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Mehrotra, M. D.
- Two Destructive Nursery Diseases of Holoptelia integrifolia and their Management
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Indian Forester, Vol 124, No 1 (1998), Pagination: 79-81Abstract
No abstract
- Rhizoctonia Aerial Blight - a Destructive Nursery Disease and its Management
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Indian Forester, Vol 124, No 8 (1998), Pagination: 637-645Abstract
The paper records for the first time the occurrence ofleafblight. a new disease of Cassia fistula Linn.. Bauhinia variegata Linn.. Dalbergia sissoo Roxb. and Populus deltoides Marsh caused by Rhizoctonia solani Khun anamorph of Thanatephorus cucumeris (Frank) Donk in the nurseries in Western Uttar Pradesh. Of the three morphologically different biotypes of the fungus found on diseased plants. one formed typical dark brown sclerotia. the other produced micro-sclerotia. while the third did not produce sclerotia. The disease caused blighting and webbing ofleaves by the fungal hyphae running over the infected aerial parts and forming cobweb like structure. Stromatoid aggregates developed on the surface of infected leaves and clusters of hyphae formed at the base of the petiole or petiolule. The disease caused premature defoliation and group infection of seedlings due to lateral spread of the disease through contact of the overlapping foliage of the adjoining seedlings. Epidemiology of the disease. mode of infection and extent of damage to the seedling crop are described and measures for management of the disease outlined.Full Text
- Diseases of Paulownia and their Management
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Indian Forester, Vol 123, No 1 (1997), Pagination: 66-72Abstract
Diseases of Paulownia, an exotic to India, have been studied in the nursery and young plantations and management of the potentially destructive diseases has been worked out. In all seven fungal diseases and one bacterial disease have been recorded on P. fortunei. They are damping-off caused by Rhizoctonia solani, ischolar_main and basal rot by Rusarium sp. And R. solani, leaf spotting and blight by Corynespora cassiicola, Cercospora sp. and Pseudocercospora sp and leafblight by R. solani and Phytophthora nicotianae. Of the above diseases ischolar_main and basal rot, Pseudocercospora and Corynespora leaf spotting and blight and leaf blight by Phytophthora nicotianae and R. solani are the diseases hitherto unknown and are reported for the first time. Root and basal rot, which is highly destructive and is responsible for routing the plantation at New Forest, has been successfully controlled through cultural practices involving mound planting or planting on raised strips and soil amendment by mixing sand with soil (1:1). Root/shoot cuttings if planted in February-March ensures the young crop free from ischolar_main and basal rot as the tissues become sufficiently mature by the time monsoon rains set in. Similarly, potting mixture with soil and sand (2:1) and 2 per cent well decomposed FYM is recommended to minimise the disease. A bacterial disease caused by a rod-shaped bacterium is the first record of the disease on P. fortunei. Cladosporium cladosporioides plastering the lower leaf surface and a sooty mold growing on the supper leaf surface are recorded. On P. tomentosa the diseases have been studied in the nursery only. Five fungal diseases recorded on this species are damping-off caused by Fusarium sp. And Rhizoctonia solani, leaf spotting and blight by Cercospora sp. Pseudocercospora sp. and Corynespora cassiicola and leafblight by P. nicotianae. Both Paulownia species show high susceptibility to Meloidogyne, the ischolar_main knot nematode. Use of deoiled neem cake @ 15 g/per pot is recommended to overcome the nematode problem in the nursery.- Some Destructive forest Diseases and their Management
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Indian Forester, Vol 123, No 7 (1997), Pagination: 674-678Abstract
No abstract- Fantastic Growth Response of Paulownia to Mycorrhization and Fertilization
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Indian Forester, Vol 123, No 9 (1997), Pagination: 873-875Abstract
No abstract- Root and Heart Rots in Acacia mangium Plantations in India
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Indian Forester, Vol 122, No 2 (1996), Pagination: 155-160Abstract
Root-rot of Acacia mangium by Ganoderma lucidum and heart rots by Phellinus pachyphloeus and Trametes palustris have been recorded from plantations raised in West Bengal. The exotic appears to be highly susceptible to Ganoderma ischolar_main-rot which is quite prevalent in Midnapore Forest Division. Heavy mortality in 1985 plantation is viewed with concern by the State Forest Department. Effective measures to keep the disease in check have been outlined. Heart rots caused by Phellinus pachyphloeus and Trametes palustris are the first records of decay in standing trees of A. mangium in India. Though decay, at present, is not a serious problem it is likely to be highly damaging in older stands in view of the progressive nature of decay. Preventive measures for heart rots are recommended.- New VAM Technology and its Application
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Indian Forester, Vol 122, No 4 (1996), Pagination: 348-350Abstract
No abstract- Multiplication of VAMF on Paulownia - a Veritable Possibility
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Indian Forester, Vol 122, No 9 (1996), Pagination: 858-860Abstract
No abstract- A Practical Approach to Mycorrhize Containerised Seedlings in Forest Nurseries
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Indian Forester, Vol 121, No 7 (1995), Pagination: 670-672Abstract
No abstract- Basal and Root Rot of Paulownia fortunei Caused by Rhizoctonia solani
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Indian Forester, Vol 120, No 6 (1994), Pagination: 544-544Abstract
No abstract- Rhizoctonia Leaf Blight, a New Disease of Anthocephalus chinensis
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Indian Forester, Vol 119, No 7 (1993), Pagination: 590-591Abstract
No abstract- Rhizoctonia Leaf Spotting and Blight of Michelia champaca. A New Nursery Disease and its Management
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Indian Forester, Vol 118, No 3 (1992), Pagination: 227-229Abstract
Leaf spotting and blight, a new disease of Michelia champaca caused by Rhizoctonia solani anamorph of Thanatephorus cucumeris is described and management of the disease outlined. The disease has been successfully controlled through an integrated approach involving measures such as sanitation and cultural practices. Raising of seedlings in polypots instead of beds is recommended as it minimises the incidence of the disease considerably.- A Study on the Periodicity of Foliage Diseases of Albizia lebbek and Control of Camptomeris Leaf Spot in Nursery
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Indian Forester, Vol 118, No 8 (1992), Pagination: 594-598Abstract
A disease calendar for nine fungal diseases of Albhia lebbek is prepared for the first time. This will help in management of the diseases of this important tree species in the nursery. Camptomeris leaf spot, an important nursery disease has been effectively controlled by the application of Topsin-M, Jkstein and Dithane M-45. Three to four applications of any of the effective fungicides at tri weekly intervals are recommanded for disease management.- Some New Host Records of Root Knot Nematodes
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Indian Forester, Vol 118, No 11 (1992), Pagination: 856-857Abstract
No abstract- Meloidogyne Spp.- Cause of Root-knot of Important Forest Tree Species in Nurseries
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Indian Forester, Vol 118, No 12 (1992), Pagination: 961-962Abstract
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- Camptomeris Leaf Spot of Leucaena leucocephala
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Indian Forester, Vol 116, No 7 (1990), Pagination: 593-594Abstract
No abstract- Occurrence of Root Knot Nematodes in forest Nurseries
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Indian Forester, Vol 116, No 10 (1990), Pagination: 846-846Abstract
No abstract- Rhizoctonia Top Flagging-a Potentially Dangerous New Disease of Pinus kesiya
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Indian Forester, Vol 116, No 11 (1990), Pagination: 920-923Abstract
Top flagging, a highly destructive disease of Pinus kesiya caused by Rhizoctonia solani anamorph of Thanatephorun cucumeris is described for the first time from India. Seedling raised in the beds suffered heavy casualty to the extent of 70-80% following heavy rain. Warm and excessive humid conditions favoured the development of the disease. The disease spread from plant to plant through contact of the foliage. Group dying of seedlings, drooping of top and entangling of top and entangling by fungus hypbae were the characteristic features of the disease. Overcrowdings of seedlings may be avoided in the beds and also the disease seedlings removed as soon as the symptoms of the disease are noticed. This will help in preventing lateral spread of the disease by contact. It has been possible to keep the incidence of the disease under check by raising the seedlings in polypots.- A Study on Fungal Deterioration of Seed and Damping off in Oroxylum indicum and their Control
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Indian Forester, Vol 116, No 12 (1990), Pagination: 977-979Abstract
Heavy loss of seeds in Oroxylum indicum due to fungal detrioration while seeds Were still on the tree was recorded in the forests in and around Burnihat, Assam. The loss was to the extent of 52% within a period of about two to three weeks after pre-monsoon rains in April. The moulds, Aspergilli and Penicillia of which the latter were predominants were associattd with seed deterioration and they colonized the seeds and damaged them completely after partially opened pods were drenched with rain water. Limely exraction of seed from the pods by mid- March before the onset of rains is advisable to prevent fungal deteriorationl Further seed dressing with ceresan is recommended to prevent fungal deterioration during storage and loss in germinal ion percentage. Advancing the Sowing time by a forenight i.e in the early port of the second week March or middle of March obviated seedling mortality due to damping off by Fusarium solani. Seed germinafion was best at a depth of O.5 cm.- Rhizoctonia Leaf Spotting and Blight of Rauvolfia serpentina a New Disease from India
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Indian Forester, Vol 116, No 5 (1990), Pagination: 372-374Abstract
Leaf spotting and blight of Rauvolfia serpentina (Linn.) Benth ex Kurz by Rhizoctonia solani anamorph of Thanatephorus cucumeris (Frank) Donk is reported for the first time from India. The disease caused premature defoliation during July and August when the rains were frequent and heavy. The pathogen also attacked weeds growing along with Rouvotfia serpentina. Weeding in plantations upto a distance of 45 cm effectively controlled the disease.- A New Leaf Spot Disease of Derris robusta
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Indian Forester, Vol 115, No 4 (1989), Pagination: 268-269Abstract
The pathogen Stigmina millettiae Ellis on Derris robusta is reported as first record in this paper.- Leaf Blight of Some Hardwood Species in Assam and Meghalaya and its Control in the Nursery
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Indian Forester, Vol 115, No 6 (1989), Pagination: 378-384Abstract
The paper gives an account of leaf web-blight of Melia azedarach Linn., Azadirachta indica A. Juss., Cassia nodosa Ham, Ceiba pentandra (Linn.) Gaertn. And Derris robusta Benth. Caused by Rhizoctonia solani anamorph of Thanatephorus cucumeris (Frank) Donk and leaf blight of Engelhardtia spicata Blume caused by Sclerotinia sclerotiorum (LIB.) de Bary. These diseases are recorded for the first time in India. The Rhizoctonia web blight was highly destructive in the nursery. It damaged the foliage as well as killed the heavily infected young seedlings. M. azedarach and A. indica were highly susceptible to the disease and the damage to the foliage was to the extent of 80-90%. Obviously, this had perceptible impact on the growth of the seedlings in these two species. The existence of more than one strain of the pathogen in the forests at Burnihat is emphasized. The disease may be kept under check by avoiding dense sowing of seed and removal of the infected seedlings as soon as the disease appears in the bed. In case of M. azedarach and A. indica which are highly susceptible to the disease, it is recommended that these two species be raised in pathogen, presumably soil borne, is easily carried to the plant parts close to the ground through splashing and thus it is likely to cause heavy damage to the susceptible species raised in beds. However, the chances of infection through splashing are very much reduced if the seedlings are raised in polypots. Moreover, it has been found that A. indica when raised in polypots at Burnihat was almost free from the disease.- Corynespora Cassiicola Leaf Spot of Ceiba pentandra and its Control in the Nursery
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Indian Forester, Vol 115, No 12 (1989), Pagination: 905-909Abstract
A new leaf spot of Ceiba pentandra caused by Corynespora cassiicola is described for the first time from India The disease was highly destructive during the winter months infecting aod damaging about 40 per cent of the leaf area. Infection spots were produced in large number but mostly the spots were below 2-3 mm and big spots, 4-12 mm in size were relatively few in number. The disease bas been successfully controlled by the application of Bavistin at fortnightly interval Dithane M-45 was almost equally effective followed by Blitox and Captaf. On the orber band, Foltaf was not significantly different from control.- Periconia Leaf Spotting and Blight of Hevea brasiliensis - a New Disease from India
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Indian Forester, Vol 114, No 7 (1988), Pagination: 405-409Abstract
Leaf spotting and blight of Hevea brasiliensis (N.B.K.) Muell. Arg. caused by Periconia manihoticola (Vincens) Viegas is a new disease reported for the first time from India. The pathogen attacks the young seedlings and causes significant damage to the foliage and premature defoliation. Cool nights and dew favour the development of the disease in shaded beds. The absence of the disease in beds fully exposed to the sun indicates that it can be checked or averted by establishing the nurseries in open areas. A laboratory bioassay of fungicides showed that Bavistin and Dithane M-45 are quite effective as the fungus failed to grow altogether in the presence of these fungicides.- Pleiochaeta setosa - a New Pathogen of Delonix Regia
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Indian Forester, Vol 114, No 8 (1988), Pagination: 482-483Abstract
No abstract- Some New Host Records and Additions to Fungi of India
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Indian Forester, Vol 111, No 7 (1985), Pagination: 533-537Abstract
no abstract- Studies on some New and Interesting Foliar Diseases of Sterculia urens and their Control
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Indian Forester, Vol 111, No 10 (1985), Pagination: 821-831Abstract
The foliar diseases of Sterculia urens Roxb. Caused by Cercoseptoria sterculiae Mehrotra, Alternaria macrospora Zimm. Var. sterculiae Mehrotra, Phoma jobyana Pirozynski & Morgan Jones, P.macrostoma Mont., Myrothecium rotidum Tode ex Fr., Macrophomina phaseolina (Tassi) Gold., and Cercospore stercu1iae Agarwal & Hasija are recorded. Cereoseptoria sterculiae and A. macrospora var. stercu1iae are described as new species and new variety respectively. The other pathogens except Cercospora sterculiae have not been recorded on this host earlier. An account of the disease situation in the nursery and natural forests is given. Both dithana M-45 and cupramar+unizeb applied as foliar spray (0.2%) at fortnightly intervals effectively controlled the diseases in the nursery. Unizeb alone ranked amongst the treatments as the next best. Cupramar was, however, mildly effective.- Study of the Effect of Gibberellic Acid Urea and Rallis Tracel on the Growth of Teak in the Nursery-I. Enhancement of Growth of Seedling to Transplantable Size in the same Growing Season-a Veritable Possibility
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Indian Forester, Vol 104, No 10 (1978), Pagination: 706-713Abstract
The effect of gibberellic acid and nutrients on the growth of teak (Tectona grandis) seedlings in the nursery has been studied. Gibberellic acid when applied alone enhanced height growth of seedlings but at the same time caused ill effects on plant growth. The plants were lanky, chlorotic and developed leaves much reduced in size. The ill effects were more pronounced at 200 ppm than at 100 ppm. However, when the treatment of seedlings with gibberellic acid at 100 ppm was followed by weekly application of urea aad Rallis Tracel, it not only caused reversal of ill effects but alao increased appreciably overall growth of the plants. The plants were vigourously growing and were taller and stouter than the control seedlings. Teak seedlings responded positively to the application of urea The growth of seedlings was considerably enhanced and they developed leaves larger than the control seedllngs. Rallis tracel when applied in combination with urea further increased leaf size and the leaves in this treatment were largest in size. Root-shoot cuttings of the seedlings treated with urea, urea + Rallis Tracel, gibberellic acid at 100 ppm + urea + Rallis tracel and control seedlings when planted in the field showed 100% sprouting in all the cases. Utilization of nursery stock for planting in the same growing season has been emphasized. It is suggested that by early sowing of seed, adequate watering of seedlings during summer months, judicious application of growth hormones and nutrients it may be possible to increase growth of teak seedling. In the nursery to transplantable size by the middle of Jully in the same growing season, instead of middle of August as obtained in the present investigation.- Fused Needle Disease of Pinus caribaea in India
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