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Oligochroa cantonell is a important insect pest on Avicennia marina community. Room feeding can completed 7 generations of a year at Guangzhou, the insect pest period of complete generation need 33～35d from first generation to sixth generation, its period of complete generation need 122d to live through the winter generation. The larva disserves twig or tender leaf or leaf or fruit, the forest of Avicennia marina dried up at graveness hurt. On Avicennia marina community, every place happened rule of harm twig quantity and harm leaf quantity is disaffinity, the quantity of Oligochroa cantonell and the harm twig quantity with leaf a quantity positive related, the harm twig and the harm leaf keep in between 10.8 leaf ( twig ) ～21.5 leaf (twig) / one centiare at a year average, the insect pest amount keep in between 4.4 caput ～20.4 caput / 30 entries one centiare at a year average. The predaceous spider is importance natural enemy to cortrol Oligochroa cantonella , the spider amount of average achieve in between 5.9 caput ～10.8 caput / 30 entries one centiare, Oligochroa cantonella amounts and the spider amounts proportion 1: 0.29-2.45, the comparison that predaceous spider is more high, growing the control function of Oligochroa cantonell population more big, growing ability the break out function of the amount of Oligochroa cantonella more small.
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