Abstract: henology of calytratae flies in western Sichuan Province was studied during 1982-1994. The results showed that the adult flies present in all seventy two periods of phenology in a year, There are two types of flies, the cold taxis type and the thermotaxis type. The phenological phenomena of the cold taxis type of the most flies could be observed in a year round; some phenological phenomena begin from the year and lasted until next year. A few species have two times cycling in a year . The phenological phenomena of the flies species of the thermotaxis type showed in a year round and few species lasted to the next year. According to 265 phenological phenomena observed, Elaeagnus pungens is belonged to cold taxis type species while Pyracantha fortuneana is belonged to thermotaris type species of flies phenological phenomena. It was found that flowers Pimpinella diversifolia was the most attractive to the flies.

Key words: under-mulch partitioning alternate drip irrigation, cotton, dry matter accumulation, nitrogen utilization, coupling effects of water and nitrogen.