Character Isolate Species average
57J1 57J2 57J3 57J4
Shape (%)          
ovoid to obpyriform 86 93 96 90 92
slightly ellipsoid 12 7 4 2 6
distorted 1 - - 8 2
Papilla (%)          
nonpapillate 66 70 53 69 64
semipapillate 33 30 47 31 36
Size range (µm) 47.3-70.0 x 21.1-43.3 48.8-64.3 x 26.8-38.6 55.4-71.9 x 28.6-41.9 47.3-77.3 x 20.4-37.1 47.3-77.3 x 20.4-43.3
Average size (µm) 61.5 ± 7.2 x 34.0 ± 3.5 57.4 ± 3.9 x 31.1 ± 2.5 62.6 ± 3.8 x 34.9 ± 3.2 60.3 ± 7.2 x 26.8 ± 3.4 60.4 ± 6.0 x 31.3 ± 4.5
L:W ratio 1.82 1.85 1.80 2.27 1.96
Table 3: Morphological variations of sporangial characters among isolates of Phytophthora mississippiae in this study.