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Assessment of Application Timing of Bacillus spp. to Suppress Pre- and Postharvest Diseases of Apple

机译:芽孢杆菌属施药时间的评估。抑制苹果收获前和收获后的疾病

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Poleatewich, A. M., Ngugi, H. K., and Backman, P. A. 2012. Assessment of application timing of Bacillus spp. suppress pre- and postharvest diseases of apple. Plant Dis. 96:211-220. Four isolates of Bacillus spp. were tested in a 2-year field study for biological control of pre- and postharvest diseases of apple. For the preharvest test, bacteria were applied to 'Golden Delicious' and 'Rome Beauty' trees in May or May and June. Foliar apple scab severity was assessed weekly. After harvest, fruit were wounded and then either left untreated or given a postharvest application of the bacteria. Wounded fruit were then inoculated with the bitter rot pathogen and lesion size was measured over 8 days. Bacillus megaterium isolate A3-6, B. mycoides isolate A1-1, and B. cereus isolate FLS-5 applied in May or May and June significantly reduced fruit and foliar apple scab severity in both years. A postharvest application of the bacteria (alone or in combination with a preharvest application) resulted in the greatest suppression of bitter rot on both cultivars (P < 0.04). The May + June + postharvest application of isolate A3-6 resulted in the greatest suppression of bitter rot, with an average of 45 and 95% reduction in lesion size compared with nontreated controls on 'Golden Delicious' and 'Rome Beauty' fruit, respectively. Results from this study indicate that preharvest applications of the bacteria were able to reduce foliar and fruit scab and an additional postharvest application was effective in reducing bitter rot severity.
机译:Poleatewich,A. M.,Ngugi,H. K.和Backman,P. A.2012。评估芽孢杆菌属菌种的施药时间。抑制苹果收获前和收获后的疾病。植物病96:211-220。芽孢杆菌属的四个分离株。在一项为期2年的田间研究中测试了苹果收获前和收获后疾病的生物学控制。为了进行收获前测试,在5月或5月和6月将细菌施用到“黄金美味”和“罗马美女”树上。每周评估叶面苹果结ab的严重程度。收获后,果实受伤,然后要么未经处理,要么在收获后施用细菌。然后,用苦腐病原菌接种伤痕累累的水果,并在8天之内测量病灶大小。在5月或5月和6月使用的巨大芽孢杆菌分离物A3-6,霉菌芽孢杆菌分离物A1-1和蜡状芽孢杆菌分离物FLS-5在这两年中均显着降低了果实和叶片苹果黑星病的严重程度。细菌的收获后施用(单独或与收获前施用结合使用)可最大程度地抑制两个品种的苦腐(P <0.04)。分离物A3-6的五月+六月+收获后施用可最大程度地抑制苦味腐烂,与未处理的“金美味”和“罗马美人”水果对照相比,病变大小分别平均减少了45%和95% 。这项研究的结果表明,该细菌的收获前施用能够减少叶片和果实结ab,另外收获后施用可以有效降低苦腐的严重程度。

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