The spatial distribution of Cydia pomonella eggs in apple orchards in Gansu Province
In order to accurately determine the population dynamics of the codling moth Cydia pomonella ( L. ) the spatial distribution of codling moth eggs was investigated in apple orchards in Cansu Province. The results indicate that significantly more 2nd generation eggs were found on leaves than on fruit; leaves had 58. 2% of the total amount of eggs. 69. 6% of the total number of eggs found on leaves were on their lower surface. More eggs were found in the southern and eastern sectors of apple trees than in the western and northern sectors, but there was no difference in the amounts of the eggs laid at different levels of the trees. Eggs were clumped in space and the degree of clumping increased with population density. The optimal sampling number was calculated by Taylor' s method.
Cydia pomonellaeggsspatial distribution patternsampling technique
NETL
NSTL
万方数据
维普
