The experiment results showed that the adult of Neochetina eichhorniae can feed on a large of leaf, petiole and stem of Eichhornia crassipes, to reduce photosynthesis of plant obviously.

• 控制效果实验表明：水葫芦象甲的成虫可大量取食水葫芦叶片和叶柄及茎杆，明显降低植株光合作用；