Integrated control of wheat blossom midge - HGCA

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Fig. 5 S. mosellana pheromone trap catches at Sykes field, Boxworth, 31 May - 4 July 200218161412108pheromoneunbaited642031-May 7-Jun 14-Jun 20-Jun 27-Jun 4-JulThere was a good correlation between timing of midge flight and when wheat was at the susceptible growthstage at Rothamsted (Fig 4). At Boxworth (Fig 5) there appeared to be a more prolonged period of midgeflight activity continuing into the late anthesis growth stage when wheat would no longer be suitable forlarval survival. At both sites the high release vial captured approximately 15 male S. mosellana per trap perday during the peak of midge flight.3.1.3.2. 2003 Pheromone Trap ExperimentsThe S. mosellana sex pheromone, 2,7-nonanediyl dibutyrate, performed well, catching up to 50 male midgesper trap per night during the midge flight peak. Although a dose-response relationship was observed in termsof more male midges being caught with the 5mg loading than the 1mg loading, there was little differencebetween the 5mg and 10mg loadings (Expts. 1A and 1B; Fig 6 & 7). In fact, in Expt 1A slightly more midgeswere caught with the 5mg loading than the 10mg loading. In Expt 1B fewer males were caught with the 5mgloading but prediction of midge flight activity was not compromised. This means that cost could be reducedby using half the amount of material without affecting trap performance56
Fig. 6. Expt 1A 2003: pheromone dose in polyethylene vial2018midges / trap / day1614121086unbaited1mg5mg10mg42016-May 19-May 21-May 23-May 26-May 29-May 02-Jun 05-Jun 09-Jun 16-Junstem elongation ear emergence anthesisFig. 7. Expt 1B 2003: pheromone dose in polyethylene vial60midges / trap / day50403020unbaited1mg5mg10mg10019-May 21-May 23-May 26-May 29-May 02-Jun 05-Jun 09-Jun 16-JunExperiments 7A and 7B (Fig 8 & 9) showed that low purity pheromone (material without the finalpurification step) had reduced activity: catches were similar to those with vials with 100 times lesspheromone and prediction of midge flight was less accurate. Thus, it would seem that the final purificationstep is economically justifiable as the activity of the material is substantially enhanced by it.57
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Project Report No. 363March 2005Pri
Page 3 and 4:
AbstractThe orange wheat blossom mi
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and 14 days after Soissons for the
Page 7 and 8: 1210Time (min)86420treatedcontrol m
Page 9 and 10: 987treatedcontrol6Time (min)5432103
Page 11 and 12: AcknowledgementsFunding for this pr
Page 13 and 14: Table 1. Genotype : wbm interaction
Page 15 and 16: MATERIALS AND METHODSVarietiesExper
Page 17 and 18: Table 4. Varieties tested in each h
Page 19 and 20: varieties. For example at Boxworth
Page 21 and 22: Table 7. Larvae per 100 grains on u
Page 23 and 24: Table 9. Numbers of larvae on chlor
Page 25 and 26: Table 11. Numbers of larvae on chlo
Page 27 and 28: Table 13 Untreated yields in 2002/0
Page 29 and 30: Table 15. Untreated yields (t/ha) i
Page 31 and 32: Table 14. Chlorpyrifos treated yiel
Page 33 and 34: analysed by ANOVA and by a Friedman
Page 35 and 36: To this end we would recommend:1. U
Page 37 and 38: Technical detail 2.Genetic Analysis
Page 39 and 40: Marker AnalysisA molecular genetic
Page 41 and 42: escape, it is not independent of ot
Page 43 and 44: Figure 1 : Levels of range blossom
Page 45 and 46: Figure 3 : Levels of orange blossom
Page 47 and 48: Figure 5: Marker analysis of a samp
Page 49 and 50: 2. MATERIALS & METHODS2.1. Synthesi
Page 51 and 52: GC column is simultaneously directe
Page 53 and 54: In 2003 field experiments were carr
Page 55 and 56: Table 2 Field Trapping Experiments
Page 57: 3.1.3. Field Trapping Experiments3.
Page 61 and 62: 3.1.3.3. 2004 Pheromone Trap Experi
Page 63 and 64: Fig. 13. Summary of Expt 2 20046005
Page 65 and 66: attractive (Fig. 16). In addition,
Page 67: 5. REFERENCESBirkett, M. A., Bruce,
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