Not AvailableThe impact of elevated CO2 (570 25 ppm) on brown
planthopper, Nilaparvata lugens (Stål) and Pusa
Basmati 1401 rice in comparison to ambient CO2 was
studied in open top chambers (OTCs) during the rainy
seasons of 2013 and 2014. Crop canopy circumference
was higher (13.1–16.8 cm) under elevated CO2 when
compared to ambient CO2 (10.3–13.1 cm) during
different rice phenological stages indicating the positive
influence of elevated CO2. In addition, elevated
CO2 exhibited a positive effect on rice plants through
increase in tiller number (17.6%), reproductive tillernumber (16.2%), number of seeds/panicle (15.1%)
and thousand grains weight (10.8%) that resulted in
higher grain yield (15%) when compared to ambient
CO2. Elevated CO2 also exhibited a positive effect on
brown planthopper population through increase in
fecundity (29% and 31.6%) which resulted in a significant
increase in its population to 150.3 16.4 and
97.7 8.7 hoppers/hill at peak incidence during 2013
and 2014 respectively, when compared to the corresponding
49.1 9.3 and 43.7 7.0 hoppers/hill under
ambient CO2. Moreover, brown planthopper females
excreted more honeydew (68.2% and 72.3%) under
elevated CO2 over ambient CO2 during both years.
However, elevated CO2 caused reduction in the longevity
of females (23.9–27.4%) during both years and
male longevity (24.1%) during 2013. Despite the positive
effect, rice crops suffered higher yield loss under
elevated CO2 (29.9–34.9%) due to increased brown
planthopper infestation coupled with higher sucking
rate due to reduced nitrogen level under elevated CO2
compared to ambient CO2 (17–23.1%) during 2013
and 2014.Not Availabl