Differences Between the Strength of Preference-Performance Coupling in Two Rice Stemborers (Lepidoptera: Pyralidae, Crambidae) Promotes Coexistence at Field-Plot Scales.

摘要: Two stem-boring moths, the yellow stemborer (YSB) Scirpophaga incertulas (Walker), and striped (SSB), Chilo suppressalis damage rice in Asia. YSB is dominant species much of tropical Both are oligophagous on domesticated wild rice. We investigated roles host plant preferences larval performance determining densities both plots. In screenhouse experiments, showed significant preference-performance coupling. Adults preferred high-tillering varieties during early vegetative growth. contrast, SSB did not demonstrate oviposition under same conditions, but oviposit less Oryza rufipogon Griff. than a choice experiment. Despite differences coupling, survival biomass across 10 were correlated between two species. larvae occurred relatively high numbers with large tillers (IR70, IR68, T16) wet dry season field experiments. However, whereas was IR68 IR70, it abundant T16, where dominated. Results suggest that preferentially attacked fast-growing tiller crop cycle. Meanwhile SSB, which has weak plants free later These factors may allow to coexist. discuss implications proximate ultimate influencing co-occurrence for sustainable production