Study On The Occurrence And Pathogen Of Apricot Tree Gummosis In Xinjiang

Apricot has more than1,400years history of cultivation in Xinjiang. Area and outputranked first in China, the fruit quality is excellent, and breed is very rich in resources. Apricotgummosis is one of the main diseases in apricot. The disease is widespread occurrenced inapricot cultivation area such as Kashi, Aksu, Hotan and Bayinguoleng Mongolia Autonomons.We investigate the incidence of apricot gummosis, occurrence patterns of apricot gummosis,and isolated pathogens of apricot gummosis in parts of Xinjiang. The main results are asfollows.Apricot gummosis is widespread occurrence in southern Xinjiang apricot cultivation. Weinvestigate the incidence of apricot gummosis and hazard survey in Luntai Bayinguoleng Mo--ngolia Autonomons, Kuche Aksu, Hotan Pishan and moyu in hetian, and Shule, Yengisar inKashgar. We found that the onset of strain rate and disease index is generally high. The highe--st incidence is95.9%in Kashgar, the lowest90.9%in Bayinguoleng Mongolia Autonomous.The highest disease index is58.9in Aksu, the lowest33.6in Bayinguoleng Mongolia Auton--omous.Symptoms of apricot gummosis and apricot gummosis occurrence survey are carried outsimultaneously. The field survey found that gummosis can arise both in young apricot treesand mature apricot trees. Gummosis occurs mainly on the young trees trunk and the adulttree trunk, the main branch, lateral branches, twigs and fruit. The trunk and the main branch ismore serious. There are two type of gummosis that is wound gummosis. Worm holes, barkcracks, the wounds caused by pruning and grafting, and the injury caused by humans andanimals can cause wound gummosis.We investigate the apricot gummosis change trend within the year in Kuche, Luntai andXinjiang Agricultural University campus. The result of investigation show that apricotgummosis in southern Xinjiang is earlier than the northern apricot gummosis one month.Apricot gummosis occurred in April to October, from June to September become severity,with a yearly peak in July or August, after September gummosis gradually reduce and stopgumming in November or December.We investigate the relationship of apricot gummosis with rainful and temperature inKuche in2010-2011. The result show that the incidence and disease index of apricotgummosis is a significant positive correlation with temperature. And it is a positivecorrelation with rainful. In addition, apricot gummosis is closed to the tree age and vigor, siteconditions and the level of cultivation and management, planting density.Apricot gummosis pathogen isolation is tissue isolation. We collect the disease samplesfrom Bayinguoleng Mongolia Autonomons, Hotan, Kashgar, Aksu. The result of isolation isapricot gummosis in Xinjiang more than90%is non-infectious gummosis, andinfectiousgummosis is caused by Fusarium sp. and Alternaria sp.