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#1
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Raspberry Beetle
Hi
Last year my crop of late fruiting raspberries were almost ruined by a miserable little whitish yellow grub getting into the fruit. I believe the pest is Raspberry Beetle and that you should spray around fruiting time to prevent. The canes were a gift some time ago, they grow well, and the fruit is delicious - IMHO better than the more popular earlier varieties. I think they are Autumn Bliss but they are 'lost label'. Could you please advise what to spray with and when and possibly how to prevent. I know you are all very helpful folk and look forward to some expert advice and more mouthwatering fruit. Brian |
#2
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Raspberry Beetle
On Thu, 12 Jun 2003 19:40:05 +0100, "brimon"
wrote: ~Hi ~ ~Last year my crop of late fruiting raspberries were almost ruined by a ~miserable little whitish yellow grub getting into the fruit. ~I believe the pest is Raspberry Beetle and that you should spray around ~fruiting time to prevent. ~The canes were a gift some time ago, they grow well, and the fruit is ~delicious - IMHO better than the more popular earlier varieties. ~I think they are Autumn Bliss but they are 'lost label'. ~Could you please advise what to spray with and when and possibly how to ~prevent. Derris (rotenone) is a recommended spray or powder for raspberry beetle. It's sort-of organic, as it can be used 'as a last resort' for several things eg flea beetle, but the official HDRA organic solution is to remove mulches and rake the ground around canes after fruiting in the autumn so the birds can get in and eat the overwintering adult beetles. Also to introduce chickens! In bad cases, cut canes to ground so there will be no fruit and therefore no adults, but of course you lose a crop. The non-organic option (RHS fruit and veg gardening) is bifenthrin spray. Both control sprays should be applied at dusk when the fruits just show some pink, in order to minimise damage to beneficial pollinating insects. ~I know you are all very helpful folk and look forward to some expert advice ~and more mouthwatering fruit. Good luck. I'll be out there with my derris soon... -- jane Don't part with your illusions. When they are gone, you may still exist but you have ceased to live. Mark Twain Please remove onmaps from replies, thanks! |
#3
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Raspberry Beetle
In article , jane jane@moonrose.
demonmapson.co.uk writes Derris (rotenone) is a recommended spray or powder for raspberry beetle. It's sort-of organic, as it can be used 'as a last resort' for several things eg flea beetle, but the official HDRA organic solution is to remove mulches and rake the ground around canes after fruiting in the autumn so the birds can get in and eat the overwintering adult beetles. IMHO the HDRA organic solution would be by far the best method in the longer term. It tackles the problem on the plant and in the soil, whereas derris/rotenone will only kill off living beetles, leaving infestation in the ground as eggs or pupae to re-appear in subsequent years. The chemicals sprayed will also remain on ripening fruit and will enter the food chain - exactly what organic methods aim to prevent. When a gardener or grower decides to convert from chemical to organic methods, they may need a little help to tackle problems remaining in their plants or soil. Organic standards recognise that and make provision for it by introducing a conversion period, but produce grown during that period cannot be sold to the public as organic. HDRA guidelines for recreational organic gardening give qualified acceptance to certain methods and materials to help gardeners through conversion. Those are only intended to be used 'as a last resort' as you rightly say, and they are not suitable for regular use in an organic garden. Derris/rotenone is listed as unsuitable amongst many other materials such as Bordeaux mixture, soft soap, Pyrethrum, Quassia, copper based substances, Borax, disinfectants etc. etc. Full details are in the HDRA booklet 'Guidelines for Organic Gardening' available from their website at: www.hdra.org.uk -- Alan & Joan Gould - North Lincs. |
#4
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Raspberry Beetle
"brimon" wrote in message ... Hi Last year my crop of late fruiting raspberries were almost ruined by a miserable little whitish yellow grub getting into the fruit. I believe the pest is Raspberry Beetle and that you should spray around fruiting time to prevent. The canes were a gift some time ago, they grow well, and the fruit is delicious - IMHO better than the more popular earlier varieties. I think they are Autumn Bliss but they are 'lost label'. Could you please advise what to spray with and when and possibly how to prevent. I know you are all very helpful folk and look forward to some expert advice and more mouthwatering fruit. Brian Many thanks to both of you for very full and helpful advice. I now know how these beasties operate and will try to prevent them overwintering. Might have to resort to derris this year but hope not. Powdered root is not exactly chemical -although I do strive to follow the organic path. I also do like raspberries and always very thoroughly wash them after picking. Thanks again Brian |
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