Figure 1. Behavioural responses of white-backed planthoppers (WBPH) and brown planthoppers (BPH) to volatile cues from healthy and virus-infected plants.

In pair-wise choice tests conducted using a Y-tube olfactometer, SRBSDV-infected (a) and RRSV-infected (b) rice plants were compared with healthy plants during disease progression. Virus-free and viruliferous planthoppers were evaluated separately. Data were analysed by generalized linear models and are presented as the mean ± standard error. Data are arranged vertically by the pairs involved in each choice test. *p < 0.05 and **p < 0.01 for pair-wise comparisons.