Collar
rot or crown rot
Collar rot or crown rot is
normally caused by Phytophthora, there are many species of Phytophthora, a
common, widely distributed, soil borne fungus with a very wide host range, attacking
about 200 different species of plants in over 80 genera. It is a serious
disease of certain cultivars of poppies. The disease is primarily a problem on sites that
are poorly drained or are irrigated by flooding. High soil moisture and soil
temperatures 20°C and above are essential for the survival and movement and infection
of the Phytophthora fungus.
There is apparently nothing available
on the market for the amateur gardener, thus nothing that can be done about the
infected soils, but I have found that not all verities of poppy are susceptible
to the fungal attack, but it can be very distressing to see an entire patch of
nice healthy young poppies keel over and die, and there is nothing that can be
done about it.
Pegomya hyoscyami 'Beet leafminer'
Attacks henbanes, nightshades
and poppies, no cure, except finding the maggots and killing by hand one by
one, makes a real mess of the leaves but seed production seems to be
unaffected.
‘Bird damage’
Seems to happen towards the end
of the summer, birds will attack the pods and eat the seeds inside.
'Poppy pod and seed loss'
Living in the north east of England,
we tend to have short summers and they are nearly always wet towards the end of
the summer, this is bad news if you are waiting for large poppy pods to dry on
the plant. I have encountered two main problems with wet weather, one is the
seeds can germinate inside the pod, and second the whole pod rots to mush.
The key is to cut the pods as
soon as they start to turn yellow, give them a tip and if you can hear the
seeds rattle inside, cut them down, and then hang them upside down in a dry
place.
Pegomya hyoscyami 'Beet leafminer'
Attacks henbanes, nightshades
and poppies, no cure, except finding the maggots and killing by hand one by
one, makes a real mess of the leaves but seed production seems to be
unaffected.
‘Bird damage’
Seems to happen towards the end
of the summer, birds will attack the pods and eat the seeds inside.
'Poppy pod and seed loss'
Living in the north east of England,
we tend to have short summers and they are nearly always wet towards the end of
the summer, this is bad news if you are waiting for large poppy pods to dry on
the plant. I have encountered two main problems with wet weather, one is the
seeds can germinate inside the pod, and second the whole pod rots to mush.
The key is to cut the pods as
soon as they start to turn yellow, give them a tip and if you can hear the
seeds rattle inside, cut them down, and then hang them upside down in a dry
place.
Are there any varieties that you sell, besides Bush, that are resistant to collar rot? I had good results with the Bush poppies in the past but I see this is an ongoing problem with my soil for other varieties.
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