Abstract:In order to effectively and timely carry out measures for control of codling moth, Cydia pomonella (L.) (Lepidoptera: Olethreutidae) in invaded area and habitats, the occurrence dynamics, spatial pattern, distribution and sampling technique of codling moth eggs were investigated and analysed in the pear orchard in 2008. The results indicated that codling moth produced two generations eggs each year. The peaks of the 1st and the 2nd generations of eggs occurred around on May 21 and July 11 respectively, and followed a uniform distribution pattern and an aggregated distribution respectively. There exists selective differences in eggs codling moth laid on pear leaves and fruits. The amount of eggs on the fruits were significantly more than that on the leaves at the peak of the 1st generation eggs, and extremely significantly more than that on the fruits at the 2nd generation eggs. Eggs on leaves mainly distributes on blade back. The codling moths prefer to oviposit in the middle of the crown of pear tree, followed by upper, and lower. In addition, based on spatial pattern of the 1st generation eggs, the optimal sampling number and sequential sampling table were calculated by Iwao’s method.