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Kennedy, J. S.
- Effect of Elevated Temperature on Life-History Parameters of Rice Yellow Stem Borer (Scirpophaga incertulas Walker)
Abstract Views :287 |
PDF Views:77
Authors
Affiliations
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
1 Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN
Source
Current Science, Vol 110, No 5 (2016), Pagination: 851-857Abstract
A study was undertaken to understand the effect of increasing temperature on population dynamics of yellow stem borer (YSB), Scirpophaga incertulas. Experiments were carried out in a temperature control chamber with five different constant temperatures (28°C, 30°C, 32°C, 34°C and 36°C). The data on agespecific life table at varying temperature regimes revealed that the total lifespan of YSB extended to a maximum of 52 days at 28°C followed by 49 days at 30°C and 46 days at 32°C. In general, survival of the YSB decreased with increasing temperature. Preoviposition period for YSB also decreased with increasing temperature. However, the total number of eggs laid by YSB increased with increasing temperature. Also, 50% fecundity in YSB was recorded on 49.7 days after incubation at 28°C, whereas it was observed as early as 34.4 days at 36°C. All the growth parameters were observed to decrease at 36°C, which reveals that temperature increase above 34°C is detrimental to the development of YSB. The above results reveal that, if the global warming continues at the present phase, it will negatively influence YSB and the population growth will be severely affected in the near future.Keywords
Global Warming, Life and Fecundity Tables, Population Dynamics, Temperature Regime, Yellow Stem Borer.Full Text
- Effect of temperature on brown planthopper Infestation in rice using hyperspectral remote Sensing
Abstract Views :95 |
PDF Views:64
Authors
S. Sivaranjani
1,
V. Geethalakshmi
1,
S. Pazhanivelan
1,
J. S. Kennedy
1,
S. P. Ramanathan
1,
R. Gowtham
2,
K. Pugazenthi
1
Affiliations
1 Tamil Nadu Agricultural University, Coimbatore 641 003, India., IN
2 Indian Farmers Fertilizers Cooperative Limited, Coimbatore 641 003, India., IN
1 Tamil Nadu Agricultural University, Coimbatore 641 003, India., IN
2 Indian Farmers Fertilizers Cooperative Limited, Coimbatore 641 003, India., IN
Source
Current Science, Vol 124, No 10 (2023), Pagination: 1194-1200Abstract
Hyperspectral remote sensing captures images in multiple wavelengths and is widely used to detect plant stress in agriculture. A study was conducted on brown planthopper (BPH) infestation in rice at various temperature regimes (15°C, 20°C, 25°C, 30°C and 35°C). The experimentation was done in the Environmental Control Chamber, Tamil Nadu Agricultural University, Coimbatore, India. The field spectroradiometer and vegetation indices were used to study the early and late infestations of BPH in rice. The results reveal that reflectance at certain wavelengths (550, 670 and 700 nm) indicates plant stress. Among the vegetation indices, MCARI performed better than NDVI, PRI, NDRE and SR for the detection of early and late infestation of BPH. Hence, hyperspectral reflectance from rice has been used to detect pest damage and improve management policies.Keywords
Brown planthopper, hyperspectral sensor, Plant stress, rice, vegetation indices.Full Text
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