标题：THE CONTRIBUTION OF SOIL AND CROP DEBRIS INOCULA TO THE
OUTBREAK OF BACTERIAL COMMON BLIGHT IN FIELD BEANS (Phaseolus
vulgaris L) UNDER ZIMBABWEAN CONDITIONS
期刊名称：The Journal of Sustainable Development in Africa (JSDA)
电子版ISSN：1520-5509
出版年度：2008
卷号：10
期号：3
出版社：Institute of Sustainable Development in Africa
摘要：An experiment was carried out to assess the contribution of soil and crop debris inocula to
the outbreak of bacterial common blight in field beans (Phaseolus vulgaris L) in Zimbabwe.
A field, in which beans had been grown the previous season, was planted with three bean
varieties on solarized and unsolarized plots with and without infected bean residues. The
trial was laid as a 3 × 4 factorial experiment in a complete randomized design. Disease
incidence and severity, grain yield, and seed-borne bacterial population were assessed for on
growing plants and harvested seed. Disease incidence and severity were not influenced by
inocula source. The bean variety had significant effects on the incidence of outbreak, but not
on the severity of the disease, with Michigan C20 and Cranberry having higher disease
incidences than Mkuzi. Grain yield of the three varieties were significantly different from
each other, with the Cranberry variety producing the highest yield of 2.008 t/ha compared to
1.33 and 0.956 t/ha for Mkuzi and Michigan C20, respectively. Inocula source affected yield,
with the solarized soil minus debris treatment, giving the highest yield of 2.068 t/ha.
Harvested seed bacterial population was influenced by variety, with Michigan C20 having
the highest population of 6.91 × 104 cfu/ml. The experiment showed that Xanthomonas
phaseoli survives in the soil and crop debris in Zimbabwe. However, soil and crop debris
inocula had no effect on disease incidence and severity, but provided inocula for disease
development. Mkuzi was more tolerant to common bacterial blight than Michigan C20 and
Cranberry.
