Elmer Wade H
The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504.
Plant Dis. 2000 Aug;84(8):831-834. doi: 10.1094/PDIS.2000.84.8.831.
Sixty-seven samples of asymptomatic asparagus spears (avg. 26.5 spears per sample) were obtained during 1995 and 1996 from 22 retail markets in New Haven County, CT, from three commercial growers in Connecticut, and from experimental field plots in Connecticut and North Carolina. Surface-disinfested basal and apical segments were placed on media selective for Fusarium spp. Eight species of Fusarium were identified among 418 isolates from 1,776 spears. Of these, 30 and 62% were F. oxysporum and F. proliferatum, respectively. The incidence of Fusarium colonization was greater from the basal segments (15.5%) than from apical segments (8.1%). Spears shipped from Mexico, Peru, and North Carolina had higher incidence of colonization by F. proliferatum than spears shipped from California, Washington, or the northeastern United States. In both years, spears purchased during June had the highest incidence of F. proliferatum compared with other months. Since F. oxysporum and F. proliferatum are pathogens and infect asparagus crowns and roots, it is probable that infection originated in the field. The less frequent species were found slightly more often on apical segments than on basal segments.
1995年至1996年期间，从康涅狄格州纽黑文县的22个零售市场、康涅狄格州的三个商业种植者以及康涅狄格州和北卡罗来纳州的试验田获取了67份无症状芦笋嫩茎样本（平均每份样本26.5根嫩茎）。对表面进行消毒处理的基部和顶部切段被放置在对镰刀菌属有选择性的培养基上。从1776根嫩茎的418个分离株中鉴定出8种镰刀菌。其中，尖孢镰刀菌和轮枝镰刀菌分别占30%和62%。镰刀菌定殖的发生率在基部切段（15.5%）高于顶部切段（8.1%）。从墨西哥、秘鲁和北卡罗来纳州运来的嫩茎比从加利福尼亚州、华盛顿州或美国东北部运来的嫩茎轮枝镰刀菌定殖的发生率更高。在这两年中，与其他月份相比，6月份购买的嫩茎轮枝镰刀菌的发生率最高。由于尖孢镰刀菌和轮枝镰刀菌是病原体，会感染芦笋的根茎，感染很可能起源于田间。较不常见的菌种在顶部切段上出现的频率略高于基部切段。
