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Adult predators were confined with rice plants bearing different densities of brown planthopper (BPH) eggs and numbers of eggs remaining recorded after 24 hr. A: water (control); B: T. erecta; C: S. indicum; D: P. grandiflora; E: A. conyzoides; F: T. procumbens; G: E. sonchifolia; H: comparison of fitted curves for all treatments.
