?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Organic+Centre+Wales+Technical+Note+6%3A+Biology+and+management+of+leatherjackets&rft.creator=Anon%2C+&rft.subject=Crop+health%2C+quality%2C+protection&rft.subject=+Education%2C+extension+and+communication&rft.subject=+Production+systems&rft.description=Leatherjackets+are+the+larvae+of+crane+flies+(Tipula+spp.)+which+are+better+known+as+daddy+longlegs.+The+largest+populations+are+found+in+grassland+and+populations+in+infested+fields+can+reach+0.6+million+leatherjackets%2Fha.+The+threshold+population+for+field+crops+is+0.25+million%2Fha.+Crops+of+brassicas%2C+courgettes+and+roots+following+grass+may+suffer+most+damage.+Damage+is+usually+seen+in+spring+with+young+plants+and+seedlings+the+worst+affected.++This+technical+note+discusses+natural+enemies+of+leatherjackets%2C+nature+of+damage%2C+life+history+and+control+measures%2C+and+a+list+of+sources+of+further+information.&rft.date=2005-09&rft.type=Other&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F10809%2F1%2F6leatherjackets-eng.pdf&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F10809%2F2%2F6leatherjackets-cym.pdf&rft.identifier=Anon%2C+(2005)+Organic+Centre+Wales+Technical+Note+6%3A+Biology+and+management+of+leatherjackets.&rft.relation=http%3A%2F%2Forgprints.org%2F10809%2F