The Pest Insects and Analysis of Its Outbreaks' Cause in Futian Mangorove,Shenzhen

The studied results to insects and spiders, which were collected from mangrove of Futian of Shenzhen in 1994 and 1999, are reported 96 species of insects and 7 species of spiders were obtained, of which 37 species of insects, i e 35 8% of known species of insects, are enemies to pest insects in 1994 However, only 53 species of insects and 5 species of spiders were obtained, of which 13 species of insects, i e 24% of known species, are enemies to pest insects in 1999 Shannon_Wiener bio_diversity index H and evenness index J is H\-\{1994\}=2 47, H\-\{1999\}=1 64; J\-\{1994\}=0 54, J\-\{1999\}=0 42. The results showed that the environment in 1999 was worse than in 1994 The outbreak of pest insects in mangrove was due to the very bad environment