3 RESULTS
3.1
Pre-infestation of rice by BPH female adults reduced subsequent BPH
attack
We performed choice and no-choice tests to investigate whether
pre-infestation of rice plants by BPH gravid female adults influenced
subsequent BPH infestations. In the choice test, BPH nymphs and female
adults preferred un-infested rice
plants to pre-infested ones (Figure 1a, b). In the no-choice test, the
survival rate of nymphs was relatively lower on pre-infested rice than
on un-infested rice (Figure 1c).
The amount of honeydew excreted by BPH in pre-infested rice was
significantly lower than that in control rice (Figure 1d).
Pre-infestation by BPH gravid females therefore increased rice
resistance to BPH.