Confirmation of the insect vector transmitting Phytoplasma sp. associated with Peach yellow disease and detection of the Phytoplasma sp. in vector Three-dimentional distribution pattern dynamics of Erythroneura sudra and its natural enemy Erigonidum graminicola Geostatistical analysis on spatial patterns of Erythroneura sudra and Erigonidium graminicola Study on the Selective Effect of Misumenops tricuspidatus to Erythroneura sudra and Hyalopterus amygdali