Simulation of brown planthopper damage mechanism on rice

H. Mohd. Norowi

Abstract

A comprehensive rice growth model, ORYZABPH was developed to quantify the damage mechanisms of brown planthopper (BPH) on rice growth. The model was adopted from ORYZA1 model. It was calibrated and evaluated for predicting rice variety MR 84 growth under local conditions through several experiments conducted in Seberang Perak. The test on goodness of fit demonstrated that the model is capable to predict all rice growth components, except for weight of green leaves. Simulation results indicate that the model may be used to predict rice growth with and without BPH infestation under Malaysian condition. The model suggests that BPH feeding may cause two types of damage to rice. First, BPH feeding directly removes assimilate that results in reduced crop growth. Second, BPH feeding activity may cause serious damage to rice. The model can be used to study the possible strategies that can be employed to reduce rice yield loss due to BPH infestation.

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