Rod wrote:
On Thu, 15 Jul 2004 18:45:00 +0100, (sarah)
wrote:
I've got summer broccoli, miniature kohlrabi[1] and miniature Savoys,
all of which are showing mottled yellow patches on some leaves on some
plants. The patches bear no apparent relationship to water droplets or
anything else, and the affected plants have an indefinable air of being
under the weather. Could this be a virus, or is it some deficiency I
could do something about? Watering with dilute seaweed extract didn't
significantly cheer them up.
These patches usually appear after attack by grey cabbage aphids and
is worse after periods of stress - like hot dry weather. I believe
they are symptoms of a virus but given good growing conditions they
can grow out of it to some extent. The grey aphids are worse in hot
dry conditions. If you start your plants under glass, that's when the
aphids get going so get your plants outside and hardened off a bit
quicker next time. Keep an eye on those young plants and hit the
aphids with a soap type insecticide as soon as you see any signs.
Thanks, Rod, that makes sense. I haven't got glass, but there are a lot
of grey aphids on the brassicas anyway; I'm in East Anglia, and despite
the grey days we've not had that much rain and the lawn is still brown.
I've been watering the vegetables daily, but perhaps not enough.
regards
sarah
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