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Table 2 Rate of infection in seedlings cultivated under controlled conditions from seeds of head-infected field samples.

From: Oospores of Pustula helianthicola in sunflower seeds and their role in the epidemiology of white blister rust

Sample number Number of seeds germinated out of 50 Rate of infection
1 36 36
2 6 17
3 36 58
4 0 n.m.
5 47 45
6 0 n.m.
7 0 n.m.
8 0 n.m.
9 50 25
10 50 37
11 40 5
12 41 0
13 40 25
14 0 n.m.
15 32 0
16 39 13
17 38 40
Control plants artificially infected with oospores 48 56
Uninoculated control plants 50 0
  1. 1n.m.: seeds were not mature enough for germination. Rate of infection (%) was determined by counting the total number of germinated seeds versus the number of plants showing pustules.