A preliminary study on the occurrence regularity of Acalitus phloeocoptes(Nalepa) in apricot orchard

【Objective】 The light ones are unable to blossom and leaf buds, and the heavy ones are dead, which has posed a serious threat to the healthy development of apricot industry in Luntai County. In view of this situation, it is urgent to clarify the causes of the gall, the occurrence, transfer and diffusion of the Acalitus phloeocoptes (Nalepa), and determine the best control time. 【Methods】 Microscopic examination was performed in the gall chamber of the apricot bud, and the damage symptoms and the dynamics of the gall factors were recorded in the field. Adhesive tape was pasted between old and new branches and armyworm boards were hung at different heights, directions and distances from tree crowns to record the transfer and harm laws, propagation modes and propagation distances of gall factors. 【Results】 Micro examination of the bud gall found the damage of the apricot bud to a gall mite, which caused the proliferation and aberration of the gall was identified as Acalitus phloeocoptes (Nalepa). the gall mite In Lutai County, Xinjiang Region, the mite mainly overwintering in gall bud young apricot scales leaves accounted for 95.91% of the total survey; In the middle of apricot blossom in late March of the next year, the overwintering adult mites began to sting, and in early April, the adult mites began to lay a large number of eggs, the oviposition peak of the gall mite was from late April to early May, the peak of adult and nymites was mid-to-late May. As temperatures dropped by the end of September, adult mites prepared for overwintering. It was observed that the gall mite began to crawl and transfer from bud to bud in early May, and the transfer peak was in late May. The results showed that wind was the main passive transmission medium of the gall mites, which helped it to spread over a long distance, with the furthest distance reaching 15 m. The amount of mites trapped by armyworm plates at different heights was different: windward side > leeward side. 【Conclusion】 The gall of apricot bud is caused by the infection of Acalitus phloeocoptes (Nalepa), and the adult mites overwinter in the inner layer of gall bud. The gall occurs from the end of March to the end of September in Luntai County, Xinjiang, with more than 10 generations occurring in a year, and the damage is more serious in April, May and June. Late May is the peak of its transfer, and this stage is the best time for chemical control.