Rice brown planthopper, Nilaparvata lugens (Stål) feeding behavior in relation to elevated CO2 and temperature

Feeding behavior of brown planthopper, Nilaparvata lugens (Stål) populations collected from different geographical regions Ludhiana, Nalgonda and West Godavari at three generations 1, 5 and 10 fed on rice plants grown under different CO, and temperature levels 1) Ambient COo@ 380±25ppm + ambient temperature (aCOo+aT), 2) Elevated COo@500±25ppm + ambient temperature (eCOo+aT) and 3) Elevated COo@500±25ppm + elevated temperature (eCOo+eT) in closed CO, chambers was studied. Elevated CO, + elevated temperature increased feeding rate of BPH nymphs while BPH adults showed declined feeding rate. BPH nymphal feeding rate increased with progressive generations while it decreased in BPH adults. Ludhiana adult BPH population showed higher honeydew excretion compared to West Godavari and Nalgonda populations. CO, + temperature levels at progressive generations have varying effects on adults and nymphs of three BPH populations. Biochemical composition of rice plants grown under different CO, levels revealed increased rate of soluble sugars, phenols and decreased rate of reducing sugars, soluble proteins, free amino acids, nitrogen, potassium, phosphorous in elevated CO, + elevated temperature levels compared to ambient conditions. Increased feeding rate of BPH under elevated CO, levels may be to compensate changes in host plant quality i.e., high soluble sugars and low nitrogen.