Delineation of Vulnerable Zones for YSB Attacks under Variable Temperatures Using Remote Sensing and GIS
Delineation of Vulnerable Zones for YSB Attacks under Variable Temperatures Using Remote Sensing and GIS
Syed Muhammad Hassan Raza1*, Syed Amer Mahmood1, Veraldo Liesenberg2 and Syed Shehzad Hassan1
ABSTRACT
The spatiotemporal changes in temperature are a main cause for a shift in crop phenology as well as failure of crop calendar. Yellow stem borer (YSB) is an insect pest of rice crop that may reduce rice yield about 20% due to the use of insecticide at inappropriate times and unsuitable locations following the crop calendar. The purpose of this research was to delineate the vulnerable zones for YSB attacks on rice crop using satellite thermal datasets. The area under investigation was 13700 km2 area out of which 8627 km2 was covered by rice plantations. Thermal datasets covered the area of 8627 km2 comprising 10663 pixels which returned 10663 spatially distributed temperature values. Six, thermal datasets were obtained for the duration between (April 03-June 22) 2014, with a temporal window of 16 days to delineate YSB vulnerability from egg laying to pupa evolution stage. The results obtained highlight that 73% of the investigation area were venerable for a female YSB to lay 100-143 eggs on April 03, that increased up to 96% to lay 148-176 eggs on April 19, due to increase in temperature. On May 05, about 5377 km2 area was found in egg hatching phase, on May 21, 1514 km2 area was found in larva evolution phase and on June 22, 1725 km2 area was found in pupa evolution phase. The results proved that satellite technology is an efficient and cost-effective tool to demarcate the vulnerable zones to YSB attacks and to take remedial measures accordingly
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