A. N. Shukla , Y. P. Singh

Abstract

Blue pine (Pinus wallichiana A.B. Jackson) which occurs naturally in the temperate zone of Central and Western Himalayas, is attacked by dwarf mistletoe. It is a disease of low rainfall area and known only from Western Himalayas in Pakistan, Jammu & Kashmir in India and Nepal. A survey was conducted in 2005-2006 in different forest divisions of Kashmir Valley and Jammu. Symptoms and disease intensity were recorded in different girth classes of Blue pine. In young plants, spindle shaped swellings in the infected branches was the most prominent symptom. Mature tree showed deformity of branches and poor crown. There was a linear relationship between increasing girth and disease intensity, for example, only 48 per cent infection was recorded in < 30 cm girth class, while 100 per cent trees were infected in 111-200 cm girth class and above.

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B. M. Misra , S. N. Khan , Y. P. Singh

Abstract

White spongy ischolar_main-rot of Paulownia fortunei was observed in plantations raised at New Forest trial plantation and Doiwala Social Forestry plantation, Dehra Dun. Affected trees showed die-back symptom besides white cottony mycelium on bark of diseased ischolar_mains. The causal organism was identified as Heteroporus biennis (Bull. ex Fries) Bull. Pathogenicity test established the relationship of the ischolar_main-rot fungus with the disease. Field assessment of the ischolar_main-rot was also carried out in the plantation at New Forest, Forest Research Institute, Dehra Dun.

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Y. P. Singh , S. N. Khan , D. N. Joshi

Abstract

No abstract

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N. S. Bisht , Y. P. Singh , N. S. K. Harsh

Abstract

To study the mycological wealth of Kumaun Himalayas, extensive surveys were conducted. The common edible, poisonous, ectomycorrhizal, fungicolous, rare, wood-decaying fungi and their commercial uses are discussed. In-situ and Ex-situ conservation of fungi for fungal diversity has also been suggested.

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V. Mohan , Y. P. Singh

Abstract

Most woody plants depend on mycorrhizal fungi for their survival. Among the different mycorrhizal fungi, Vesicular-Arbuscular Mycorrhizal (VAM) fungi are widely distributed in varied ecosystems including arid and semi-arid deserts and associated with many plant species. An intensive survey was conducted to study the status of VAM fungal associations in Acacia spp. viz., A.nilotica sub species indica and A.tortilis sub species raddiana of various forest nurseries and plantations in arid zone of Rajasthan. The extent of VAM colonization in ischolar_mains and spore populations in rhizosphere soils were quantified. Variation in per cent ischolar_main colonization and number of VAM propagules in the rhizoshpere of both nursery and plantation samples was observed. Also, mean number of VAM propagules and per cent ischolar_main colonization were greater in plantation samples than in nursery samples. Spores from the rhizosphere soils were isolated and tentatively identified as different species of Glomus, Gigaspora and Sclerocystis genera of endomycorrhizal fungi. Among these genera, Glomus is dominant in the rhizosphere of both the tree species screened. The most predominant VAM fungi were multiplied for future nursery inoculations.

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S. P. Ahlawat , S. K. Sharma , Y. P. Singh

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Past fifty years have witnessed the development and refinement of storage conditions for seeds and other plant parts as a measure of forest tree germplasm conservation. During the last two decades the quest for genetic resource conservation has reached to such a level that existing methodologies require development of an innovative and reliable technology package for the genetic resource preservation. Techniques of in-vitro conservation hold enormous potential, however, extensive and systematic efforts to refine them into technology are needed. To date the research had mainly confined to the temperate species. Tropical forest genetic wealth which is under serious threat of depletion/extinction needs special attention for the development of in-vitro conservation strategies. The paper briefly discuss the recent approaches like in-vitro and cryopreservation technology for genetic conservation ofvaluahle plant resources and highlighted their important role in forest trees.

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V. Mohan , Neelam Verma , Y. P. Singh

Abstract

Occurrence of VAM fungi is ubiquitous and are found in most ecosystems including arid- and semi-arid deserts. A survey for collection of ischolar_mains and rhizosphere soil samples of neem from various Forest Department nurseries and plantations in arid zone of Rajasthan revealed variation in per cent ischolar_main infection and number of VAM propagules in the rhizosphere soil samples. It has been observed that mean number of VAM fungal propagules and per cent ischolar_main infection were greater in plantation samples than in nursery samples. Different VAM fungi have been isolated, of which the genus Glomus is dominant with an exception of Sclerocystis in plantations. Among the Glomus spp., G. fasciculatum is the most predominant one in both nursery and plantation. The significance of these findings is discussed.

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