Seed transmission, over wintering and survival of Pseudomonas syringae pv.
glycinae on processing soybean were evaluated as well as the spread of the bacteria
on alternative host and non-host plants. The bacteria were transmitted at a low rate
from soybean seeds to the seedlings. Bacterial density in seeds obtained from
systematically infected plants ranged from 110 to 115 cfu/g seed. Surviving bacteria
associated with infested soybean debris were found in a higher number when debris
was on soil surface compared to the buried debris. Population of the bacteria on
alternative host and non-host plants ranged from 0 to 108 cfu/g fresh weight on
leguminous plants and from 0 to 100 cfu/g fresh weight or: non-leguminous weeds.
The bacteria were not detected in naturally infected soybean seeds when soaked in
0.5% Hcl for 5 hours, 0.25% or 0.05% acidified cupric acetate for 2 minutes or in hot
water (50-55°C) for 20-30 minutes. Hot water treatment had significantly improved
seed germination. Other treatments were ineffective in inhibiting the bacteria and have
varied effects on germination.