All the P -values of the tests are at least smaller than 0.0069 (sample sizes: n 1 =15 abundant sites versus n 2 =3 low-density sites), except for April when field observations started ( P =0.37; sample size: n 1 =15 versus n 2 =3), indicating highly significant differences between the two populations.
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The effect of soil-borne pathogens depends on the abundance of host tree species.
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