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cab
Joined: 01 Nov 2004 Posts: 32429
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Blacksmith
Joined: 25 Jan 2005 Posts: 5025 Location: Berkshire
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gil Downsizer Moderator
Joined: 08 Jun 2005 Posts: 18409
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Posted: Mon May 01, 06 6:20 pm Post subject: |
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Blackfly infestation or otherwise depends on 2 things
Edited (after consulting Lampkin on organic farming) :
a) time of sowing : Autumn sowings are less prone to it because by June the following year, the tops are tough enough to not appeal to blackfly. Spring sown broad beans are particularly prone to attack, because when the blackfly arrive in JUNE, the beans have nice tender bushy tops. If you sow late in spring (like up here, when a mid-May sowing is possible), your beans may avoid blackfly, as their tops will not yet be sufficiently developed to attract the fly.
b) Place to land and infest : pinching out the bushy tops does seem to help. Do as soon as the tops are bushy, before June (if your broad beans have tops by then).
Blackfly danger dates : June.
Or pick / water them off. They don't like washing up water much, but they are tenacious little so-and-sos.
Lampkin recommends sowing barley on the headlands (areas at ends and sides of field) to protect commercial broad bean crops sown on a field-scale, as it has some effect in stopping blackfly coming in from outside the field. He does not say why this works [is it a barricade effect ? or do they land on the barley instead as a sacrifice crop ? or does the barley in some way repel them ?]
Last edited by gil on Thu May 04, 06 11:06 am; edited 1 time in total |
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Blue Sky
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Bernie66
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dpack
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Blue Sky
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dpack
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cab
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wishus
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Blacksmith
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corinne
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dpack
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hedgehogpie
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