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sur le développement des zones arides et semi-arides

Titre : Effect of Entomological and pathological agents on the vegetative propagation, growth and yield of Natural and Nursery population of Hippophae salicifolia D.Don

Auteur : Charan, G S

Université de soutenance : Uttarakhand University of Horticulture and Forestry, Bharsar

Grade : Master of Science in Forestry (Forest products & Utilization) 2017

Résumé
An investigative study was conducted for one year to investigate the effect of entomological and pathological agents on the vegetative propagation, growth and yield of Natural and Nursery population of Hippophae salicifolia D.Don. Invasive pests that gained entry into this cold arid region of India have cost catastrophic damage on commercial agriculture, horticulture crops and forest trees. Out of three fungal pathogens isolated i.e. C1 (isolated from cambium), R1 (Isolated from primary root) and R2 (isolated from secondary root), R2 seems to the fast growing species followed by R1 and C1. Only C1 produced honey dew like droplets on the surface of hyphal mass and showed slight alteration of colour from brilliant white to slightly yellowish white. Though the damage and effects of these fungal species on the vegetative propagation of Hippophae cuttings of four month experiment period could not be quantified because of the complexity of the diseases. Only about 4.51% of the 288 cuttings survived as healthy five month old seedlings. The variation of rooting media (8 substrates) or the rooting hormone concentrations (3 ppm concentrations) did not influence any advantage for the Hippophae cuttings for healthy and infection free growth. Mountain areas of Yamunothri regions are characterized by inaccessibility, fragility, marginality, diversity, niches and adaptation mechanisms. Insects like Aphids, Psyllid Bug, Heartwood Borer, Altica beetle, Plant Hopper, Phytophagus Caterpillar and Ground Beetle where recorded in association with the Hippophae salicifolia in Yamunotri region and Forest Nursery, Ranichauri, either causing considerable damage to the growth or yield or simply associated ecologically as a part of complex web of nature. Predatory mite was also recorded feeding on aphid and plant hopper nymphs. Damage by Aphids and Plant hoppers was observed to be very high due to change in moisture balance of the conduction tissue. With increasing temperature and decreasing rainfall in Yamunotri region, the pest population would only increase

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