[Objectives]The paper aimed to clarify the relationship between walnut phenology and codling moth occurrence in Hotan area,and to provide a theoretical basis for precise control.[Methods]Phenological observation was carried out regularly in the field from the flowering stage to the ripening stage of the walnut fruit.The three diameters of the fruit were measured with vernier calipers,and the occurrence of various codling moth states was investigated by random sampling method.The relationship between the phenology of walnut and the occurrence of each state of codling moth was also discussed.[Results]The survey on the growth and decline dynamics of codling moth adults found that in late April,when the phenology of'Xinfeng'walnut was the fruit expansion period,and the'Zha343'walnut phenology was the fruit set period,the overwintering adults reached the peak of eclosion.The prevention and control of adult insects could effectively reduce the population density of insects.In late July,when the phenology of'Xinfeng'walnut was the husk turnover period,and the phenology of'Zha343'walnut was the hardcore period,the first generation adults reached the peak of eclosion,and the control of the first generation adults at this stage could be effectively reduce insect population density.The survey on spawning found that from late April to early May,the overwintering adults began to lay eggs,and the walnut phenology was the fruit expansion period(20-30 d after flowering),which was the best period for the control of the first generation eggs.From early May to late May,the oviposition peak of overwintering adults,walnut phenology was the fruit expansion period(30-40 d after flowering),and this was the best period for the control of the first generation of newly hatched larvae.In the first August,the eggs of the first generation adults reached the peak.The phenology of'Xinfeng'walnut was the husk cracking period,and the phenology of'Zha343'walnut was the husk turnover period.This was the best time for the control of the second generation of newly hatched larvae.The investigation of borers found that from early May to early June,the first generation of larvae began to cause damage and reached the peak of damage,and the walnut phenology was the fruit expansion period(40-60 d after flowering).This was the best time to control the first generation of mature larvae.In the first August,the second generation of larvae reached the peak,the phenology of'Xinfeng'walnut was the husk cracking period,and the phenology of'Zha343'walnut was the husk turnover period.This was the best control period for the second generation of mature larvae.[Conclusions]Combined with the walnut phenology,the occurrence dynamics of each stage of codling moth was clarified,which laid the foundation for the precise control of each stage of codling moth,and then reduced the damage of codling moth to walnut fruit.
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