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1982年6-7月,我们在吐鲁番市番茄田中发现番茄根腐疫病;1984年8—9月又在乌鲁木齐市郊过度灌溉的番茄田内发现此病,发病率达50—80%,番茄的产量和质量受到严重影响.1.症状 据观察,大田番茄第一果穗成熟前发病,发病初期个别根部变褐腐烂,顶部叶片中午萎蔫,但早晚仍可恢复;10—15天后主根和多数侧根腐烂,全株叶片萎蔫枯死.土壤和植株间温度较大时,病株茎的中下部生出长短不等的白色气生根.病株输导组织一般不变色,但当被镰刀菌、细菌等二次菌寄生后,根茎10—30厘米的木质部也可变褐.2.病原菌 1982和1984年,我们多次从病株根茎部分离出镰刀菌和细菌,但经回接均未引起健株发病;而从根部分离到的两个疫霉菌株(P84—4和P84—5)分别回接,
From June to July 1982, we found tomato root rot disease in the tomato field of Turpan City. In August-September 1984, we found it in the over-irrigated tomato field in the suburbs of Urumqi, with the incidence of 50-80%. The output of tomato and The quality is seriously affected .1. Symptoms According to the observation, the first ear of field tomato disease before maturity, the early onset of individual root browning rot, the top leaves wilting at noon, but sooner or later still be restored; 10-15 days after root rot and most lateral root rot, all Plant leaves withered wilt.When the temperature between the soil and plants larger, the lower part of the diseased stems give rise to different lengths of white aerial roots.Transgenic tissues of the diseased plants generally do not change color, but when Fusarium, bacteria and other secondary bacteria parasitic After 10-30 cm roots of the xylem can be brown .2. Pathogenic bacteria 1982 and 1984, we repeatedly from the diseased rhizome part of the Fusarium and bacteria, but did not lead back to the pathogenesis of health; from The two Phytophthora strains isolated from roots (P84-4 and P84-5)