TABLE 3 .

Average aggressiveness and ice nucleation activity phenotypes of strains of P. syringae in waters from different origins

Sourcea	No. of strains	Aggressivenessb	Ice nucleation activityd
0	13	1.64 (A)c	−6.2 (AB)e
10.1	15	0.08 (C)	−7.2 (B)
10.2	14	1.68 (A)	−4.7 (A)
11.1	14	0.23 (C)	−7.1 (B)
11.2	10	0.72 (ABC)	−5.2 (A)
12	11	0.29 (BC)	−6.3 (AB)
21	13	0.13 (C)	−6.1 (AB)
22	15	1.10 (ABC)	−5.3 (A)
33	10	1.56 (AB)	−5.8 (AB)
37	10	0.48 (ABC)	−4.9 (A)
40	10	0.64 (ABC)	−5.8 (AB)
42	70	1.02 (ABC)	−5.4 (A)

^a Sources are described in Table 1. Phenotypes of strains from site 43 were not determined.

^b Shown is the overall mean disease severity (on a scale of 0 to 4), for all strains tested per source, as indexed on 12 cantaloupe cotyledons per strain.

^c Mean severity values followed by the same letters were not significantly different (P ≤ 0.05) based on Tukey’s honest significant difference test.

^d Shown is the overall mean temperature, for all strains tested per source, at which ice nucleation was induced by the suspensions of 10⁶ cells tested per strain.

^e Mean temperatures followed by the same letter are not significantly different (P ≤ 0.05) based on the least significant difference test. (No significant differences were revealed with Tukey’s honest significant difference test.)