STUDY ON THE SPATIAL DISTRIBUTION PATTERN OF ADULT OF STRIPED FLEA-BEETLE(COLEOPTERA:CHRYSOMELIDAE)

The spatial distribution pattern of the adult of the striped flea-beetle, Phyllotreta striolata Fabricius, on vegetable fields were studied. The results showd that:(a)The spatial distribution of the insect pest confotmcd to negative binomial distribution and Neyman distribution.(b)The spatial pattern of the pest is an aggregative one and the basic component of distribution is the colony.(c)In the afternoon, on the Chinese cabbage and the flowering cabbage 81% of the pest concentrate on the youngest leaf and 2 leaves around it, and on the radish the greater pars of the pest concentrate on the back of the leaves.