Poor germination or stand development can indicate pre-emergence damping-off where seeds rot in the media prior to emergence above ground. No germination in a verbena row to the right while other seeds to the left have germinated.
Cause The fungi or fungus-like microorganisms, Pythium spp., Fusarium spp., and Rhizoctoniasolani, attack young seedlings of many vegetables, including members of the genus Brassica. These soilborne microorganisms can persist indefinitely in soil or plant debris. If seedlings are affected before emergence, it appears as poor germination.
Cause Deficiency or unavailability of boron in the soil and subsequent deficiency in the plant. All vegetables require boron for growth, but the amount required varies considerably. Turnip, rutabaga, and cauliflower are sensitive to boron deficiency, which is common in soil that is alkaline or sandy and subject to excessive leaching. In any soil, boron also may become less available during long droughts.
