Plant Stimulation Aids in Control of Pissodes nemorensis on Cedrus deodara

1943 ◽  
Vol 36 (2) ◽  
pp. 345-345
Author(s):  
W. C. Nettles
Keyword(s):  
Cedrus Deodara ◽  
Pissodes Nemorensis

Influence of temperature on the development and reproduction of Cinara cedri (Hemiptera: Aphidoidea: Lachninae)

2021 ◽  
pp. 1-6
Author(s):  
Yingchao Ji ◽  
Guohua Li ◽  
Chenggang Zhou ◽  
Shuyan Yin
Keyword(s):  
Intrinsic Rate ◽  
Intrinsic Rate Of Increase ◽  
Threshold Temperature ◽  
Reproduction Rate ◽  
Cedrus Deodara ◽  
Developmental Threshold ◽  
Factors Affecting ◽  
Rate Of Increase ◽  
Influence Of Temperature On ◽  
Development Duration

Abstract Temperature is one of the main factors affecting insect growth, development and reproduction. The effects of temperatures (10, 15, 20, 25 and 30°C) on the development and reproduction of Cinara cedri Mimeur (Hemiptera: Aphidoidea: Lachnidae) fed on Cedrus deodara (Roxb.) G. Don were evaluated in this study. With the increase of temperature from 10 to 30°C, the development duration at different development stages gradually shortened. There was a significant positive correlation between the developmental rates and temperature, following a quadratic regression model. The lower developmental threshold temperature (C) and effective accumulated temperatures (K) for completing a generation were 4.13°C and 263.4 degree-days, respectively. The highest fecundity was observed at 20°C with 25.74 first-instar nymphs/female. Both the highest intrinsic rate of increase (r, 0.11 ± 0.03) and net reproduction rate (R0, 19.06 ± 2.05) were observed at 20°C, whereas the lowest values of r (0.05 ± 0.01) at 10°C and R0 (5.78 ± 0.88) at 30°C were observed. The results suggest that temperature significantly affects the biology of C. cedri and the optimal temperature for its development is 20°C.

Floristic Diversity Along An Altitudinal Gradient in Lakadmandi Beat of Kalatop Khajjiar Wildlife Sanctuary of District Chamba, Himachal Pradesh

2016 ◽  
Vol 39 (2) ◽  
pp. 101-110
Author(s):  
R. Verma
Keyword(s):  
Medicinal Plants ◽  
Plant Species ◽  
Altitudinal Gradient ◽  
Himachal Pradesh ◽  
Ex Situ ◽  
Floristic Diversity ◽  
Wildlife Sanctuary ◽  
Cedrus Deodara ◽  
Quercus Leucotrichophora ◽  
Herb Species

A study was conducted to understand the floristic diversity along an altitudinal gradient with elevations varying from 1800-2400m above msl in Lakadmandi beat of Kalatop Khajjiar Wildlife Sanctuary in district Chamba, Himachal Pradesh during 2011. Total number of plant species was 81 belonging to 52 families and 76 genera. The dominant families were Asteraceae, Rosaceae, Pinaceae and Polygonaceae. The number of trees species was 6, 6 and 10 with the dominance of Quercus leucotrichophora, Cedrus deodara and Cedrus deodara at 1800-2000m, 2000-2200m and 2200-2400m elevation ranges respectively. The number of shrub species was 16, 13 and 23 with the dominance of Quercus leucotrichophora sapling, Sarcococca saligna and Sarcococca saligna at 1800-2000m, 2000-2200m and 2200-2400m elevations respectively. The number of herb species was 46, 46 and 58 at 1800-2000m, 2000-2200m and 2200-2400m elevation ranges respectively. On the basis of Importance Value Index (IVI), Valeriana jatamansii was the dominant herb at 2000-2200m and 2200-2400m elevation ranges respectively. The distribution pattern of most of plant species was contiguous at all altitudinal ranges. Index of diversity for herb species in these elevational ranges was 3.420, 3.568 and 3.250. Out of 40 medicinal plant species recorded from the area, 3 species i.e. Paris polyphylla, Podophyllum hexandrum and Taxus wallichiana fall in the category of threatened plants. The better conservation of natural resources can be done through promotion of community based conservation, ex-situ conservation through tissue culture, developing cultivation technologies and nurseries of medicinal plants and conducting of regular training on the procedure of medicinal plants collection and processing among the end users.

scholarly journals A comparative evaluation of Kumaun Himalayan Gymnosperms for their Antifungal potential against plant pathogenic fungi

2018 ◽  
Vol 7 (3) ◽  
pp. 230-241
Author(s):  
Savita Joshi ◽  
◽  
Parikshit Kumar ◽  
Prabha Pant ◽  
SC Sati ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Fungal Pathogens ◽  
Ethanol Extract ◽  
Pathogenic Fungi ◽  
Total Activity ◽  
Maximum Activity ◽  
Diffusion Method ◽  
Phytochemical Analysis ◽  
Cedrus Deodara ◽  
Araucaria Cunninghamii

Fungicidal activity of 10 ethnobotanically known Kumaun Himalayan gymnospermous plants namely Araucaria cunninghamii, Biota orientalis, Cedrus deodara, Cephalotaxus griffithi, Cryptomeria japonica Cupressus torulosa, Ginkgo biloba, Juniperus communis, Picea smithiana and Pinus wallichiana were tested against six plant disease causing fungal pathogens by agar well-diffusion method. Forty extracts of these gymnospermic leaves in different organic solvents (methanol, ethanol, chloroform and hexane) were studied by performing the 160 sets of experiments. The MIC values of each extract (where % inhibition ≥ 40%) were also determined. All the plant extracts exhibited strong antifungal activity. Results indicated that all leaves extracts of C. griffithi and G. biloba were found most effective among the tested plants extracts. Hexane extract of C. griffithi was showed highest inhibitory activity against C. falcatum (72%; MIC, 7.81µg/ml) and T. indica (70%; MIC, 15.62µg/ml). On the other hand, ethanol extract of G. biloba also showed remarkable activity against P. oryzae (66% with MIC, 7.81g/ml). While P. wallichiana leave extracts were found less active among the studied plants against all the tested fungal strains. The chloroform extracts were found the most effective against all the tested fungi (10% to 60%), followed by ethanol extract (30-50%), methanol extract (20-40%), while in hexane extracts ranged 10-30% only. The extracts of C. griffithi exhibited superior Relative Antifungal Activity (RAA, 20%), followed by G. biloba and A. cunninghamii (RAA, 19 and 12%, respectively). All data were also analyzed for determination of total activity of plant for each studied species of gymnosperm. C. griffithi had maximum activity i.e. 71 % followed by G. biloba (54%) and A. cunninghamii (33%). C. torulosa showed the least total activity and RAA i.e. 8% and 3%, respectively. All the plant species assayed possess definite antifungal properties and suggested for phytochemical analysis to identify the active principles responsible for their antifungal activity

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