Survival of Southern Highbush Blueberry Cultivars in Phytophthora Root Rot-Infested Fields in South Mississippi

Figures & data

TABLE 1 2005 Study 1: Vigor Score, Number, and Percentage of Plants Dead on August 16, 2005 of Eight Southern Highbush Cultivars Transplanted in February 2005

Cultivar	N	Score ^z	% Dead	Bed height	N	Score
Star	68	4.46 a	0.1	Raised	127	3.6
Misty	36	4.08 ab	8.3	Flat	128	3.6
Jubilee	37	3.86 ab	10.8	P > F		0.40
Biloxi	19	3.63 abc	21.1
Sunshine	19	3.53 bc	21.1	Soil amendment
Sharpblue	19	2.79 cd	31.6	None	16	3.9
Southmoon	37	2.59 d	45.9	Peat	130	3.7
Ozark Blue	20	2.30 d	45.0	Bark	109	3.5
P > F		0.0002		P > F		0.31
^zValues in a column followed by the same letter are not statistically different based on Fisher's protected least significant difference (α = 0.05). P value represents the probability of observing a greater value in the F test.

FIGURE 1 Plant vigor ratings of five southern highbush blueberry cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2005. LSD (P = 0.05). 2005 = 0.91, 2006 = 1.28, 2007 = 1.21, 2008 = 1.10, 2009 = 1.10.

FIGURE 2 Average effect of bed height and soil amendment on plant vigor ratings of five southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2005. LSD (P = 0.05). Bed height: 2005 = 0.6, 2006 = 0.7, 2007 = 0.7, 2008 = 0.6, 2009 = 0.6; Soil amendment: 2005 = 0.9, 2006 = 1.2, 2007 = 1.1, 2008 = 1.1, 2009 = 1.0.

FIGURE 3 Interaction of bed height and soil amendment on plant vigor ratings of five southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2005. LSD (P = 0.05). 2005 = 0.87, 2006 = 1.23, 2007 = 1.16, 2008 = 1.05, 2009 = 1.05.

FIGURE 4 Plant vigor ratings of ten southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2006. LSD (P = 0.05). 2006 = 1.19, 2007 = 1.16, 2008 = 1.10, 2009 = 1.00.

FIGURE 5 Average effect of bed height and soil amendment on plant vigor ratings of ten southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2006. LSD (P = 0.05). Bed height: 2006 = 0.4, 2007 = 0.4, 2008 = 0.4, 2009 = 0.3; Soil amendment: 2006 = 0.8, 2007 = 0.7, 2008 = 0.7, 2009 = 0.6.

FIGURE 6 Interaction of bed height and soil amendment on plant vigor ratings of ten southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2006. LSD (P = 0.05). 2006 = 0.72, 2007 = 0.70, 2008 = 0.64, 2009 = 0.57.

FIGURE 7 Effect of bed height and soil amendment on plant vigor ratings of two southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2007. LSD (P = 0.05). Bed height: 2008 = 0.64, 2009 = 0.57; Soil amendment: 2008 = 0.95, 2009 = 0.85; Cultivar: 2008 = 0.79, 2009 = 0.70.

FIGURE 8 Effect of soil amendment on plant vigor ratings of 12 southern highbush cultivars established in a field infested with Phytophthora cinnamomi in south Mississippi in 2008. LSD (P = 0.05). Cultivar: 2009 = 1.27, 2010 = 1.66; Soil amendment: 2009 = 0.52, 2010 = 0.68.