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Pathogenicity and growth rates of Phytophthora drechsleri isolates from safflower and sugarbeet



Pathogenicity and growth rates of Phytophthora drechsleri isolates from safflower and sugarbeet



Plant Dis Reporter 49(4): 293-296



In greenhouse inoculations, each of two sugarbeet isolates and three safflower isolates of Phytophthora drechsleri incited root rot of safflower and seedling blight and root rot of sugarbeet. At 18[degree]C all isolates showed rapid growth on lima bean agar. At 35[degree], however, the two sugarbeet isolates and safflower isolate 58-11 showed limited growth, while the other safflower isolates showed rapid growth. Both sugarbeet isolates were similar in virulence and paralleled the specific pathogenicity of safflower isolate 58-11 to safflower and sugarbeets, but they exhibited less total virulence than safflower isolates 45116 and 201.

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