease has now been reported to occur in almost all apple-growing regions of the country (Sharma et al 2013). Affected seedlings are killed within three weeks, whereas adult plants survive for two to three seasons.…”

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confidence: 99%

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Influence of rootstocks on white root rot (Dematophora necatrix) resistance in apple (Malus baccata)

et al. 2020

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An experiment was conducted under polyhouse and field conditions during 2013, 2014 and 2015 to evaluate the level of resistance of less known apple rootstock, i.e. Paron (Malus baccata var. himalaica) and some popular rootstocks of the region (MM 106, MM 111, M 9 and Srinagar crab) against white root rot disease. All the test rootstocks were grafted with CITH Lodh Apple-1 before their use in field conditions. Paron showed high resistance against D. necatrix by exhibiting least mortality (15.33%) at highest test dose (10 g/kg soil) of inoculum in pot culture under polyhouse, whereas other test rootstocks showed 100 percent mortality at this dose of inoculum. In the field, Paron showed no wilting symptoms on scion cultivar even after 60 days of inoculation, it showed least bronzing and inward cupping of leaves (3.25%), defoliation (3.50%), necrosis on bark (21 mm), wood (17 mm) and vascular tissues (23 mm). It was rated as resistant against D. necatrix as compared to other test rootstocks on the basis of significantly lowest disease severity (4.35%) and least effect of test pathogen inoculation on its above and below ground parts. Srinagar crab was rated as highly susceptible in comparison as, it exhibited significantly highest disease severity (69.80%). From this study, it can be inferred that the rootstock of Paron should be used for shaping production of apple in Kumaon region of Uttarakhand.

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Section: Periodic Surveys Of Different Apple Growing Localities Insupporting

confidence: 92%

Section: Periodic Surveys Of Different Apple Growing Localities Inmentioning

confidence: 99%

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confidence: 99%

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Influence of rootstocks on white root rot (Dematophora necatrix) resistance in apple (Malus baccata)

et al. 2020

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“…Six treatments viz., T16 (29.17g), T9 (29.07g), T8 (28.57g), T15 (28.00g), T14 (27.63g)) and T10 (26.17g) had maximum root weight respectively while it was minimum in non-treated inoculated soil (18.83g). Same results were reported by Sharma (2000) that apple seedlings planted in healthy soil have measureable increase in shoot length, root length, shoot weight and root weight in comparison with white root infected soil. Same results were also observed under the present study.…”

Section: As Revealed Insupporting

confidence: 83%

Evaluation of biocontrol agents, botanicals and fungicidesagainst White root rot of apple caused by D. necatrixunder pot conditions

Kumar¹,

Verma²,

kardam³

2023

JMycR

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Evaluation of integrated management module against white root rot of apple caused by D. necatrix under pot conditions was checked.Evaluation of twenty three different combinations revealed that all the treatment combinations significantly lowered the disease incidence of W hite root rot of apple in comparison to control. The combinations viz.,T. viride + carbendazim, T. viride + (pyraclostrobin + metiram), T. viride + (flusilazole + carbendazim), B. oleracea var. capitata + carbendazim , B. oleracea var. capitata + (pyraclostrobin + metiram), B. oleracea var. capitata + (flusilazole + carbendazim), T. viride + B. oleracea var. capitata + carbendazim, T. viride + B. oleracea var. capitata + (pyraclostrobin + metiram), T. viride + B. oleracea var. capitata + (flusilazole + carbendazim), T. harzianum + carbendazim , T. harzianum + (pyraclostrobin + metiram), T. harzianum + (flusilazole + carbendazim), T. harzianum + B. oleracea var. capitata + carbendazim, T. harzianum + B. oleracea var. capitata + (pyraclostrobin + metiram), T. harzianum+ B. oleracea var. capitata + (flusilazole + carbendazim), carbendazim , pyraclostrobin + metiram and flusilazole + carbendazim were highly effective and provided complete control of the disease when applied twice at 7 days interval after soil inoculation. The combinations T. viride + B. oleracea var. capitata, T. harzianum + B. oleracea var. capitata, T. viride, T. harzianum and B. oleracea var. capitata were least effective showing only 11.11, 11.11, 25.92, 25.92 and 11.11 per cent disease incidence respectively. After 15 days of pathogen inoculation there was no disease incidence in any one of the treatment and disease appeared (33.33%) in T. viride and T. harzianum after 30 days of inoculation. It increased at slower rate (33.33 to 44.44 %) in T. viride + B. oleracea var. capitata, T. harzianum + B. oleracea var. capitata, T. viride and T. harzianum to 45 days. The rot weight of above treatments ranged between 24.47g-29.07g and the pH of the soil of all treatments ranged between 7.0-7.5. The total microbial count of treated plants lied between 10.67-14.33×10 4 .

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“…The infected trees manifest disease commencement on above and underground plant parts through decline in the vigour of the plant bolstered by bronzing, wilting and eventually defoliation. The level of underground infection determines the damage to brous root system, and subsequently encircling of primary and secondary roots with greenish grey hyphal stands, leading to formation of occulent web of whitish ribbons during monsoon season (Sharma 1993). Initially, the total estimated annual losses due to this disease were recorded to be $1.3 million, which has jumped to about $1.6 million dollars in 2002 (Agarwala and Sharma 1966; Williamson 2003).…”

Section: Introductionmentioning

confidence: 99%

Disease suppression, growth promotion and colonization attributes of resident endophytic bacteria against white root rot (Dematophora necatrix Hartig) of apple

Pal,

Sharma,

Sharma

2023

Preprint

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The inherent potential of apple trees was investigated to explore bacterial endophytes and their role in suppressing Dematophora necatrix, the incitant of white root rot disease. Resultantly 34 endophytic bacteria secluded from healthy apple plants, and subsequently 6 most efficient isolates viz. Bacillus megaterium strain EA3, Enterobacter sp. strain EA7, Bacillus megaterium strain EK2, Stenotrophomonas maltophilia strain EK6, Acinetobacter nosocomialis strain ES2 and Pseudomonas aeruginosa strain ES8 depicting anti-pathogen interactions through preliminary screening were further assessed under in vitro, glasshouse and field conditions against white root rot disease. Maximum mycelial growth inhibition (80.37%) was obtained in S. maltophilia strain EK6 encouraging for its seed treatment and soil application thereby providing significant effective control (87.91%) of white root rot under controlled culture situations as compared to other five bacterial endophytes evaluated simultaneously, followed by field efficacy of 83.70 per cent. In addition, it has significantly enhanced the growth parameters of apple trees under both the situations. The inoculated healthy plants were assessed for endophytic colonization which revealed maximum endosphere colonialism by S. maltophilia strain EK6. Additionally, confocal microscopic explication of transverse sections of root cells colonized by bacterial endophytes as compared to untreated control implied their persistence and establishment in endosphere of apple seedlings. This investigation emphasized the first evidence of interaction between apple associated bacterial endophytes and D. necatrix, therefore these endophytes could be employed as alternative for mitigating white root rot disease in future.

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Technique for screening of apple and pear germplasm against white root rot (Dematophora necatrix)

Cited by 5 publications

References 5 publications

Influence of rootstocks on white root rot (Dematophora necatrix) resistance in apple (Malus baccata)

Influence of rootstocks on white root rot (Dematophora necatrix) resistance in apple (Malus baccata)

Evaluation of biocontrol agents, botanicals and fungicidesagainst White root rot of apple caused by D. necatrixunder pot conditions

Disease suppression, growth promotion and colonization attributes of resident endophytic bacteria against white root rot (Dematophora necatrix Hartig) of apple

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