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一、紫纹羽病的发生条件 1、土壤条件: ①李树栽植在开垦时间短,未熟化的土壤上易发生紫纹羽病。开垦后3～5年为发生的最盛期,经调查发现在这发生盛期的李树栽培区紫纹羽病向白纹羽病转变的也较多。②该病常发生在土壤团粒大、排水好、易干燥、通气性好的倾斜地与河川堤防附近的砂质地。该病的最适土壤水分为20％左右,并且在浅层土壤上发生的多。③该病在有机质含量多的土壤上易发生,施用有机质肥料(堆、厩肥)及未分解的残留
First, the purple line feather disease conditions 1, soil conditions: ① plum planting in the reclamation time is short, uncured soil prone to purple line feather disease. After the reclamation of 3 to 5 years for the peak period occurs, the survey found that in the peak of the occurrence of plum cultivation purple chameleon disease to white-striped feather disease change more. ② The disease often occurs in large soil aggregates, good drainage, easy to dry, good ventilation and inclined to the river near the embankment sand texture. The optimum soil moisture of the disease is about 20%, and the occurrence of more in shallow soil. ③ The disease is prone to soil organic matter content, the application of organic fertilizer (heap, manure) and undecomposed residues